Fish Community

Transcription

Fish Community

Prospect No. 3 Hydroelectric Project
FERC Project No. P-2337
Initial Study Report: Fish Community
May 2015
Prepared by:
Siskiyou Research Group
P.O. Box 2550
Cave Junction, OR 97523
For Public Review
SOUTH FORK ROGUE RIVER
FISH COMMUNITY INITIAL STUDY REPORT
PREPARED FOR:
PACIFICORP, HYDRO RESOURCES
MEDFORD, OREGON
PREPARED BY:
SISKIYOU RESEARCH GROUP
POST OFFICE BOX 2550
CAVE JUNCTION, OREGON 97523
(541) 592-6981
MAY 2015
South Fork Rogue River Fish Community Initial Study Report, May 2015
Table of Contents
1.0 Executive Summary…………………….…………………………………..…. 1
2.0 Introduction…………………………………………….……………………… 2
3.0 Project and Study Area……………………………..…………………………. 3
4.0 Methods………………………………………….…………………………….. 4
4.1 Visual Estimates – Mask and Snorkel Method………………………… 6
4.2 Electrofishing………………………………………………………….. 7
4.2.1 Sampling Procedure………………………………………….. 8
4.3 South Fork Impoundment………….………………………………….. 10
4.4 Pacific Lamprey Survey……………………………………………….. 10
5.0 Results………………………………………………….………………………. 10
5.1 Visual Estimates – Mask and Snorkel…………………………………. 10
5.1.1 Bypass Reach Summary (RM 4.4 to RM 10.58)…………….. 11
5.1.1.1 Snorkel Results…...……..………………………… 11
5.1.1.2 Fish Distribution……...……………………………. 12
5.1.2 Reach 1 (RM 4.4 to RM 6.1)………………………………… 13
5.1.2.1 Snorkel Results…………………………………….. 13
5.1.2.2 Fish Distribution………..…………………………. 13
5.1.3 Reach 2 (RM 6.1 to RM 7.7)………………………………… 16
5.1.3.1 Snorkel Results…………………………………..… 16
5.1.3.2 Fish Distribution…………………………………… 16
5.1.4 Reach 3 (RM 7.7 to RM 10.58)……………………………… 16
5.1.4.1 Snorkel Results…………………………………….. 17
5.1.4.2 Fish Distribution………..…………………………. 17
5.1.5 Reach 5 (RM 10.68 to 17.38)………………………………... 17
5.1.5.1 Snorkel Results……..…………………………...… 17
5.1.5.2 Fish Distribution…………………………………… 18
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Table of Contents
5.2 Electrofishing………………………………………………………….. 18
5.2.1 Reach 1 (RM 10.3)……………………………..……………. 19
5.2.1.1 Aquatic Habitat……………………………………. 19
5.2.1.2 Relative Abundance……..………………………… 19
5.2.1.3 Fish Distribution………...…………………………. 20
5.2.2 Reach 2 (RM 10.5)………………………………………….. 20
5.2.2.1 Aquatic Habitat…………………………………….. 20
5.2.2.2 Relative Abundance…………..…………………… 21
5.2.2.3 Fish Distribution…..………………………………. 21
5.2.3 Reach 3 (RM 10.6)……………………………..……………. 22
5.2.3.1 Aquatic Habitat…………………………………….. 22
5.2.3.2 Relative Abundance……..………………………… 22
5.2.3.3 Fish Distribution………………..…………………. 23
5.2.4 Reach 4 (Imnaha Creek)…………………………………….. 23
5.2.4.1 Aquatic Habitat…………………………………….. 23
5.2.4.2 Relative Abundance…..…………………………… 24
5.2.4.3 Fish Distribution……………..……………………. 24
5.3 South Fork Impoundment…………..…………………………………. 24
5.4 Pacific Lamprey Survey...…………………………………………….. 25
6.0 Discussion……………………………………………………………………… 25
7.0 References……………………………………………………………………… 27
Figures
Figure 1. Project Area…………………………………………………………….. 5
Figure 2. Summary of Fish species, size class, and abundance by habitat type
Bypass Reach…………………………………………………………... 12
Figure 3. Summary of Fish species, size class, and abundance by habitat type
Reach 1 through Reach 3, Fish Habitat Study…………………………. 14
Figure 4. Summary of Fish Density and CPUE for Fish Species and Reach
Segments for Fish Habitat Study and Electrofishing Study………………15
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Appendices
Appendix A: Fish Community Study Maps
Appendix B: Fish Calculation Tables for Fish Habitat Study Reaches (Reach 1 through
Reach 5).
Appendix C: Summary of Electrofishing Survey Data
Appendix D: Summary of Pacific Lamprey Survey Data.
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1.0 EXECUTIVE SUMMARY
Fish community studies were conducted on the South Fork Rogue River during August
2014 in support of the Federal Energy Regulatory Commission’s (FERC) Integrated
Licensing Process for re-licensing of PacifiCorp’s Prospect No. 3 Hydroelectric Project
(FERC Project No. P-2337).
Estimates of fish abundance by size-class, species assemblage, and species distribution
were made using visual estimation (mask and snorkel) and electrofishing sampling
methods. The two techniques were conducted in independent studies and were not
coordinated for evaluation of efficiency. Visual estimate data were correlated to mesoscale habitats (USDA 2014) using data collected in a 2014 Fish Habitat Study (Siskiyou
Research Group, 2015). Species abundance was reported as a function of area (fish/yd2)
derived from measured aquatic habitat data, and as a function of time (seconds) in a
capture per unit of effort (CPUE) calculation (n/sec).
Electrofishing was conducted opportunistically by spot sampling in fixed-reach segments,
and fish abundance was reported as CPUE. Captured fish were measured for mass and
length. Electrofishing efforts did not provide data on area sampled in the fixed-reach
segments so a derivation of fish density as a function of area was not possible. Rather,
aquatic habitat data collected during the 2014 Fish Habitat Study was used descriptively
to characterize the fixed-reach segments.
Study areas in the South Fork Rogue River were located (1) downstream of the South
Fork Dam to the confluence with the Middle Fork Rogue River, referred to as the bypass
reach (mapped River Mile (RM) 4.4 to RM 10.5), (2) upstream of the dam in the South
Fork Rogue River, (3) in Imnaha Creek, a large tributary that empties directly into the
South Fork Impoundment, and (4) within the South Fork Impoundment. Fish species
identified in the snorkel survey method include rainbow trout (Oncorhynchus mykiss),
cutthroat trout (O. clarkii), non-native eastern brook trout (Salvelinus fontinalis), and
sculpin (Cottus spp). Fish species identified in the electrofishing method include rainbow
trout and eastern brook trout.
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In the bypass reach, a fish community population of 979 salmonids was visually
estimated (snorkel survey method) in forty-two aquatic habitats sampling a total
measured area of 16,194 yd2 (13,540 m2), in a cumulative elapsed time of 212 minutes
(12,720 seconds), for a calculated fish density of 0.060 fish/yd2 (0.072 fish/m2), and a
CPUE of 0.077 fish/sec. Visual estimation of the fish community upstream of the South
Fork Impoundment was conducted between mapped RM 10.6 and RM 17.3 (measured
reach length of 6.83 miles). A fish population of 571 salmonids was visually estimated in
twenty-eight aquatic habitats sampling a total measured area of 15,726 yd2 (13,149 m2),
in an elapsed time of 123 minutes (7,380 seconds), for a fish density of 0.036 fish/yd2
(0.043 fish/m2), and a CPUE of 0.077 fish/sec.
Electrofishing was conducted in two 750-foot fixed-reach segments located in the bypass
reach, specifically (1) immediately downstream of the South Fork Dam, and (2)
downstream of the USGS stream gaging station located at mapped RM 10.3. Combined
data from the two fixed-reach segments located in the bypass reach reported the capture
of fifty-three salmonids in 2,429 seconds of electrofishing effort for a calculated CPUE of
0.022 fish/sec. One 600-foot fixed-reach segment was electrofished upstream of the
South Fork Impoundment and reported the capture of ten salmonids in 1,040 seconds for
a CPUE of 0.0096 fish/sec. A fourth fixed-reach segment was located in the lower 400foot section of Imnaha Creek and reported the capture of twenty-two salmonids in 830
seconds of electrofishing effort for a CPUE of 0.027 fish/sec.
Fish abundance was significantly greater as reported by the snorkel survey method, likely
as a result of a greater sample size and due to the limitations of operating a backpack
electrofisher in a deep complex channel in waters with low electrical conductance.
2.0 INTRODUCTION
PacifiCorp is preparing to file an application for new license with the Federal Energy
Regulatory Commission (FERC) for the Prospect No. 3 Hydroelectric Project (FERC
Project No. P-2337). FERC’s Integrated Licensing Process (ILP) was initiated on July 1,
2013 when PacifiCorp filed a Notice of Intent to File Application for New License (NOI)
2
and a Pre-Application Document (PAD). The ILP requires applicants to file relevant
resource management study plans with FERC (18 CFR §5.11 and 5.13).
ILP participants responded to the PAD, Scoping Document, and proposed Study Plans
with comments that identified resource issues and study requests. Specifically, Oregon
Department of Fish and Wildlife (ODFW), U.S. Fish and Wildlife Service, and FERC
requested aquatic habitat and fish community surveys to include a 6.0-mile section from
the confluence of the Middle Fork and South Fork Rogue River to the South Fork Dam,
and a 0.5-mile section immediately upstream of the impoundment.
PacifiCorp filed a revised Fish Community and Habitat Study Plan on April 28, 2014 to
accommodate study requests made by ILP participants. FERC approved the revised
Study Plan by order dated May 27, 2014. The Fish Habitat Study was performed in
August 2014, and the results are presented in the Fish Habitat Study Report (Siskiyou
Research Group, 2015), which will be filed with FERC, along with the other required
Study Reports, in May 2015. The Fish Community Study was also conducted in August
2014, and the results are presented in this Study Report.
3.0 PROJECT AND STUDY AREA
The project is located in southwestern Oregon on the South Fork Rogue River southeast
of the unincorporated community of Prospect in northeast Jackson County, Oregon
(Figure 1). The project is within the South Fork Rogue River watershed on the western
slope of the High Cascade Mountains as described in the South Fork Rogue River 2014
Level II Stream Survey Report (Fish Habitat Study Report, Siskiyou Research Group,
2015). The project includes private land owned by PacifiCorp and federal lands managed
by the U.S. Department of Agriculture, Forest Service (USFS) as the Rogue RiverSiskiyou National Forest (RR-SNF).
The Study Area includes five study reaches as defined in the Study Plan. Two of the
study reaches (and three of the reaches identified in the Fish Habitat Study) are located in
the bypass reach section, one study reach is located in the South Fork Impoundment, one
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study reach (and one reach identified in the Fish Habitat Study) is located immediately
upstream of the South Fork Impoundment, and one study reach is located in lower
Imnaha Creek. The proposed study plan sites were selected based on two related
attributes. First, all but one of the proposed sites offers historical data from previous
surveys conducted by PacifiCorp in 1985. Second, the proposed sites represent some of
the only accessible locations in the Project Vicinity for the types of equipment to be used.
Although the exact locations of the reaches were determined in the field, they were
positioned to incorporate the following locations:
(1)
South Fork bypass reach, RM 7.0, upstream of Prospect-Butte Falls Highway
crossing;
(2)
South Fork bypass reach, RM 10.25, between USGS gage and diversion dam;
(3)
South Fork Rogue River, RM 10.5, in the impoundment;
(4)
South Fork Rogue River, RM 10.6, upstream of the confluence with the
impoundment; and
(5)
Imnaha Creek, RM 0.0, upstream of the confluence with the impoundment.
Land ownership adjacent to the Study Area reaches includes, from downstream to
upstream, a mosaic of private timber company, PacifiCorp, and USFS lands.
The Study Area as defined in the Study Plan was augmented with fish community data
gathered during the Fish Habitat Study within the South Fork Rogue from RM 4.4 to RM
17.3 as described in the Mask-and-Snorkel methods and results sections presented below.
4.0 METHODS
Three methods were used to provide data on the fish community of the South Fork Rogue
River and Imnaha Creek within the Study Area. The three methods provided information
on fish species composition, fish abundance by size-class, and fish species distribution.
The first method was visual estimates using mask and snorkel gear conducted
concurrently with the Fish Habitat Study in August 2014, and in the South Fork
impoundment in April 2015.
4
Figure 1. Project Area
5
The second method was a more focused sampling effort using a Halltech HT-2000
backpack electrofisher in a fixed-reach approach following standardized sampling
methods for wadeable streams (US Environmental Protection Agency, 2009). The third
sampling method used was angling with hook and line of the South Fork Impoundment.
Appendix A contains maps that depict the locations of the fixed-reach sampling
segments of the electrofishing effort, and the reach segments identified in the Fish
Habitat Study (1) within the bypass reach of the South Fork Rogue River, (2) upstream of
the South Fork Impoundment, and (3) in Imnaha Creek (2002).
4.1
Visual Estimates - Mask and Snorkel Method
The Fish Habitat Study and Fish Community Study were conducted concurrently by
Siskiyou Research Group (SRG) in August 2014 on a six-mile section of the South Fork
Rogue River (bypass reach) from the confluence with the Middle Fork Rogue River (RM
4.4) to the South Fork Dam (RM 10.5), and on a 6.8-mile section beginning where the
South Fork Rogue River enters the South Fork Impoundment (RM 10.6) to the
confluence with Big Ben Creek (RM 17.3). The Fish Community Study was conducted
by direct observation of fish using mask and snorkel gear. Sampling frequency required
the snorkel survey of twenty percent of pool (slow water) habitats and ten percent of
rapid (fast water) habitats - or every fifth pool encountered and every tenth rapid
encountered, as identified during the Fish Habitat Study (Stream Inventory Handbook,
Region 6, 2014). Data collected at each snorkeled unit included (1) type and dimensions
of snorkeled habitat, (2) time spent snorkeling, (3) identification of fish to species, (4)
estimated number of fish per species, and (5) estimated size-class of each fish counted.
Three size-class categories were represented in 100-millimeter increments (i.e. 0 – 100
mm, 100 mm – 200 mm, 200 mm – 300 mm1). Snorkeling time was measured for
calculating catch per unit effort (CPUE), and habitat dimensions of each snorkeled unit
yielded a relative abundance expressed as fish per unit area (fish/yd2).
1
Occasionally a 300 mm – 400 mm size class fish was reported during the surveys but was calculated in
the size-class > 3 (> 300 mm).
6
The mask and snorkel surveys were conducted by a two-person crew that included a
snorkeler (observer), and a data recorder who collected habitat dimensions, described
riparian vegetation, measured stream temperature, timed the snorkeling effort, and
recorded the snorkeling results. The snorkeler searched the entire habitat in striptransects and recorded fish counts as estimates of the total number of fish residing in the
sampled habitat. Aquatic habitat dimensions were collected for every habitat, not just the
snorkeled habitats, and were used to calculate total aquatic habitat area for the reach, total
area snorkeled for pools and rapids, and percent of pool habitat and percent of rapid
habitat that was snorkeled in the reach. The results of the mask and snorkel survey
yielded fish species composition, fish distribution, and fish abundance by size-class
(estimated size-class based on total length). Calculation tables used to summarize data
and calculate fish densities are presented in Appendix B.
4.2
Electrofishing
The second component of the Fish Community Study was conducted by PacifiCorp on
three reaches of the South Fork Rogue River and one reach of Imnaha Creek following
guidelines outlined in the standardized sampling methods for wadeable streams (US
Environmental Protection Agency, 2009). A fixed-reach backpack electrofishing
approach was used to sample the fish assemblage in a total of four fixed-reach segments.
The fixed-reach study sites selected represent some of the only locations accessible in the
Project Area for the type of equipment used (Halltech HT-2000 backpack electrofisher).
The fixed-reach segments of the electrofishing survey are depicted on survey maps in
Appendix A and were located in the following areas:
Reach 1 - South Fork Rogue River bypass reach beginning 750 feet downstream of
USGS stream gaging station and ending at USGS stream gaging station pool (a subset of
Reach 3 of the Fish Habitat Study).
Reach 2 – South Fork Rogue River bypass reach beginning 750 feet downstream of
South Fork Dam and ending at the South Fork Dam (a subset of Reach 3 of the Fish
Habitat Study).
7
Reach 3 – South Fork Rogue River beginning at the point where the South Fork Rogue
River enters the South Fork Impoundment and extending upstream 600 feet (a subset of
Reach 5 of the Fish Habitat Study).
Reach 4 – Imnaha Creek beginning at the point where Imnaha Creek enters the South
Fork Impoundment and extending upstream 450 feet (a subset of Reach 1 of Imnaha
Creek from a 2002 Fish Habitat Study conducted by SRG).
The fixed-reach study areas of the South Fork Rogue River (Reach 1 – Reach 3) were
delineated per EPA conventions for “large wadeable streams,” defined by a wetted
channel width greater than or equal to 12.5 meters (41 feet2) (EPA, 2009). The fixedreach study area on Imnaha Creek was sampled per EPA conventions for “small
wadeable streams,” in which the wetted channel width is less than 12.5 meters.
4.2.1
Sampling Procedure
Fixed-reach electrofishing was performed by a three-person crew wading upstream in
each study reach. The crew included one individual who operated the electrofisher; a
second crew member captured stunned fish with a dip net; and a third individual who
transported captured fish to a live well, estimated the number and species of fish missed
by the netter, and handles fish as needed. A second dip net was used by the operator of
the electrofisher, or third crew member, but care was taken to ensure that only a single
net was capturing fish at any time, per EPA conventions to ensure an accurate calculation
of CPUE.
In Imnaha Creek (Reach 4), the sampling crew entered the stream at the bottom of the
study reach and slowly worked upstream to the top of the reach, and to the extent
practical, the entire stream width was sampled, per EPA convention for “small wadeable
streams”(2009).
2
The aquatic habitat inventory conducted by SRG (August 2014) calculated an average fast water width of
35 feet (10.67 meters) and an average slow water width of 32 feet (9.8 meters) for Reach 3 (Fish Habitat
Study, 2015), a subset of the South Fork Rogue bypass reach.
8
The electrofishing survey conducted by PacifiCorp in August 2014 was unable to follow
EPA’s subsampling procedures for large wadeable streams outlined in the Study Plan due
to difficult access and complex channel conditions. The South Fork Rogue River within
the Study Area was characterized by a large, deep, boulder-dominated, complex channel,
which prohibited the safe use of a backpack electrofisher in many areas. Crossing the
channel to perform an alternating transect subsample in the fixed-reaches was unsafe in
some locations. PacifiCorp performed spot electrofishing sampling in the fixed-reach
areas where surveyors could safely enter and wade the stream. This method allowed for
the calculation of CPUE as a function of time, but did not allow for the calculation of
CPUE as a function of area sampled. Fixed-reaches were sampled for a range of 830
seconds (Reach 4) to 1,310 seconds (Reach 1) as recorded by the electrofisher.
At least three times during the sampling of Reach 4 (Imnaha Creek), and at the end of
each spot sampling (Reach 1 through Reach 3) on the South Fork Rogue River sites, the
crew paused to identify and count fish captured. Data collected and reported included
fish species identification and number of individuals, length of fixed-reach sampling
section, length of time electrofisher was activated for each fixed-reach sampling effort,
fork length and weight of captured individuals, the identification and reporting of fish
mortality as a result of the electrofishing effort, settings used on electrofisher, specific
conductance of sampled waters, and the identification and enumeration of incidental
species captured during the sampling effort (Appendix C).
The fixed-reach sampling approach uses catch per unit of effort (CPUE) as a metric of
relative abundance. This was calculated as a function of time spent actively
electrofishing (e.g. fish captured per time interval in seconds) and was determined by a
timer on the electrofisher that records the length of time an electric field is applied to the
water.
Supplemental data was collected for each reach by SRG during the August 2014 Fish
Habitat Study to contribute to the fish community analysis. The data provided by SRG
specific to PacifiCorp’s fixed-reach study areas include habitat types and dimensions, any
9
complex habitat features present, the dominant types of channel substrate, a qualitative
estimate of the amount of pocket pool habitat present in fast water, aquatic habitat
maximum depths, and dominant cover type offered to fish. This information is presented
in the electrofishing results.
4.3
South Fork Impoundment
A fifth area, identified as the South Fork Impoundment, was sampled by angling with
hook and line by PacifiCorp resource specialists in July 2014 and with mask and snorkel
gear by SRG in April 2015. A team of two snorkelers accessed the impoundment at the
dam and worked upstream along each bank to the top of the impoundment, then drifted
downstream searching the main body of the impoundment. Each snorkeler spent
approximately twenty-five minutes conducting visual searches. Observed fish were
identified to species, counted, and categorized into size classes. Snorkelers conducted
observations in the morning (before noon) and repeated the survey in the afternoon. The
snorkel survey was performed during low flow conditions, when relatively low water
velocities provided the most suitable snorkeling conditions.
4.4
Pacific Lamprey Survey
The Cow Creek Tribe of the Umpqua Indians conducted two days of Pacific lamprey
(Lampetra tridentata) surveys in the Project Area (bypass reach) following the Umpqua
Basin Lamprey Protocol (USGS, Forest and Rangeland Ecosystem Science Center,
2013).
5.0 RESULTS
5.1
Visual Estimates - Mask and Snorkel
The mask and snorkel aquatic biota survey was conducted concurrently with the Fish
Habitat Study on the South Fork Rogue River. The results of the mask and snorkel
survey work are being reported at the bypass reach scale and at the Fish Habitat Study
reach scale.
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5.1.1 Bypass Reach Summary
The bypass reach, as identified in the Study Plan, extends from the confluence of the
Middle Fork and South Fork Rogue River (RM 4.4) to the South Fork Rogue River Dam
(RM 10.53), and is the section of river directly affected by the Project. The Fish Habitat
Study broke this section into three reaches based on similarities in canyon morphology,
channel substrates, stream gradient, and stream flow. The reach break locations are
represented on survey maps found in Appendix A.
5.1.1.1 Snorkel Results
The results of the mask and snorkel survey at the bypass reach scale are simply a
summation of the data collected at the Fish Habitat Study reach scale. At the bypass
reach scale 979 salmonid fish were observed in forty-two aquatic habitats comprising an
area of 16,194 yd2 (13,540 m2) for a fish density of 0.060 fish/yd2 (0.072 fish/m2).
Thirty-one slow water habitats (pools) and eleven fast water habitats4 (rapids and riffles)
were snorkeled sampling an area 11,074 yd2 (9,259 m2) and 5,120 yd2 (4,281 m2),
respectively. Fish species identified include: rainbow trout (Oncorhynchus mykiss),
cutthroat trout (O. clarkii), non-native eastern brook trout (Salvelinus fontinalis), and
sculpin (Cottus spp). Figure 2 details the results of the snorkel estimates of fish
abundance by size-class and habitat type in the bypass reach.
In addition to relative abundance expressed as a function of area, snorkel surveys were
coarsely timed so catch per unit of effort (CPUE) could be calculated temporally to
compare with results derived from the electrofishing effort conducted by PacifiCorp. The
timing of the individual snorkel efforts was to the nearest minute. In the bypass reach a
total of 979 fish were observed in 212 minutes (12,720 sec) of snorkel effort for a CPUE
of 0.077 (fish/sec).
3
River Mile (RM) distances are estimated from map interpretation, all other distances, heights, widths, or
areas reported are field measured.
4
The terms slow water habitat and fast water habitat will be used interchangeably with pools and
rapids/riffles, respectively, throughout this report.
11
Figure 2. Summary of fish species, size-class, and abundance by habitat type,
South Fork Rogue River 2014 Snorkel Results Bypass Reach (RM 4.4 – RM 10.5).
Reach Habitat
ID
Type
% of
Species
Area
Code
Sampled
Tally by Size Class
1
2
>3
2
Salmonid Density (fish/yd )
Total
Size
Salmonids By Habitat ONMY ONCL SAFO Size
Total
Type
Class 1 Class ≥2
ONMY 124 580 51
839
0.760
ONCL
0
24
21
Bypass
SAFO
2
29
8
0.055 0.003 0.002 0.010 0.050 0.060
Reach
ONMY
44
86
8
FW
6
140
0.027
ONCL
0
0
1
SAFO
0
0
1
Salmonid Size Class Totals 170 719 90
979
0.060
Size Class Definition: 1 = 0 to 100mm, 2 = 100mm to 200mm, 3 ≥200mm
Codes to abbreviations: ONMY=Oncorhynchus mykiss; ONCL= O. clarkii; SAFO=Salvelinus fontinalis; SW=slow water (pools);
FW=fast water (rapids)
SW
22
5.1.1.2 Fish Distribution
Snorkel survey results indicate rainbow trout and brook trout were found throughout the
bypass reach, and cutthroat trout were distributed in the lower 3.4 miles of the bypass
reach. Likewise, the highest fish densities and largest fish were also correlated to the
lower 3.4-mile section of the bypass reach where the Fish Habitat Study Report described
large, complex habitats with a stream flow that was augmented by ground water input.
The snorkel survey results also suggest a strong preference for pool habitat (Figure 2) for
the three salmonid species observed in South Fork Rogue River.
The Fish Habitat Study identified three reaches in the South Fork bypass reach from the
confluence of the Middle Fork and South Fork Rogue River to the South Fork Dam, and
one reach located immediately upstream of the South Fork Impoundment to the
confluence of Big Ben Creek. The Fish Habitat Study reach locations in the South Fork
bypass section located below the dam are described as follows:
Reach 1 – Confluence with the Middle Fork Rogue River (RM 4.4) to confluence with
Buck Creek (RM 6.1).
Reach 2 – Confluence with Buck Creek (RM 6.1) to apex in the river bend where the
South Fork Rogue River turns north (upstream perspective) in section 14 (RM 7.7).
Reach 3 – Apex of river bend in section 14 (RM 7.7) to South Fork Dam (RM 10.5)
12
Aquatic habitat data is presented under separate cover as the South Fork Rogue River
2014 Level II Stream Survey Report (Fish Habitat Study Report; Siskiyou Research
Group, 2015).
5.1.2 Reach 1
In Reach 1, a total of 351 salmonids were observed in ten aquatic habitats comprising a
total area of 5,529 yd2 (4,623 m2) for a fish density of 0.063 fish/yd2 (0.076 fish/m2).
Seven slow water units and three fast water units were snorkeled in Reach 1, sampling an
area of 3,977 yd2 (3,325 m2) and 1, 552 yd2 (1,298 m2), respectively. In the seven slow
water habitats, 322 salmonids were observed for a fish density of 0.081 fish/yd2 (0.097
fish/m2). In the three fast water habitats, twenty-nine salmonids were observed for a fish
density of 0.019 fish/yd2 (0.022 fish/m2). Figure 3 details the results of the snorkel
estimates for fish abundance by size-class, species, and habitat type in the four reaches
identified in the Fish Habitat Study. In Reach 1, a total of 351 salmonid fish were
counted in an elapsed time of approximately seventy minutes (4,200 seconds) for a CPUE
of 0.084 fish/sec. Figure 4 summarizes fish density and CPUE results by species and
reach for the snorkel survey and electrofishing survey.
Rainbow trout, cutthroat trout, and brook trout were observed throughout Reach 1 in the
second highest fish densities calculated in the study. Fish showed a strong preference for
pool habitat (0.081 fish/yd2) compared to riffle habitat (0.019 fish/yd2).
13
Figure 3. Summary of Fish Species, Size Class, and Abundance by Habitat Type, South Fork Rogue River 2014 Stream Survey Snorkel
Results.
Reach Habitat
ID
Type
2
Tally by Size Class
% of
Salmonid Density (fish/yd )
Species
Total
Area
By Habitat
Size
Size
Code
Salmonids
1
2
>3
ONMY
ONCL
SAFO
Total
Sampled
Type
Class 1 Class ≥2
ONMY
28
229 25
322
ONCL
0
16
18
1
SAFO
0
5
1
FW
7
ONMY
6
20
3
29
Salmonid Size Class Totals
34
270 47
351
ONMY
28
194 10
SW
16
247
ONCL
0
8
3
SAFO
0
2
2
2
ONMY
14
38
3
FW
7
57
ONLC
0
0
1
SAFO
0
0
1
42
242 20
304
ONMY
68
157 16
SW
24
270
SAFO
2
22
5
3
FW
4
ONMY
24
28
2
54
94
207 23
324
ONMY
157
250 25
445
SW
19
SAFO
3
10
0
ONMY
53
66
4
5
FW
6
126
ONCL
0
1
0
SAFO
0
1
1
Salmonid Size Class Totals 213
328 30
571
Size Class Definition: 1 = 0 to 100mm, 2 = 100mm to 200mm, 3 = >200mm
SW
25
0.081
0.056
0.006
0.001
0.006
0.057
0.063
0.071
0.003
0.001
0.010
0.064
0.075
0.045
0.000
0.004
0.014
0.035
0.049
0.053
0.000
0.001
0.014
0.023
0.036
0.019
0.100
0.036
0.058
0.027
0.050
0.018
ONMY=Oncorhynchus mykiss; ONCL= O. clarkii; SAFO=Salvelinus fontinalis; SW=slow water (pools); FW=fast water (rapids)
14
Figure 4. Summary of fish density and CPUE calculated for species and reach segments for the snorkel survey and electrofishing survey
efforts.
Bypass Reach (RM 4.4 to RM 10.5)
Above Reservoir
Reach 2
Reach 3
Bypass Reach
Reach 5
Snorkel
RM 6.1 - RM 7.7 RM 7.7 - RM 10.5
Total
RM 10.6 - RM 17.3
Survey
ONMY
0.071
0.045
0.055
0.035
CPUE
ONCL
0.003
0.000
0.003
0.000
(fish/yd2)
SAFO
0.001
0.004
0.002
0.001
TOTAL
0.075
0.049
0.060
0.036
Above Reservoir
Reach 1
Reach 2
Reach 3
Bypass Reach
Reach 5
Fish Species
Snorkel
RM 4.4 - RM 6.1 RM 6.1 - RM 7.7 RM 7.7 - RM 10.5
Total
RM 10.6 - RM 17.4
Survey
ONMY
0.074
0.098
0.053
0.07
0.075
CPUE
ONCL
0.008
0.004
0.000
0.004
0.000
(fish/sec)
SAFO
0.001
0.002
0.005
0.003
0.002
TOTAL
0.084
0.103
0.058
0.077
0.077
Above Reservoir
Fish Species
Reach 1
Reach 2
Bypass Reach
Reach 3
ElectroRM
10.33
RM
10.58
Total
RM
10.69
fishing
CPUE
ONMY
0.015
0.023
0.019
0.007
(fish/sec)
SAFO
0.002
0.004
0.003
0.003
TOTAL
0.018
0.027
0.022
0.010
ONMY=Oncorhynchus mykiss; ONCL= O. clarkii; SAFO=Salvelinus fontinalis; RM=River Mile.
Fish Species
Reach 1
RM 4.4 - RM 6.1
0.056
0.006
0.001
0.063
15
Imnaha Creek
Reach 1
RM 0.0 - RM 1.74
0.011
0.018
0.012
0.041
Imnaha Creek
Reach 1
RM 0.0 - RM 1.74
N/A
N/A
N/A
N/A
Imnaha Creek
Reach 4
RM 0.0
0.011
0.016
0.027
5.1.3 Reach 2
In Reach 2, a total of 304 salmonids were observed in eleven aquatic habitats comprising
a total area of 4,064 yd2 (3,398 m2) for a fish density of 0.075 fish/yd2 (0.089 fish/m2).
Eight slow water units and three fast water units were snorkeled in Reach 2, sampling an
area of 2,468 yd2 (2,064 m2) and 1, 596 yd2 (1,335 m2), respectively. In the eight slow
water habitats, 247 salmonids were observed for a fish density of 0.100 fish/yd2 (0.120
fish/m2), and in the three fast water habitats, fifty-seven salmonids were observed for a
fish density of 0.036 fish/yd2 (0.043 fish/m2) (Figure 3). In Reach 2 a total of 304
salmonid fish were counted in an elapsed time of forty-nine minutes (2,940 seconds) for a
CPUE of 0.103 fish/sec.
Rainbow trout, cutthroat trout, and brook trout were observed throughout Reach 2.
Reach 2 contained the highest fish densities and CPUE in the snorkel survey of South
Fork Rogue River. Snorkel survey data suggests higher fish densities in the lower and
middle portion of Reach 2, where stream flow was augmented by ground water inflow.
Similar to Reach 1, fish in Reach 2 showed a strong preference for pool habitat (0.100
fish/yd2) compared to riffle habitat (0.036 fish/yd2).
5.1.4 Reach 3
Stream flow was noticeably reduced in Reach 3, when compared to Reach 2, as a result
of water diversion at the South Fork Dam and a lack of large tributaries or ground water
inflow in this section. A 1986 stream flow study reported stream discharge from the
South Fork Dam downstream approximately 2.5 miles remains consistent with no large
tributary or springs contributions (Cambell-Craven, 1986). The study concluded that
stream discharge measured at the United States Geological Survey (USGS) stream gaging
station located approximately 0.25 miles downstream of the South Fork Dam is
representative of the stream flow in the 2.5-mile section below the dam. At the time of
the Fish Habitat Study and snorkel survey work, stream flow in this section, as measured
at the USGS gaging station, was 14.5 cubic feet per second (cfs).
16
In Reach 3, a total of 324 salmonids were observed in twenty-one aquatic habitats
comprising a total area of 6,601 yd2 (5,519 m2) for a fish density of 0.049 fish/yd2 (0.059
fish/m2). Sixteen slow water units and five fast water units were snorkeled in Reach 3,
sampling an area of 4,630 yd2 (3,871 m2) and 1,971 yd2 (1,648 m2), respectively. In the
sixteen slow water habitats, 270 salmonids were observed for a fish density of 0.058
fish/yd2 (0.070 fish/m2), and in the three fast water habitats, fifty-four salmonids were
observed for a fish density of 0.027 fish/yd2 (0.033 fish/m2) (Figure 3). In Reach 3 a
total of 324 salmonid fish were counted in an elapsed time of ninety-three minutes (5,580
seconds) for a CPUE of 0.058 fish/sec.
Rainbow trout and brook trout were observed throughout Reach 3. No cutthroat trout
were observed in Reach 3. Reach 3 contained the lowest fish densities and CPUE in the
bypass reach section of the South Fork Rogue River, but did not have the lowest fish
density in the snorkel survey of South Fork Rogue River. The lowest fish densities
observed occurred in Reach 5, located upstream of the South Fork Dam. Snorkel survey
data suggests higher fish densities in the lower and middle portion of Reach 3, and the
lowest fish density in upper Reach 3, with the exception of the pool located directly
below the South Fork Dam at the entrance to the fish ladder. A large number of fish were
observed in this habitat, including most of the brook trout that were reported in Reach 3.
Similar to the previous reaches, fish in Reach 3 showed a strong preference for pool
habitat (0.058 fish/yd2) compared to riffle habitat (0.027 fish/yd2).
5.1.5 Reach 5
In Reach 5, a total of 571 salmonids were observed in twenty-eight aquatic habitats
comprising a total area of 15,726 yd2 (13,149 m2) for a fish density of 0.036 fish/yd2
(0.043 fish/m2). Nineteen slow water units and nine fast water units were snorkeled in
Reach 5, sampling an area of 8,912 yd2 (7,452 m2) and 6,814 yd2 (5,697 m2),
respectively. In the nineteen slow water habitats, 445 salmonids were observed for a fish
17
density of 0.050 fish/yd2 (0.060 fish/m2), and in the nine fast water habitats, 126
salmonids were observed for a fish density of 0.018 fish/yd2 (0.022 fish/m2) (Figure 3).
In Reach 5 a total of 571 salmonid fish were counted in an elapsed time of 123 minutes
(7,380 seconds) for a CPUE of 0.077 fish/sec.
Rainbow trout and brook trout were observed throughout Reach 5. One cutthroat trout
was reported and field notes indicate this fish identification was unconfirmed and likely
misidentified. Reach 5 contained the lowest fish densities as calculated for area, but not
as calculated for CPUE as a function of time. Snorkel survey data suggests the lower fish
densities were observed in lower Reach 5, near the South Fork Impoundment, and the
highest fish densities of Reach 5 were found in the middle and upper sections. Reach 5
contained high quality aquatic habitat attributes with respect to stream flow, amount of
instream large woody material (LWM), quality of the riparian habitat, and the amount
and distribution of suitable spawning habitat. Fish distribution in Reach 5 showed a
strong preference for pool habitat with a calculated density of 0.050 fish/yd2 (0.060
fish/m2), compared to 0.018 fish/yd2 (0.022 fish/m2) calculated for fast water habitat.
5.2
Electrofishing
PacifiCorp conducted four fixed-reach sampling efforts within the Study Area on August
18 and 19, 2014 to contribute information to the species assemblage, distribution, and
abundance of fish species in Project-affected waters of the South Fork Rogue River. The
results of the electrofishing effort are reported at the fixed-reach scale, and CPUE is
reported as a function of timed sampling effort and not area sampled. Stream turbidity
was classified as low (high water clarity), and specific conductance was low, measured to
be 0.06 micro siemens per centimeter (μS/cm). Electrofishing was conducted in spot
sampling where wading with a backpack electrofisher was safe. Deep aquatic habitats
and low specific conductance reduced electrofishing efficiency. The electrofisher used
was a Halltech HT-2000 set at 60 hertz and 550 volts.
18
5.2.1 Reach 1
Reach 1 was identified as an estimated 750-foot segment located in the bypass reach of
the South Fork Rogue River ending at the upstream end of the grade-controlled weir pool
at the USGS gaging station (RM 10.3, 042o 42’ 32.06”, 122o 23’ 34.04”W, NAD 83).
Recent reports by PacifiCorp staff indicate this grade-control weir structure was
displaced during a high flow event in December 2014.
5.2.1.1 Aquatic Habitat
Fish Habitat Study data correlated to PacifiCorp’s field-delineated Reach 1 includes one
rapid habitat and one pool habitat for a total measured fixed-reach length of 571 feet.
The one rapid habitat located in the fixed-reach segment was 465 feet long, with an
average width of thirty-two feet, an average depth of 1.9 feet, and a maximum depth of
3.1 feet. This rapid was boulder-dominated, complex, approximately three to four
percent gradient, and contained a large percentage of pocket pool habitat found in eddy
water downstream of emergent boulders. One large class LWM was documented in this
habitat, but no debris jams or side channels were noted. The pool located in Reach 1 was
identified in the Fish Habitat Study as the grade-controlled dam pool located at the USGS
stream gaging station. This pool (SO 283, SDDD 145, Photo 58, Fish Habitat study) was
106 feet long, forty-one feet wide, and contained a maximum pool depth of 4.3 feet. Pool
substrate, determined by visual estimates, was dominated by large cobble and small
boulders. Photos 56 through 58 of the Fish Habitat Study Report depict typical channel
morphology in this section of South Fork Rogue River.
5.2.1.2 Relative Abundance
Reach 1 was electrofished for 1,310 seconds and resulted in the capture of twenty
rainbow trout (87%) and three brook trout (13%) for a CPUE of 0.015 fish/sec and 0.002
fish/sec, respectively. Total CPUE for Reach 1 is 0.018 fish/sec. Rainbow trout ranged
in weight from less than one gram (n=3) to forty-five grams with a median weight of 9.5
grams and an average weight of 12.8 grams. Rainbow trout measured fork lengths
ranged from a minimum of 42 millimeters (mm) to a maximum of 151 mm, with a
median fork length of 96 mm. The three brook trout captured were measured to be
19
thirteen grams, twenty-three grams, and fifty-one grams. The average weight of brook
trout captured in Reach 1 was twenty-nine grams. Brook trout measured fork lengths
were 114 mm, 134 mm, and 167 mm, and median fork length was 134 mm. Incidental
species captured during the electrofishing effort included one tailed frog (Ascaphus truei)
tadpole.
Rainbow trout and brook trout were identified in PacifiCorp’s Reach 1. Likewise the
snorkel survey effort in this section found rainbow trout and brook trout. One pool
habitat (USGS stream gaging pool, SO 283, SDDD 145, photo 58, Fish Habitat Study)
was snorkeled in this fixed-reach segment by SRG and identified three size-class 2 (100
mm - 200 mm) and four size-class 3 (200 mm - 300 mm) rainbow trout in a six-minute
(360 seconds) snorkel effort for a CPUE of 0.019 fish/sec, which was comparable to the
calculated CPUE for the electrofishing effort in PacifiCorp’s Reach 1. Fish density for
this pool based on the pool area of 483 yd2 (404 m2) was 0.014 fish/yd2 (0.017 fish/m2).
5.2.2 Reach 2
Reach 2 was identified as an estimated 750-foot segment located downstream of the
South Fork Dam that sampled to the plunge pool located immediately downstream of the
dam. This plunge pool habitat was not electrofished due to its depth (6.3 feet max depth
determined in the Fish Habitat Study).
Fish Habitat Study data was correlated to PacifiCorp’s Reach 2 and included six rapids
and six pools for a total measured fixed-reach length of 1,046 feet. Total fast water
length was 599 feet (range: forty-five feet to 206 feet), average fast water length was 100
feet, average fast water width was thirty feet, and average fast water maximum depth was
2.2 feet. Rapid habitat was boulder- and cobble-dominated, deep channeled, and
contained a high percentage of pocket pool habitat. No instream LWM, debris jams, or
side channels were noted in PacifiCorp’s Reach 2. Six pools were located in Reach 2
with a total pool length of 447 feet (range: thirty-five feet to 104 feet), an average pool
20
length of seventy-five feet, an average pool width of twenty-eight feet, and an average
maximum pool depth of 3.1 feet. Pool habitat was relatively large and moderately deep
in this section (Photo 59, Fish Habitat Study Report). Stream flow was measured and
recorded at the USGS gaging station to be a minimum of 12 cfs that spiked daily to 25 cfs
(http://waterdata.usgs.gov, USGS 14332000 South Fork Rogue River near Prospect,
Oregon).
Reach 2 was electrofished for 1,119 seconds and resulted in the capture of twenty-six
rainbow trout (87%) and four brook trout (13%) for a CPUE of 0.023 fish/sec and 0.004
fish/sec, respectively. Total salmonid CPUE for Reach 2 is 0.027 fish/sec. Rainbow
trout ranged in weight from less than one gram (n=2) to sixty grams with a median
weight of 8.5 grams and average weight of 17.3 grams. Rainbow trout measured fork
lengths ranged from a minimum of 31 mm to a maximum of 185 mm, with a median fork
length of 96 mm. Four brook trout measured weights were eighty-three grams, 117
grams, nine grams, and thirty grams. Brook trout measured fork lengths were 206 mm,
121 mm, 96 mm, and 146 mm. Median brook trout fork length was 133 mm. The
snorkel survey sampled one pool habitat (SO 291, SSMC 150, Photo 59) in this fixedreach segment and identified three size-class 2 and one size-class 3 rainbow trout, and
five size-class 2 brook trout in a four-minute (240 seconds) snorkel effort for a CPUE of
0.038 fish/sec, which was greater than but comparable to the calculated CPUE for the
electrofishing effort in Reach 2.
Rainbow trout and brook trout were identified in PacifiCorp’s Reach 2. PacifiCorp was
unable to effectively electrofish the plunge pool located at the base of the South Fork
Dam due to habitat depth, however the snorkel survey sampled this habitat and observed
twenty-two size-class 2 and six size-class 3 rainbow trout; and fifteen size-class 2 and
five size-class 3 brook trout in a six-minute (360 second) snorkel effort for a CPUE of
0.133 fish/sec. The high CPUE suggests fish have accumulated in this habitat located at
the base of the dam, which is also the entrance pool to the fish ladder. The fish ladder
21
was not snorkel surveyed. In addition to the reported fish captured by PacifiCorp’s
electrofishing effort, four tailed frogs, and four adult and one juvenile Pacific giant
salamanders (Dicamptodon tenebrosus) were also reported.
5.2.3 Reach 3
Reach 3 was identified as an estimated 600-foot segment located immediately upstream
of the South Fork Impoundment. The Fish Habitat Study reported a 637-foot rapid
habitat located immediately upstream of the impoundment.
Fish habitat survey data correlated to PacifiCorp’s Reach 3 consisted of one rapid and no
pool habitat. The rapid was measured 637 feet in length, with an average width of fiftytwo feet, a maximum depth of 5.3 feet, and an average depth of 2.4 feet. This rapid was
large, deep-channeled, boulder-dominated, contained a large amount of pocket pool
habitat, and the lower portion was influenced by the South Fork Impoundment (Photo 62,
Fish Habitat Study report). Stream flow was not measured but was estimated to be
significantly greater than the stream flow in the section directly downstream of the South
Fork Dam. This rapid did not contain any instream LWM, although it was the site of a
large wood jam that was mobilized in February 2014.
Reach 3 was electrofished for 1,040 seconds and resulted in the capture of seven rainbow
trout (70%) and three brook trout (10%) for a CPUE of 0.007 fish/sec and 0.003 fish/sec,
respectively. Total salmonid CPUE for Reach 3 is 0.010 fish/sec. Rainbow trout ranged
in weight from one gram to twenty-nine grams with a median weight of five grams and
an average weight of eleven grams. Rainbow trout measured fork lengths ranged from a
minimum of 52 mm to a maximum of 147 mm, with a median fork length of 76 mm.
Three brook trout measured weights were twenty-eight grams, nine grams, and twentyone grams. Brook trout measured fork lengths were 137 mm, 99 mm, and 131 mm.
22
Rainbow trout and brook trout were identified in PacifiCorp’s Reach 3 in very low
densities. The large, deep, complex habitat with robust stream flow likely reduced
sampling effectiveness. Snorkel survey fish distribution data for Reach 5 of the Fish
Habitat Study, of which PacifiCorp’s Reach 3 is a small subset, showed lower fish
densities in the lower 1.4 miles of the 6.83-mile reach, when compared to the middle and
upper sections. PacifiCorp reported one rainbow trout mortality as a result of the
electrofishing effort in this reach. No additional species were reported in Reach 3.
5.2.4
Reach 4 (Imnaha Creek)
Reach 4 was identified by PacifiCorp as an estimated 450-foot segment of Imnaha Creek
located immediately upstream of the South Fork Impoundment. In 2002 SRG conducted
a Fish Habitat Study and aquatic biota survey (mask and snorkel) on Imnaha Creek and
used this data to correlate to the fixed-reach segment sampled by PacifiCorp.
The first 550 feet of the 2002 Fish Habitat Study consisted of three fast water habitats,
two slow water habitats, and a side channel. The mainstem aquatic habitats in Reach 4
were located in a sixteen-foot wide, moderate gradient, cobble- and boulder dominated,
swift flowing channel. Two rapids, one short cascade, one plunge pool, and one mid
channel scour pool were identified. Fast water habitat consisted of one 146-foot long,
fifteen-foot wide, 2.7-foot maximum depth rapid; a thirty-six-foot long, fifteen-foot wide,
2.4-foot maximum depth cascade; and a 275-foot long, eighteen-foot wide, 2.4-foot
maximum depth rapid. Fast water substrate was an equal mixture of sand, gravel, cobble,
and boulders, except for the boulder-dominated cascade. Slow water habitat consisted of
one forty-nine-foot long, twenty-eight-foot wide plunge pool with a maximum depth of
4.3 feet and one forty-four-foot long, seventeen-foot wide mid channel scour pool with a
maximum depth of 2.3 feet.
23
Reach 4 was electrofished for 830 seconds and resulted in the capture of nine rainbow
trout (41%) and thirteen brook trout (59%) for a CPUE of 0.011 fish/sec and 0.016
fish/sec, respectively. Total salmonid CPUE for Reach 4 is 0.027 fish/sec. Rainbow
trout ranged in weight from less than one gram (n=2) to thirteen grams with a median
weight of four grams and an average weight of 5.9 grams. Rainbow trout measured fork
lengths ranged from a minimum of 34 mm to a maximum of 113 mm, with a median fork
length of 76 mm. Thirteen brook trout measured weights ranged from less than one gram
to (n=1) to fifteen grams with a median weight of six grams and an average weight of six
grams. Brook trout measured fork lengths ranged from 39 mm to 114 mm, with a median
fork length of 90 mm. SRG snorkeled the mid channel scour pool described in
PacifiCorp’s Reach 4 for the 2002 Imnaha Creek survey and reported observing no fish.
Further, no fish were reported in the next snorkeled habitat (SO 10, FTRP 5), suggesting
very low fish densities in the section of stream close to the South Fork Impoundment.
The first snorkeled unit where fish were observed occurred in SO 13 (SSPL 7). Snorkel
sampling was not timed in 2002.
Rainbow trout and brook trout were identified in PacifiCorp’s Reach 4. Of PacifiCorp’s
four sampled reaches, Reach 4 exhibited the greatest relative abundance of brook trout
(thirteen individuals, CPUE 0.016 fish/sec). SRG reported the presence of cutthroat trout
in the 2002 survey, but results from the 2014 survey suggest cutthroat trout distribution in
the mainstem South Fork Rogue River was confined to the large, complex habitats of the
lower bypass reach (Reach 1 and Reach 2, Fish Habitat Study). Further work would be
required to confirm the distribution of cutthroat trout in the upper South Fork Rogue
River (above the impoundment) and Imnaha Creek. PacifiCorp’s electrofishing effort in
Reach 4 did not report any fish mortality or incidental species captured.
5.3
South Fork Impoundment
A resource specialist with PacifiCorp sampled the impoundment with a hook and line on
July 8, 2014. Nine rainbow trout with an average fork length of 6.67 inches (169 mm)
24
were caught using small rooster tail lures in forty minutes (2,400 seconds) of angling for
a CPUE of 0.0038 fish/sec. No brook trout were caught. On April 18, 2015, SRG used a
team of two snorkelers to survey the impoundment and results indicate very low fish
densities. The entire impoundment was visually searched in a total snorkel time of fortyfour minutes (2,640 seconds) and reported six rainbow trout in the size class 100 mm to
200 mm for a CPUE of 0.0023 fish/sec. A second snorkel survey effort was conducted in
the afternoon on the same day and two snorkelers spent a total of fifty minutes (3,000
seconds) systematically searching the impoundment. Two rainbow trout in the size class
100 mm – 200 mm were observed for a CPUE of 0.00067 fish/sec. No brook trout were
observed in the snorkel survey. Good water clarity and low stream flows (less than 150
cfs) provided ideal conditions for snorkel surveys. Water temperature in the
impoundment was measured at 7oC at 1214 hour. At the time of the survey the
impoundment was measured to be approximately 160 yards (146 meters) in length with
an average width of 26.7 yards (24.4 meters) and covered an area of approximately 4,266
yd2 (3,568 m2). The impoundment was dominated by sand/silt substrate.
5.4
Pacific Lamprey Survey
On October 1st, and 21st, 2014, Cow Creek Water and Environmental Resources
program staff conducted lamprey presence/absence surveys in the South Fork Rogue
River. The survey report is included as Appendix D.
During the October 1st survey the crew electrofished for lamprey presence/absence
downstream of the South Fork Dam. Lamprey were not detected within the stream reach
sampled during the survey. In addition the crew surveyed upstream of the dam at the
impoundment where Imnaha Creek enters the South Fork Rogue River. The shallow
shoreline was electrofished from the bank, due to sediment depth. Lamprey were not
detected in the area electrofished at the impoundment.
upstream of the South Fork Dam. Lamprey were not detected within the stream reach
sampled during the survey.
25
6.0 DISCUSSION
Observation of freshwater fish communities using snorkel gear has been conducted for
decades (Ellis 1961; Kennleyside 1962; Northcote and Wilkie 1963). Snorkel surveys
have been widely used to assess fish abundance (Pollard 1973), determine species
distribution, estimate size structure (Hankin and Reeves 1988), and evaluate habitat use
(Reeves et. al. 2011). Snorkel surveys are considered effective and efficient means of
assessing freshwater fish populations (Macnaughton et.al. 2014) and offer several
advantages over other sampling methods. For example, snorkeling is feasible when
environmental conditions such as deep or low-conductivity water, which was
encountered sampling the South Fork Rogue River, limit the effectiveness of methods
like electrofishing (Schill and Griffith 1984). Snorkeling gear is cost efficient,
lightweight, and adapts well to surveying remote locations, including large, deep,
complex channels (Thurow 1994). Snorkel surveys require fewer personnel and less
sampling time over other sampling methods (Hankin and Reeves 1988), and snorkeling is
non-lethal and less intrusive than electrofishing or the use of toxicants. Nevertheless,
underwater observation introduces several biases that reduce capture efficiency (Peterson
et.al. 2004). Studies have found the ability to detect and accurately count fish underwater
was influenced by fish size, species, time of day, and stream habitat characteristics such
as habitat complexity, stream flow, water clarity, and water temperature (Thurow et. al.
2006; Hankin and Reeves 1988). In order to compensate for observer bias it is
recommended that raw snorkel counts are adjusted for the effects of these biases by
applying sampling efficiency models (Thurow et. al. 2006, Weaver et al. 2014).
Sampling efficiency studies involve the use of a second method such as multi-pass
electrofishing to determine absolute or true fish numbers. This data is correlated to
snorkel counts to provide adjustment factors to snorkel data to increase sampling
efficiency.
Results reported in the snorkel surveys conducted in the fish community study of the
South Fork Rogue River are raw fish counts unadjusted for the effects of sample biases.
Further, the electrofishing method used was not conducted with the objective of
determining ‘true numbers’ of fish through the technique of multi-pass surveys, which
26
would provide an adjustment factor for snorkel count data, but was conducted instead
with the objective of sampling the fish community for composition in the vicinity of the
South Fork Rogue diversion dam. In addition, low CPUE values derived from the
electrofishing data compared to significantly higher relative abundance values derived
from the snorkel data suggest low sampling efficiency for the electrofishing method,
likely the result of a small sample size compared to the snorkel survey, and
environmental factors of low-conductivity water, and large, deep, complex aquatic
habitat conditions.
27
7.0 REFERENCES
Ellis, D. V. 1961. Diving and photographic techniques for observing and recording
salmon activities. Journal of the Fisheries Research Board of Canada 18:11591166.
Hankin, D. G., and G. H. Reeves. 1988. Estimating total fish abundance and habitat area
in small streams based on visual estimation methods. Canadian Journal of
Fisheries and Aquatic Sciences 45:834-844.
Keenleyside, M. H. A. 1962. Skin diver observations of Atlantic salmon and brook
trout in the Miramichi River, New Brunswick. Journal of the Fisheries Research
Board of Canada 19:625-634.
Macnaughton, C. J., S. Harvey-Lavoie, C. Senay, G. Lanthier, G. Bourque, P. Legendre,
D. Boisclair. 2014 A Comparison of Electrofishing and visual surveying methods
for estimating fish community structure in temperate rivers. River Research and
Applications.
Northcote, T. G., and D. W. Wilkie. 1963. Underwater census of stream fish populations.
Transactions of the American Fisheries Society 92:146-151.
Oregon Department of Fish and Wildlife. 2013. Prospect No. 3 Hydroelectric Project
(FERC 2337-076). Comments on Preliminary Application Document and
Scoping Document; and Study Requests. Umpqua Watershed District Office.
Roseburg, Oregon
PacifiCorp. 2014. Prospect No. 3 Hydroelectric Project FERC Project No.
P-2337. Revised Study Plans – Fish Community and Aquatic Habitat. PacifiCorp,
Hydro Resources, Medford, Oregon.
Peterson, J. T., R. F. Thurow, and J. W. Guzevich. 2004. An Evaluation of Multipass
Electrofishing for Estimating the Abundance of Stream-Dwelling Salmonids.
Transactions of the American Fisheries Society 133:462-475.
Pollard, H. A. II, and T. C. Bjornn. 1973. The effects of angling and hatchery trout on the
abundance of juvenile steelhead trout. Transactions of the American Fisheries
Society 102:745-752.
28
Reeves, G. H., J. D. Sleeper, and D. W. Lang. 2011. Seasonal Changes in Habitat
Availability and the Distribution and Abundance of Salmonids along a Stream
Gradient From Headwaters to Mouth in Coastal Oregon. Transactions of the
American Fisheries Society 140:537-548.
Schill, D. J., and J. S. Griffith. 1984. Use of Underwater observations to estimate
cutthroat trout abundance in the Yellowstone River. North American Journal
of Fisheries Management 4:479-487.
Siskiyou Research Group, 2002. Imnaha Creek 2002 Level II Stream Survey Report.
Prepared for U.S. Forest Service, Rogue River-Siskiyou National Forest
High Cascades Ranger District, Prospect, Oregon.
Siskiyou Research Group, 2015. South Fork Rogue River 2014 Level II Stream
Survey Report. Prepared for PacifiCorp, Hydro Resources,
Medford, Oregon.
Thurow, R. F. 1994. Underwater methods for study of salmonids in the Intermountain
West . U.S. Forest Service General Technical Report INT-GTR-307.
Thurow, R. F., J. T. Peteson, and J.W. Guzevich. 2006. Utility and Validation of Day
and Night Snorkel Counts for Estimating Bull Trout Abundance in First- to
Third-Order Stream. North American Journal of Fisheries Management
26:217-232.
United States Department of Agriculture, U.S. Forest Service. 2014. Stream Inventory
Handbook, Level I and II. Pacific Northwest Region. Version 2.14.
United States Environmental Protection Agency. 2009. National Rivers and Streams
Assessment Field Operations Manual. EPA-841-B-07-009.
Weaver, D. M., T. J. Kwak, K. H. Pollock. 2014. Sampling Characteristics and
Calibration of Snorkel Counts to Estimate Stream Fish Populations.
North American Journal of Fisheries Management 34:1159 – 1166.
29
APPENDIX A
2014 FISH COMMUNITY STUDY
SURVEY MAPS
(FISH HABITAT REACH LOCATIONS)
(FIXED-REACH ELECTROFISHING LOCATIONS)
Bypass Reach
Begin Reach 1
End Reach 1
Begin Reach 2
End Reach 3
End Reach 2
Begin Reach 3
Begin Reach 5
SCALE 1:48000
2014 Fish Habitat Study Reach Break Locations
0
Name: PROSPECT SOUTH
Date: 04/13/15
Scale: 1 inch = 4,000 ft.
1
0
1000
0
1
2 MILES
2000
3000
2
Location: 042° 42' 45.91" N 122° 25' 58.21" W
Copyright (C) 2009 MyTopo
4000
3
5000
Copyright (C) 2009
MyTopo
4 KILOMETER
Begin Reach 1
End Reach 1
Begin Reach 4
End Reach 4
Begin Reach 2
End Reach 2
Begin Reach 3
End Reach 3
SCALE 1:12000
2014 Fish Community Study Electrofishing Fixed-Reach Locations
0.0
0.1
0.2
0.3
0
0
Name: PROSPECT SOUTH
Date: 04/13/15
Scale: 1 inch = 1,000 ft.
Location: 042° 42' 15.12" N 122° 23' 18.02" W
Copyright (C) 2009 MyTopo
0.4
0.5
0.6
0.7 M
1000 YARDS
Copyright (C) 2009
MyTopo
1 KILOMETER
APPENDIX B
FISH CALCULATION TABLES
FISH HABITAT STUDY
REACH 1 – REACH 3, & REACH 5
Salmonid Density Calculation Table for South Fork Rogue River
Reach 1, 2014 Level II Stream Inventory
(Produced by Siskiyou Research Group)
Salmonid Tally Table
SO
#
8
19
28
40
49
59
71
Snorkeled Habitat Area Table
SW
SW
SO
FW
FW
2
L (ft) W (ft) Area (ft2)
L (ft) W (ft) Area (ft ) #
74
32
2368
20
77
36
2772
108
41
4428
44 122
51
6222
117
39
4563
73 262
19
4978
66
64
4224
182
28
5096
103
40
4120
239
46
10994
Total Area (ft2)
Total Area (yd2)
35793
Total Area (ft2)
13972
3977.000
Total Area (yd2)
1552.444
2
Reach
SW
Area
(ft )
144718
Reach
FW
Area
(ft2)
198303
24.73
% Reach SW Area Snorkeled
% Reach FW Area Snorkeled
7.05
% Reach Habitat Area Snorkeled
14.51
2
Salmonid Species Density (fish/yd
)
ONMY
SW
1
0.007
FW
1
0.004
SAFO
SW
1
0.000
FW
1
0.000
>2
0.064
>2
0.015
>2
0.002
>2
SW
6
3
5
2
8
4
ONMY
2
29
25
51
11
65
10
38
28
229
1
>3
5
4
6
ONCL
1
2
5
4
3
4
1
5
25
0
2
1
1
3
16
18
1
1
3
2
ONMY
2
>3
7
2
8
5
1
1
FW
ONCL
2
>3
SAFO
2
>3
1
0
5
1
5
1
0
0
0
6
20
3
0
0
0
0
0
0
0
6
23
0
0
0
0
0
0
Total ONMY in SW
Total ONCL in SW
Total SAFO in SW
282
34
6
Total ONMY in FW
Total ONCL in FW
Total SAFO in FW
29
0
0
Total ONKI in SW
0
Total ONKI in FW
0
0.000
>2
Species
COXX
0.000
0.000
COXX
>2
Total ONMY for Reach
Total ONCL for Reach
Total SAFO for Reach
Total ONKI for Reach
0.009
>2
>2
ONKI
2
>3
1
Other Fish
#
Habitat Type
0
SW
2
FW
311
34
6
0
Total Salmonids in SW
Total Salmonids in FW
Total Salmonids in Reach
322
29
351
Total 1 in Reach
Total >2 in Reach
317
2
Total Salmonid Species Density (fish/y ) for Reach
ONMY ONCL
SAFO ONKI
0.056
0.006
0.001 0.000
Total Salmonid Density (fish/y2) for Reach
SW
0.081
FW
1
>2
Reach
1
Total 1 ONMY in FW
Total >2 ONMY in FW
Total 1 ONCL in FW
Total >2 ONCL in FW
Total 1 SAFO in FW
Total >2 SAFO in FW
Total 1 ONKI in FW
Total >2 ONKI in FW
0.000
FW
ONKI
2
>3
28
254
0
34
0
6
0
0
ONKI
1
0.000
1
0.000
1
Total 1 ONMY in SW
Total >2 ONMY in SW
Total 1 ONCL in SW
Total >2 ONCL in SW
Total 1 SAFO in SW
Total >2 SAFO in SW
Total 1 ONKI in SW
Total >2 ONKI in SW
ONCL
SW
1
0.000
FW
1
0.000
SW
>3
4
6
4
SAFO
1
2
>3
0.019
0.006
0.057
0.063
Salmonid Density Calculations Based on Snorkeled Habitats Only at a Minimum 10% Sampling Frequency
(For Reaches Snorkeled Above/Below Fish Limit, Calculations Based on Fish-Bearing Segment Only)
34
0
0
Salmonid Density Calculation Table for South Fork Rogue River
Reach 2, 2014 Level II Stream Inventory
SO
SW
SW
SO
FW
FW
2
#
85 115
36
4140
106 159
48
7632
132 65
47
3055
97
61
35
2135
34
4046
159 80
46
3680
105 119
34
2754
114 81
127 44
23
1012
137 51
27
1377
146 87
39
3393
153 86
39
3354
Total Area (ft2)
Total Area (yd2)
22211
Total Area (ft2)
14367
2467.889
Total Area (yd2)
1596.333
2
Reach
SW
Area
(ft )
136759
Reach
FW
Area
(ft2)
200185
16.24
7.18
10.86
2
)
ONMY
SW
1
0.011
FW
1
0.009
SAFO
SW
1
0.000
FW
1
0.000
>2
0.083
>2
0.026
>2
0.002
>2
7
7
ONMY
2
49
20
25
15
6
17
18
44
28
194
1
6
6
2
>3
4
1
1
SW
ONCL
1
2
>3
1
2
2
10
0
5
1
8
3
1
5
4
5
ONMY
2
>3
15
2
9
14
1
1
FW
ONCL
2
>3
1
SAFO
2
>3
1
ONKI
2
>3
1
0
2
2
0
0
0
14
38
3
0
0
1
0
0
1
0
Total 1 ONMY in FW
Total >2 ONMY in FW
Total 1 ONCL in FW
Total >2 ONCL in FW
Total 1 SAFO in FW
Total >2 SAFO in FW
Total 1 ONKI in FW
Total >2 ONKI in FW
14
41
0
1
0
1
0
0
Total ONMY in SW
Total ONCL in SW
Total SAFO in SW
232
11
4
Total ONMY in FW
Total ONCL in FW
Total SAFO in FW
55
1
1
Total ONKI in SW
0
Total ONKI in FW
0
0.000
>2
Species
COXX
0.000
0.000
COXX
>2
0.004
>2
>2
Other Fish
#
Habitat Type
0
SW
0
FW
287
12
5
0
247
57
304
Total 1 in Reach
Total >2 in Reach
262
2
ONMY ONCL
SAFO ONKI
0.071
0.003
0.001 0.000
SW
0.100
FW
1
>2
Reach
1
28
204
0
11
0
4
0
0
0.001
FW
ONKI
2
>3
Total 1 ONMY in SW
Total >2 ONMY in SW
Total 1 ONCL in SW
Total >2 ONCL in SW
Total 1 SAFO in SW
Total >2 SAFO in SW
Total 1 ONKI in SW
Total >2 ONKI in SW
ONKI
1
0.000
1
0.001
1
1
1
3
ONCL
SW
1
0.000
FW
1
0.000
SW
SAFO
1
2
>3
1
2
0.036
0.010
0.064
0.075
42
0
0
Salmonid Density Calculation Table for South Fork Rogue River Reach 3, 2014 Level II Stream Inventory
SO
SW
SW
SO
FW
FW
2
#
162 99
42
4158
182 81
38
3078
171 51
20
1020
206 218
36
7848
181 107
34
3638
230 44
35
1540
34
1530
190 88
35
3080
255 45
32
3744
202 115
38
4370
284 117
211 44
37
1628
220 62
19
1178
229 56
31
1736
238 39
29
1131
247 122
37
4514
256 59
44
2596
263 49
24
1176
24
1440
274 60
283 106
41
4346
291 65
27
1755
300 60
65
3900
Total Area (ft2)
Total Area (yd2)
Reach
Reach
41666
Total Area (ft2)
17740
4629.556
Total Area (yd2)
1971.111
SW
FW
Area
(ft2)
174524
Area
(ft2)
406763
23.87
4.36
10.22
2
)
ONMY
SW
1
0.015
FW
1
0.012
SAFO
SW
1
0.000
FW
1
0.000
>2
0.037
>2
0.015
>2
0.006
>2
1
7
9
10
17
4
5
4
3
4
5
0
68
ONMY
2
20
15
15
14
9
8
8
10
6
20
0
3
1
3
3
22
157
>3
1
SW
ONCL
1
2
>3
1
2
0
1
4
1
6
16
0
0
1
1
1
4
9
8
1
2
ONMY
2
>3
11
10
2
3
1
3
1
FW
ONCL
2
>3
0
2
5
15
5
22
5
0
0
0
24
28
2
0
0
0
SAFO
2
>3
1
0
0
0
0
Total 1 ONMY in SW
68
Total 1 ONMY in FW
24
173
0
0
2
27
0
0
Total >2 ONMY in FW
Total 1 ONCL in FW
Total >2 ONCL in FW
Total 1 SAFO in FW
Total >2 SAFO in FW
Total 1 ONKI in FW
Total >2 ONKI in FW
30
0
0
0
0
0
0
Total ONMY in SW
Total ONCL in SW
Total SAFO in SW
241
0
29
Total ONMY in FW
Total ONCL in FW
Total SAFO in FW
54
0
0
Total ONKI in SW
0
Total ONKI in FW
0
0.000
>2
Species
COXX
0.000
0.000
COXX
>2
0.000
>2
>2
Other Fish
#
Habitat Type
0
SW
0
FW
295
0
29
0
270
54
324
Total 1 in Reach
Total >2 in Reach
230
2
ONMY ONCL
SAFO ONKI
0.045
0.000
0.004 0.000
SW
0.058
FW
1
>2
Reach
1
Total >2 ONMY in SW
Total 1 ONCL in SW
Total >2 ONCL in SW
Total 1 SAFO in SW
Total >2 SAFO in SW
Total 1 ONKI in SW
Total >2 ONKI in SW
0.000
FW
ONKI
2
>3
ONKI
2
>3
1
ONKI
1
0.000
1
0.000
1
1
ONCL
SW
1
0.000
FW
1
0.000
SW
SAFO
1
2
>3
0.027
0.014
0.035
0.049
94
0
0
Salmonid Density Calculation Table for South Fork Rogue
River Reach 5, 2014 Level II Stream Inventory
SO
SW
SW
SO
FW
FW
2
#
313 57
39
2223
308 233
54
12582
36
1296
327 190
43
8170
324 36
331 49
40
1960
356 64
55
3520
373 90
33
2970
339 142
37
5254
396 187
48
8976
347 42
42
1764
416 162
42
6804
357 63
55
3465
367 166
47
7802
438 94
46
4324
379 115
28
3220
463 208
43
8944
391 143
30
4290
488 148
34
5032
400 129
48
6192
411 116
36
4176
421 125
40
5000
432 149
45
6705
443 161
43
6923
450 117
27
3159
459 77
37
2849
469 60
40
2400
478 69
32
2208
487 259
36
9324
Total Area (ft2)
Total Area (yd2)
80210
Total Area (ft2)
61322
8912.222
Total Area (yd2)
6813.556
2
Reach
SW
Area
(ft )
422697
Reach
FW
Area
(ft2)
1111532
18.98
5.52
9.22
2
)
ONMY
SW
1
0.018
FW
1
0.008
SAFO
SW
1
0.000
FW
1
0.000
>2
0.031
>2
0.010
>2
0.001
>2
1
4
5
12
15
6
11
4
7
8
22
16
3
8
3
9
9
6
9
ONMY
2
8
8
7
16
9
17
23
14
11
5
18
23
7
17
12
11
20
8
16
157 250
>3
SW
ONCL
1
2
>3
1
5
7
5
1
5
18
2
7
3
ONMY
2
8
4
7
2
15
13
1
9
7
53
66
>3
1
1
1
FW
ONCL
2
>3
SAFO
2
>3
1
ONKI
2
>3
1
1
2
1
6
1
2
1
6
1
2
1
1
25
0
0
0
3
10
0
0
0
0
4
0
1
0
0
1
1
0
Total 1 ONMY in SW
Total >2 ONMY in SW
Total 1 ONCL in SW
Total >2 ONCL in SW
Total 1 SAFO in SW
Total >2 SAFO in SW
Total 1 ONKI in SW
Total >2 ONKI in SW
157
275
0
0
3
10
0
0
Total 1 ONMY in FW
Total >2 ONMY in FW
Total 1 ONCL in FW
Total >2 ONCL in FW
Total 1 SAFO in FW
Total >2 SAFO in FW
Total 1 ONKI in FW
Total >2 ONKI in FW
53
70
0
1
0
2
0
0
Total ONMY in SW
Total ONCL in SW
Total SAFO in SW
432
0
13
Total ONMY in FW
Total ONCL in FW
Total SAFO in FW
123
1
2
Total ONKI in SW
0
Total ONKI in FW
0
0.000
>2
Species
COXX
0.000
0.000
COXX
>2
0.000
>2
>2
Other Fish
#
Habitat Type
0
SW
0
FW
555
1
15
0
445
126
571
Total 1 in Reach
Total >2 in Reach
358
2
ONMY ONCL
SAFO ONKI
0.035
0.000
0.001 0.000
SW
0.050
FW
1
>2
Reach
1
1
4
3
0.000
FW
ONKI
2
>3
1
ONKI
1
0.000
1
0.000
1
2
1
3
1
1
ONCL
SW
1
0.000
FW
1
0.000
SW
SAFO
1
2
>3
0.018
0.014
0.023
0.036
213
0
0
APPENDIX C
FIXED-REACH ELECTROFISHING SURVEY
SUMMARIES
REACH 1 - REACH 4
South Fork below RM 10.25 (Reach no. 1)
Low conductance. Shocker set to 60 Hz, 550 V.
Rainbow Trout
Weight (g) Length (mm)
45
147
8
81
21
122
1
42
13
116
9
97
8
93
1
53
1
47
1
45
8
93
9
95
8
97
34
151
10
84
14
109
19
121
22
135
13
114
11
90
Remarks
Date/Time (PDT):
Approx. L. (ft): Weight (g)
8/18/2014 Shock Time (s):
750 Q (cfs):
Brook Trout
Length (mm)
13
114
23
134
51
167
Remarks
1310
14
Metric
n
CPUE (n/sec)
min (mm)
med (mm)
max (mm)
Length Bin
Rainbow
40
60
80
100
120
140
160
180
200
220
240
<1 g
<1 g
<1 g
Brook
20
3
0.015267176 0.002290076
42
114
96
134
151
167
Frequency
0
0
4
0
0
0
8
0
3
1
3
1
2
0
0
1
0
0
0
0
0
0
Reach 1
9
8
7
6
Frequency
Reach:
Remarks:
5
4
Rainbow
3
Brook
2
1
0
40
60
80
100 120 140 160 180 200 220 240
Fork Lenght (mm)
South Fork between RM 10.5 and RM 10.25 (Reach no. 2)
Rainbow Trout
Length (mm)
5
78
6
80
8
97
23
129
1
45
9
95
13
109
14
116
18
115
36
156
60
185
55
165
40
155
7
89
6
83
4
80
25
139
4
78
52
155
1
31
1
39
1
39
7
87
15
113
7
83
33
151
Weight (g)
Remarks
Date/Time (PDT):
Approx. L. (ft): 8/18/2014 Shock Time (s):
750 Q (cfs):
Weight (g)
83
117
9
30
Brook Trout
Length (mm)
206
121
96
146
Remarks
1119
14
Metric
n
CPUE (n/sec)
min (mm)
med (mm)
max (mm)
Length Bin
Rainbow
26
0.023
31
96
185
Frequency
3
1
4
6
4
2
4
1
1
0
0
40
60
80
100
120
140
160
180
200
220
240
Brook
4
0.004
96
133.5
206
0
0
0
1
0
1
1
0
0
1
0
Reach 2
<1
7
6
<1
5
Frequency
Reach:
Remarks:
4
3
Rainbow
Brook
2
1
0
40
60
80
100
120
140
160
Fork Lenght (mm)
180
200
220
240
Reach:
Remarks:
Date/Time (PDT):
Approx. L. (ft): South Fork above dam at RM 10.55 (Reach no. 3)
Rainbow Trout
Length (mm)
Weight (g)
27
5
8
29
4
1
4
Remarks
600 Q (cfs):
Brook Trout
Length (mm)
Weight (g)
138
76
94
147
75
52
75
28
9
21
Frequency
Reach 3
3.5
3
2.5
2
1.5
1
0.5
0
Rainbow
Brook
40
60
80
100
120
140
160
Fork Lenght (mm)
180
200
220
240
1040
Remarks
137
99
131
Metric
n
CPUE (n/sec)
min (mm)
med (mm)
max (mm)
Length Bin
40
60
80
100
120
140
160
180
200
220
240
Rainbow
7
0.007
52
76
147
0
1
3
1
0
1
1
0
0
0
0
Brook
3
0.003
99
131
137
Frequency
0
0
0
1
0
2
0
0
0
0
0
Reach:
Remarks:
Date/Time (PDT):
Approx. L. (ft): Imnaha Creek above dam (Reach no. 4)
Weight (g)
12
1
3
3
12
134
4
1
4
Rainbow Trout
Length (mm)
100
42
74
76
110
113
74
34
80
Remarks
Weight (g)
<1
<1
450 Q (cfs):
Brook Trout
Length (mm)
2
61
7
90
1
39
3
70
2
64
2
63
8
92
11
103
15
114
1
55
6
93
10
105
10
100
Reach 4
4.5
4
Frequency
3.5
3
2.5
2
Rainbow
1.5
Brook
1
0.5
0
40
60
80
100
120
140
160
Fork Lenght (mm)
180
200
220
240
830
Remarks
<1
Metric
Rainbow
Brook
n
9
13
CPUE (n/se
0.011
0.016
min (mm)
34
39
med (mm)
76
90
max (mm)
113
114
Length Bin
Frequency
40
1
1
60
1
1
80
4
4
100
1
4
120
2
3
140
0
0
160
0
0
180
0
0
200
0
0
220
0
0
240
0
0
APPENDIX D
PACIFIC LAMPREY SURVEY FINAL REPORT
Prospect #3 Lamprey Surveys
Report for PacifiCorp
Prepared by Kelly Coates
Water and Environmental Resources Program Manager
Cow Creek Band of Umpqua Tribe of Indians
February 25th, 2015
Table of Contents
Background ................................................................................................................................................. 2
Methods........................................................................................................................................................ 2
Results .......................................................................................................................................................... 2
Appendix ...................................................................................................................................................... 7
List of Tables
Table 1. Electrofishing data downstream of the South Fork Dam, and at the Impoundment
immediately upstream of the South Fork dam. ............................................................................... 2
Table 2. Electrofishing data upstream of the South Fork Dam. ..................................................... 5
Table 3. Physical habitat data. Cells that do not have information indicate a section of stream
that was too deep to sample. ........................................................................................................... 6
Table of Figures
Figure 1. Downstream photo of electrofishing reach, below South Fork Dam. ............................ 3
Figure 2. Upstream photo of electrofishing reach, below South Fork Dam. ................................. 3
Figure 3. View of Impoundment from trail upstream of South Fork Dam .................................... 4
Figure 4. Area of Impoundment upstream of South Fork Dam that was electrofished ................ 4
1
Background
As part of the relicensing process for PacifiCorp’s Prospect #3 Hydropower Project, near
Prospect, Oregon, PacifiCorp contracted with the Cow Creek Band of Umpqua Tribe of Indians
to perform lamprey presence surveys in the fall of 2014. The intent of the surveys is to inform
PacifiCorp’s Study Plan for the hydro project relicensing.
Methods
On October 1st, and 21st, 2014, Cow Creek Water and Environmental Resources program
staff conducted lamprey presence/absence surveys in the South Fork Rogue River. The surveys
included electrofishing using a Smith-Root LR 24 electrofisher with pre-determined lamprey
settings, and collection of physical habitat data including stream width, depth and stream bed
size. The protocol used during the study including detailed methods and equipment used for the
surveys are attached in the appendix. The protocol was sent to PacifiCorp for approval prior to
commencing sampling activities.
Results
During the October 1st Survey the crew electrofished for lamprey presence/absence
downstream of the South Fork Dam. Lamprey were not detected within the stream reach sampled
during the survey. In addition the crew surveyed upstream of the dam at the impoundment where
Imnaha Creek enters the South Fork Rogue River. The shallow shoreline was electrofished from
the bank, due to sediment depth. Lamprey were not detected in the area electrofished at the
impoundment. Table 1. lists electrofishing data for the October 1st surveys. Please see the
appendix for the electrofishing data sheet.
Table 1. Electrofishing data downstream of the South Fork Dam, and at the Impoundment
immediately upstream of the South Fork dam.
Date
Time
Location
10-1-14
10:00
42.70794,
-122.39036
42.70781,
-122.38953
10-1-14
16:30
42.70687,
-122.38493
Electrofishing
Pass Number
Downstream
point below
dam
Upstream
point above
dam
Impoundment
just above
South Fork
Dam
Electrofisher
shock time
(seconds)
664
Lamprey
count
1
Stream
Temperature
(°C)
5.3
2
5.3
524
0
1
NA
736
0
2
0
Figure 1. Downstream photo of electrofishing reach, below South Fork Dam.
Figure 2. Upstream photo of electrofishing reach, below South Fork Dam.
3
Figure 3. View of Impoundment from trail upstream of South Fork Dam
Figure 4. Area of Impoundment upstream of South Fork Dam that was electrofished
4
upstream of the South Fork Dam. Lamprey were not detected within the stream reach sampled
during the survey. Table 2. lists electrofishing data for the October 21st surveys. Please see the
appendix for the electrofishing data sheet.
Table 2. Electrofishing data upstream of the South Fork Dam.
Date
Time
Location
10-21-14
12:00
42.70491,
-122.38626
42.70428,
-122.38552
Downstream
point below
dam
Upstream
point below
dam
Electrofishi
ng Pass
Number
1
Stream
Temperatur
e (°C)
6.5
Electrofisher
shock time
(seconds)
1825
Lamprey
count
2
6.8
1656
0
0
Physical habitat data was also collected during the October 21st survey. Physical data included
stream width, water depth, particle size and substrate depth. Of the 21 transects measured, the
average stream width was 15.10 meters. The average maximum water depth was 66 centimeters.
Not all habitat data could be collected due to parts of the stream channel being too deep for the
crew to safely sample. Additional metrics are listed in Table 3. Please see the appendix for the
physical data sheet.
5
Table 3. Physical habitat data. Cells that do not have information indicate a section of stream
that was too deep to sample.
Transect Stream
Water depth
Number Width (m) (cm)
max 25%
1
15.5448
37
2
17.3736
59
41
3
4
5
6
7
8
9
10
11
12
13
14
15
16
15.24
16.42872
15.94104
12.31392
14.69136
15.42288
14.99616
12.8016
16.1544
56
15.24
14.0208
13.716
81
17
16.36776
74
18
19
20
21
66
60
26
29
41
38
31
60
Particle size (mm)
50%
41
39
75% 25%
2
59
2
50%
2
23
37
61
56
1
1
66
62
56
56
59
87
56
52
63
43
81
33
48
14.0208
62
17.0688
13.53312
16.002
23
19
44
Average 15.10
66
33
31
11
63
91
0
0
2
0
63
412
2
2
2
2
2
19
28
10
0
24
74
153
78
64
100
601
87
66
56
306
514
104
2
120
895
90.73
134.19
40.125 60.38
40
2
Substrate depth
(cm)
75% 25% 50% 75%
1-10 1-10
0
1-10 110
50
0
1-10 1-10 0
0
1-10
0
0
92
37
4
2
1-10 1-10
0
1-10
1-10 1-10
1-10
1-10
1-10
12
42
207
0
0
0
50
1-10
1-10
1-10
1-10 10Jan
1-10 1150
1-10 1-10
1-10 1-10
1-10 50
1-10
1-10
1-10
1-10
1150
39.6
6

Fish Community

Transcription

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