Illinois River Watershed - Illinois State Water Survey

Illinois State Water Survey
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Illinois River Watershed
88°
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40
50
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37°
Scale 1:850,000 (1 inch = 13.4 miles)
River
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Map compiled by Misganaw Demissie and Kathleen J. Brown
Digital copy available at http://ilrdss.sws.uiuc.edu
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University of Illinois at Urbana- Champaign
http://www.uiuc.edu
20
POPE
JOHNSON
Illinois Department of Natural Resources
http://dnr.state.il.us
5 10
88°
HARDIN
Derek Winstanley, Chief
Illinois State Water Survey
http://www.sws.uiuc.edu
217- 244- 5459
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JEFFERSON
MONROE
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Sub-watersheds
Fox Major Tributaries
Rivers and Streams
39°
The Illinois River watershed (shaded in light blue) is of vital
importance to the State of Illinois. This large watershed covers
44 percent of the state and 90 percent of Illinois’ population resides
within 55 counties wholly or partially included in the watershed.
The Illinois River, one of the major tributaries of the Mississippi
River, is part of the only inland waterway linking the Great Lakes
to the Gulf of Mexico. The Illinois River watershed has a drainage
area of 28,906 square miles or sq mi (75,156 square kilometers or
sq km), of which approximately 3,058 sq mi (4,920 sq km) are
located in Indiana and 1,070 sq mi (1,722 sq km) in Wisconsin.
The watershed contains the drainage basins of several of the Illinois’
major rivers including the Des Plaines, Kankakee, Fox, Vermilion,
Mackinaw, Spoon, Sangamon, and La Moine Rivers.
The Illinois River watershed recently has become a focus of state
and federal agencies and other organizations interested in integrated
watershed management. As a result, issues being discussed at the
watershed scale are related to habitat restoration, floodplain management, erosion and sedimentation, and water quality. In support of this
effort, the Illinois Scientific Surveys have initiated development of
the Illinois Rivers Decision Support System (http://ilrdss.sws.uiuc.edu)
to organize data and information related to the Illinois River watershed,
to document project activities within the watershed, and to assess and
evaluate the effectiveness of restoration projects and management
practices. This map is one of the products of this effort.
The technical content of the map is the responsibility of the authors.
The user assumes all liability for the interpretation and use of the map.
Lambert Conformal Conic projection based on standard parallels
30° and 45°.
Major Tributaries of the Illinois River Watershed
River
Drainage area
(sq mi)
Des Plaines River
Kankakee River
Fox River
Vermilion River
Mackinaw River
Spoon River
Sangamon River
La Moine River
2,111
5,165
2,658
1,331
1,136
1,855
5,418
1,350
MODIFIED GEOGRAPHIC INFORMATION SYSTEM THEMES
Watershed Boundaries
U.S. Geological Survey Hydrologic Unit Map, 1974. Scale 1:500,000.
Major Rivers and Tributaries
U.S. Geological Survey Digital Line Graph file, Hydrography layer, 1980-1986.
Scale 1:250,000.
MASSAC
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37°
89°
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CLINTON
ST. CLAIR
FOX Major Watersheds
DOUGLAS
MOULTRIE
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Lakes > 50 acres
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SCHUYLER
ADAMS
40°
MASON
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Ve
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HANCOCK
Lakes
Illinois Environmental Protection Agency lakes theme, 1996. Lake Michigan
extracted from Environmental Systems Research Institute data and maps, 2000.
Scale: 1:100,000.
MAP SERIES 2003-01
Printed by the authority of the State of Illinois (02-03-24491-4M)