Crawford County Lake Quality
Wisconsin, 1 lakes, average grade F (Very Poor)
Crawford County has 1 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. The county average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.
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. Unnamed Lake (F) is the cleanest in the county.
Quick Answers for Crawford County
Planning a trip? Check special fishing regulations for Unnamed Lake, and the best times to fish — or browse the full Wisconsin regulations index.
DNR Reports (5)
Wisconsin DNR Fisheries Survey resources for lakes in Crawford County. browse all reports →
- 2025Mississippi River Pools 9 and 10 fall survey, 2025Fisheries Survey · WI DNR · 2025 (PDF)
- 2024Mississippi River Pool 10 McGregor Lake HREP survey, 2024Fisheries Survey · WI DNR · 2024 (PDF)
- 2024Mississippi River Pools 9 and 10 tailwater survey, 2024Fisheries Survey · WI DNR · 2024 (PDF)
- 2017Mississippi River Pool 9 Lansing game fish survey, 2017Fisheries Survey · WI DNR · 2017 (PDF)
- 2015An Evaluation of Fishery Trends at the Ambrough Slough Habitat Project, 2015Fisheries Survey · WI DNR · 2015 (PDF)
All Lakes in Crawford County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Unnamed Lake | F | 1.2 ft | - | 128 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.