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LakeQuality
B

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.

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DNR Reports (46)

Minnesota DNR LakeFinder resources for lakes in Morrison County. Showing 12 most recent — browse all reports →

All Lakes in Morrison County

RankLakeGradeClarityMax DepthPhosphorus
1Cedar LakeA16.4 ft88 ft11 µg/L
2Alexander LakeA16.5 ft64 ft16.5 µg/L
3Pine LakeA15.1 ft59 ft12 µg/L
4Sullivan LakeA10.8 ft57 ft14 µg/L
5Shamineau LakeA12.5 ft52 ft14 µg/L
6Peavy LakeA13.6 ft63 ft8 µg/L
7Crookneck LakeB11.2 ft22 ft22 µg/L
8Fish Trap LakeB10 ft42 ft22 µg/L
9Alott LakeB10.2 ft34 ft-
10Round LakeB9.5 ft20 ft21 µg/L
11Unnamed LakeC6.9 ft--
12Green Prairie Fish LakeC8 ft22 ft-
13Ferrell LakeC8.9 ft--
14Fosdick LakeC8.9 ft--
15Pierz LakeC8 ft34 ft-
16Rice LakeF2 ft8 ft-

Source: EPA National Aquatic Resource Surveys, 2026.