Pipestone County Lake Quality
Minnesota, 1 lake, average grade F (Algae-prone)
Only 1 lakes in Pipestone County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. 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. Split Rock Reservoir (F) is the cleanest in the county.
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Quick Answers for Pipestone County
Planning a trip? Check special fishing regulations for Split Rock Reservoir, whether the fish are safe to eat, and the best times to fish — or browse the full Minnesota regulations index.
DNR Reports (3)
Minnesota DNR LakeFinder resources for lakes in Pipestone County. browse all reports →
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — Split Rock ReservoirFisheries Lake Survey · MN DNR LakeFinder
- —Fish Stocking History — Split Rock ReservoirFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — Split Rock ReservoirPublic Water Access Sites · MN DNR LakeFinder
All Lakes in Pipestone County
1 lake1 graded lake
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|---|
| 1 | FSplit Rock ReservoirPipestone | F | 1.3 ft | 241 µg/L | 47.5 µg/L | No recent samples | 16 ft | ✓ Public |
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Other Counties in Minnesota
See how Pipestone County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 39 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.