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

Lee County Lake Quality

Iowa, 3 lakes, average grade B (Good)

Lee County holds 3 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. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.

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. Poll Miller Park Lake (B) is the cleanest in the county.

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All Lakes in Lee County

3 lakes · 1 graded, 2 not rated1 graded lake · 2 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
1BPoll Miller Park LakeLeeB5.9 ft28 µg/L7.7 µg/LNo recent samplesNot recorded
NRGreen BayouLeeNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake WildernessLeeNRNo 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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Source: EPA National Aquatic Resource Surveys, 2026.