Green County Lake Quality
Wisconsin, 1 lake, measured by Wisconsin DNR
Green County holds 1 monitored lake. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. The 1 monitored lake in Green County carries whatever clarity, phosphorus, and chlorophyll-a readings Wisconsin DNR has published, shown as reported.
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.
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Quick Answers for Green County
Planning a trip? Check special fishing regulations for Decatur Lake — or browse the full Wisconsin regulations index.
DNR Reports (2)
Wisconsin DNR Fisheries Survey resources for lakes in Green County. browse all reports →
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2025Decatur Lake spring shocking survey, 2025Spring Shocking Survey · WI DNR · 2025 (PDF)
- 2021Beckman Lake Fishery Summary, 2021Fisheries Survey · WI DNR · 2021 (PDF)
All Lakes in Green County
1 lake · 0 ranked on readings, 1 without enough sampling0 lakes ranked on readings · 1 without enough sampling, hidden
| # | Lake | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|
| Decatur LakeGreen | No recent samples | No recent samples | No recent samples | No recent samples | 10 ft | Not recorded |
NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.
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Source: the Wisconsin Department of Natural Resources. See data sources.