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

Madison County Lake Quality

Montana, 11 lakes, measured by Montana DEQ

Madison County has 11 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 11 monitored lakes in Madison County carry whatever clarity, phosphorus, and chlorophyll-a readings Montana DEQ 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 Madison County

Top-rated places to stay near Madison County

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Quick Answers for Madison County

Cleanest lakes in Madison County →Cleanest lakes in Montana →Best swimming lakes in Montana →

Planning a trip? Check special fishing regulations for Hidden Lake — or check the official Montana fishing regulations.

All Lakes in Madison County

11 lakes · 0 ranked on readings, 11 without enough sampling0 lakes ranked on readings · 11 without enough sampling, hidden

#LakeClarityPhosphorusAlgaeTrophicMax DepthAccess
Hidden LakeMadisonNo recent samplesNo recent samplesNo recent samplesNo recent samples72 ftNot recorded
Earthquake LakeMadisonNo recent samplesNo recent samplesNo recent samplesNo recent samples120 ftNot recorded
Wade LakeMadisonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Cliff LakeMadisonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Cedar LakeMadisonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Ennis LakeMadisonNo recent samplesNo recent samplesNo recent samplesNo recent samples20 ftNot recorded
South Meadow Creek LakeMadisonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Twin LakesMadisonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Ruby River ReservoirMadisonNo recent samplesNo recent samplesNo recent samplesNo recent samples28 ftNot recorded
Cataract LakeMadisonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Willow Creek ReservoirMadisonNo recent samplesNo 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 Montana

Missoula County

46 lakes

Carbon County

38 lakes

Yellowstone County

6 lakes

Flathead County

108 lakes

Big Horn County

4 lakes

Lake County

38 lakes

Browse every Montana 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 Montana Department of Environmental Quality. See data sources.