Morrison County Lake Quality
Minnesota, 16 lakes, average grade B (Good)
There are 16 graded lakes in Morrison County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.
Many of the county's lakes are deep glacial basins — over 50 feet at their deepest point — which gives them thermal stratification and a buffer against summer warming. Cedar Lake (grade A) is the cleanest in the county.
Quick Answers for Morrison County
Planning a trip? Check special fishing regulations for Cedar Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Minnesota regulations index.
DNR Reports (46)
Minnesota DNR LakeFinder resources for lakes in Morrison County. Showing 12 most recent — browse all reports →
- —Fisheries Lake Survey — SullivanFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — ShamineauFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — RoundFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — RiceFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — PineFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — PierzFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — PeavyFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — Green Prairie FishFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — Fish TrapFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — CrookneckFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — CedarFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — AlottFisheries Lake Survey · MN DNR LakeFinder
All Lakes in Morrison County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Cedar Lake | A | 16.4 ft | 88 ft | 11 µg/L |
| 2 | Alexander Lake | A | 16.5 ft | 64 ft | 16.5 µg/L |
| 3 | Pine Lake | A | 15.1 ft | 59 ft | 12 µg/L |
| 4 | Sullivan Lake | A | 10.8 ft | 57 ft | 14 µg/L |
| 5 | Shamineau Lake | A | 12.5 ft | 52 ft | 14 µg/L |
| 6 | Peavy Lake | A | 13.6 ft | 63 ft | 8 µg/L |
| 7 | Crookneck Lake | B | 11.2 ft | 22 ft | 22 µg/L |
| 8 | Fish Trap Lake | B | 10 ft | 42 ft | 22 µg/L |
| 9 | Alott Lake | B | 10.2 ft | 34 ft | - |
| 10 | Round Lake | B | 9.5 ft | 20 ft | 21 µg/L |
| 11 | Unnamed Lake | C | 6.9 ft | - | - |
| 12 | Green Prairie Fish Lake | C | 8 ft | 22 ft | - |
| 13 | Ferrell Lake | C | 8.9 ft | - | - |
| 14 | Fosdick Lake | C | 8.9 ft | - | - |
| 15 | Pierz Lake | C | 8 ft | 34 ft | - |
| 16 | Rice Lake | F | 2 ft | 8 ft | - |
Source: EPA National Aquatic Resource Surveys, 2026.