Browse Critical Trends Assessment Program Regional Watershed Assessments by Title

  • Post, Susan L. (Illinois Dept. of Natural Resources, 1997)
    The Mackinaw River originates in Ford County near Sibley and flows in a westerly direction before joining the Illinois River at River Mile 147.7, downstream of Pekin. The boundaries of the Mackinaw River Area Assessment ...
    untranslated PDF (79MB)
  • (Illinois Dept. of Natural Resources, 2005-07)
    untranslated PDF (12MB)
  • Illinois Department of Natural Resources. Office of Scientific Research and Analysis.; Illinois Department of Natural Resources. State Geological Survey Division. (Illinois Dept. of Natural Resources, 2002)
    The Mississippi Western Five Assessment Area is roughly defined by those watersheds in Illinois that drain into the reach of the Mississippi River between Muscatine, Iowa, and Dallas City, IL. The area covers approximately ...
    untranslated PDF (3MB)
  • (Illinois Dept. of Natural Resources, 2001)
    The Prairie Parklands is a 1,477- square-mile triangle of flat to gently rolling land that covers portions of eight counties in northeastern Illinois: Cook, Will, Kendall, Grundy, LaSalle, Kankakee, Ford, and ...
    untranslated PDF (6MB)
  • Illinois Department of Natural Resources. Office of Scientific Research and Analysis. (Illinois Dept. of Natural Resources, 1999)
    The Prairie Parklands area encompasses approximately 1,477 square miles (945,500 acres) in northeastern Illinois; including large parts of Will, Grundy, and Kendall counties, and smaller portions of Cook, Kankakee, Ford, ...
    untranslated PDF (4MB)
  • Illinois Department of Natural Resources (Illinois Dept. of Natural Resources, 1996-11)
    As-part of Phase II of the Critical Trends Assessment Project (CTAP), a regional assessment of the status of natural resources is planned for each model Resource Rich Area (RRA) and for RRAs where a local partnership forms ...
    untranslated PDF (8MB)
  • Lyons, Stephen (Illinois Dept. of Natural Resources, 2005-10)
    untranslated PDF (23MB)
  • Illinois Department of Natural Resources, Office of Scientific Research and Analysis; Illinois Department of Natural Resources, Illinois State Water Survey (Illinois Dept. of Natural Resources, 2002)
    The Shawnee Area is roughly defined as that portion of the Shawnee Hills located in Hardin and Pope counties and the eastern third of Johnson County, as well as small portions of Massac, Saline, and Gallatin counties. The ...
    untranslated PDF (2MB)
  • (Illinois Dept. of Natural Resources, 1998)
    The Sinkhole Plain Area Assessment covers an area of about 1,228 miles2 (785,822 acres) in southwestern Illinois bordering the Mississippi River. It includes all of Monroe, much of St. Clair, and portions of Randolph and ...
    untranslated PDF (4MB)
  • (Illinois Dept. of Natural Resources, 1998)
    The East Fork of the Spoon River rises to the north of Neposet in Bureau County and the West Fork rises to the east of Kewanee in Henry County. The forks join near the center of Stark County to form the main channel. The ...
    untranslated PDF (4MB)
  • (Illinois Dept. of Natural Resources, 1998)
    The Sugar-Pecatonica Area Assessment encompasses approximately 796.3 square miles (509,675 acres) in north central Illinois along the Wisconsin/Illinois border. The area includes virtually all of Stephenson County, the ...
    untranslated PDF (4MB)
  • Krohe, James Jr. (Illinois Dept. of Natural Resources, 1999)
    Beginning in 1838, officials in the then-territory of Wisconsin asserted that the watershed of the Pecatonica River and the Sugar River, its main tributary, and the rest of Illinois’ northernmost 14 counties belonged ...
    untranslated PDF (1MB)
  • Illinois Department of Natural Resources, Office of Scientific Research and Analysis; Illinois Department of Natural Resources, State Geological Survey Division (Illinois Dept. of Natural Resources, 1999)
    The Thorn Creek Assessment Area is an approximately 104.26-mile2 (66,725 acre) area that includes portions of southern Cook County and northeastern Will County. This assessment area consists of the entire Thorn Creek basin ...
    untranslated PDF (3MB)
  • Illinois Department of Natural Resources, Office of Scientific Research and Analysis; Illinois Department of Natural Resources, State Geological Survey Division (Illinois Dept. of Natural Resources, 1998)
    The Upper Des Plaines Area Assessment covers an area of approximately 346 mile2 (221,637 acres) spanning central Lake County, north-central Cook County, and the northeastern portion of Du Page County. The Des Plaines River ...
    untranslated PDF (4MB)
  • Illinois Dept. of Natural Resources Office of Realty and Environmental Planning (Illinois Dept. of Natural Resources, 1998)
    Take a canoe trip down the upper Des Plaines River from just north of the Wisconsin border south to the Cook County town of Lyons, and you can see the history of urbanization in Illinois laid out like a diorama. As the ...
    untranslated PDF (91MB)
  • Illinois Department of Natural Resources, Office of Scientific Research; Illinois Department of Natural Resources, Illinois State Water Survey (Illinois Dept. of Natural Resources, 2001)
    The Upper Rock River Assessment Area is defined by that portion of the Rock River watershed downstream from the Illinois-Wisconsin state line to the Rock River's confluence with Pine Creek near Grand Detour. The area falls ...
    untranslated PDF (4MB)
  • (Illinois Dept. of Natural Resources, 1999)
    The Sangamon River basin drains 5,419 square miles and forms the largest watershed of any of the tributaries of the Illinois River. The main stem of the Sangamon River flows more than 240 miles. This assessment report ...
    untranslated PDF (4MB)
  • Illinois Dept. of Natural Resources (Illinois Dept. of Natural Resources, 2000)
    The Vermilion River Assessment Area is located in north central Illinois and includes parts of seven counties - Ford, Iroquois, LaSalle, Livingston, Marshall, McLean, and Woodford. It encompasses 1,331 square miles and ...
    untranslated PDF (4MB)
  • Illinois Department of Natural Resources (Illinois Dept. of Natural Resources, 1999)
    The area discussed in this assessment coincides with the boundaries of the Illinois portion of the Vermilion River basin as determined by the Illinois Environmental Protection Agency. This area, covering approximately 1,485 ...
    untranslated PDF (4MB)
  • Lundgren,Jonathan; Post,Susan L. (Illinois Dept. of Natural Resources, 2004-03)
    untranslated PDF (41MB)