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Morrison County Lake Quality

Minnesota, 16 lakes, average grade A (Excellent)

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's average grade is A — among the cleanest in Minnesota. 7 lakes pull an A on their own, and almost none fall into the D or F brackets.

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. Sullivan Lake (grade A) is the cleanest in the county.

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Where to stay near Morrison County

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Quick Answers for Morrison County

Cleanest lakes in Morrison County →Cleanest lakes in Minnesota →Safest swimming lakes in Minnesota →

Planning a trip? Check special fishing regulations for Sullivan Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Minnesota regulations index.

Fishing in Morrison County

Morrison County Fishing Guide

Fish species and best-graded lakes in Morrison County

DNR Reports (40)

Minnesota DNR LakeFinder resources for lakes in Morrison County. browse all reports →

These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).

All Lakes in Morrison County

16 lakes · 8 graded, 8 not rated8 graded lakes · 8 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicMax DepthAccess
1ASullivan LakeMorrisonA10.8 ft14 µg/L5 µg/LNo recent samples57 ft✓ Public
2ACedar LakeMorrisonA16.2 ft10.5 µg/L1.7 µg/LNo recent samples88 ft✓ Public
3AAlexander LakeMorrisonA16.5 ft16 µg/L2.7 µg/LNo recent samples64 ft✓ Public
4AShamineau LakeMorrisonA12.5 ft14 µg/L4 µg/LNo recent samples52 ft✓ Public
5APine LakeMorrisonA15.1 ft14 µg/L3.6 µg/LNo recent samples59 ft✓ Public
6AFish Trap LakeMorrisonA9.7 ft22 µg/L7 µg/LNo recent samples42 ft✓ Public
7APierz LakeMorrisonA9.5 ft18 µg/L5.6 µg/LNo recent samples34 ft✓ Public
8CCrookneck LakeMorrisonC11.2 ft22 µg/L8.2 µg/LNo recent samples22 ft✓ Public
NRRound LakeMorrisonNR9.5 ft21 µg/L3.7 µg/LNo recent samples20 ft✓ Public
NRUnnamed LakeMorrisonNR6.9 ftNo recent samples6.2 µg/LNo recent samplesNo recent samples✓ Public
NRRice LakeMorrisonNR2 ftNo recent samplesNo recent samplesNo recent samples8 ft✓ Public
NRGreen Prairie Fish LakeMorrisonNR8 ftNo recent samplesNo recent samplesNo recent samples22 ft✓ Public
NRFerrell LakeMorrisonNR9.8 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFosdick LakeMorrisonNR8.9 ftNo recent samples7.1 µg/LNo recent samplesNo recent samplesCarry-in
NRAlott LakeMorrisonNR10.2 ftNo recent samples6.2 µg/LNo recent samples34 ftCarry-in
NRPeavy LakeMorrisonNR13.6 ft8 µg/LNo recent samplesNo recent samples63 ft✓ Public

NR = not rated: the monitoring record does not meet the evidence bar for a grade. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.

Lake Match

Which lake suits how you actually use one?

Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of graded lakes that fit, with the water quality behind each one.

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Other Counties in Minnesota

Clay County

2 lakes · Avg grade A

Hubbard County

76 lakes · Avg grade A

Cass County

130 lakes · Avg grade A

Cook County

139 lakes · Avg grade A

Crow Wing County

121 lakes · Avg grade A

Otter Tail County

98 lakes · Avg grade B

See how Morrison 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.