Yellow Medicine County Lake Quality
Minnesota, 5 lakes, average grade D (Poor)
Only 5 lakes in Yellow Medicine 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-wide average grade is D — water quality issues are persistent across most of the monitored basins. 2 lakes fall into the F bracket outright.
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. Curtis Lake (D) is the cleanest in the county.
Quick Answers for Yellow Medicine County
Planning a trip? Check special fishing regulations for Curtis Lake, and the best times to fish — or browse the full Minnesota regulations index.
DNR Reports (14)
Minnesota DNR LakeFinder resources for lakes in Yellow Medicine County. Showing 12 most recent — browse all reports →
- —Fisheries Lake Survey — WoodFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — TysonFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — Del ClarkFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — CurtisFisheries Lake Survey · MN DNR LakeFinder
- —Fish Stocking History — CurtisFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — CurtisPublic Water Access Sites · MN DNR LakeFinder
- —Aquatic Plant Report — Del Clark (1393)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — Del ClarkFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — Del ClarkPublic Water Access Sites · MN DNR LakeFinder
- —Public Water Access Sites — TimmPublic Water Access Sites · MN DNR LakeFinder
- —Fish Stocking History — TysonFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — TysonPublic Water Access Sites · MN DNR LakeFinder
All Lakes in Yellow Medicine County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Curtis Lake | D | 4 ft | 8 ft | - |
| 2 | Del Clark Lake | D | 5 ft | 30 ft | - |
| 3 | Tyson Lake | D | 4.5 ft | 8 ft | - |
| 4 | Wood Lake | F | 3 ft | 9 ft | 220 µg/L |
| 5 | Timm Lake | F | 2 ft | - | - |
Source: EPA National Aquatic Resource Surveys, 2026.