Browse Critical Trends Assessment Program Regional Watershed Assessments by Subject "Karst --Illinois"

  • (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 ...


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