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LakeQuality
Late afternoon sun over Slim Lake, scattering a bright path across wind-textured water

Marshall County Lake Quality

Minnesota, 12 lakes, measured by Minnesota PCA

Marshall County has 12 monitored lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. The 12 monitored lakes in Marshall County carry whatever clarity, phosphorus, and chlorophyll-a readings Minnesota PCA has published, shown as reported.

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.

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Where to stay near Marshall County

Top-rated places to stay near Marshall County

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Quick Answers for Marshall County

Cleanest lakes in Marshall County →Cleanest lakes in Minnesota →Best swimming lakes in Minnesota →

Planning a trip? Check special fishing regulations for Wb-A Agassiz Nwr Lake — or browse the full Minnesota regulations index.

All Lakes in Marshall County

12 lakes · 0 ranked on readings, 12 without enough sampling0 lakes ranked on readings · 12 without enough sampling, hidden

#LakeClarityPhosphorusAlgaeTrophicAccess
Wb-A Agassiz Nwr LakeMarshallNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Wb-B Agassiz Nwr LakeMarshallNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Horseshoe LakeMarshallNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Thief LakeMarshallNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Middle CCC PoolMarshallNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Kuriko LakeMarshallNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Headquarters PoolMarshallNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Northwest PoolMarshallNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Thief Bay PoolMarshallNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Webster Creek PoolMarshallNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
East Olson LakeMarshallNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Tamarack PoolMarshallNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded

NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.

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Other Counties in Minnesota

Clay County

43 lakes

Morrison County

52 lakes

Hubbard County

178 lakes

Cass County

397 lakes

Cook County

469 lakes

Crow Wing County

320 lakes

Browse every Minnesota lake, or the full directory of lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..

Source: the Minnesota Pollution Control Agency and the Minnesota DNR. See data sources.