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LakeQuality
Late afternoon sun over Slim Lake, scattering a bright path across wind-textured water
C

Jackson County Lake Quality

Illinois, 14 lakes, average grade C (Fair)

Jackson County holds 14 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 1 of those lake carry an A–F grade. The county-level summary describes that subset, not every water body listed. Jackson County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.

Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Kinkaid Lake (C) is the cleanest in the county.

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All Lakes in Jackson County

14 lakes · 1 graded, 13 not rated1 graded lake · 13 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
1CKinkaid LakeJacksonCNo recent samples23.5 µg/L15.8 µg/LNo recent samples✓ Public
NRSpring Arbor LakeJacksonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCarbondale ReservoirJacksonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCedar LakeJacksonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTower Island ChuteJacksonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLovets PondJacksonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake MurphysboroJacksonNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRChautauqua LakeJacksonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRElkville ReservoirJacksonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFox LakeJacksonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSnider LakeJacksonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCampbell LakeJacksonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRShirley SloughJacksonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCampus LakeJacksonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded

NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.

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See how Jackson County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..

Source: EPA National Aquatic Resource Surveys, 2026.