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

Hill County Lake Quality

Montana, 25 lakes, measured by Montana DEQ

There are 25 monitored lakes in Hill County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. The 25 monitored lakes in Hill 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 Hill County

Top-rated places to stay near Hill County

Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.

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Quick Answers for Hill County

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

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

All Lakes in Hill County

25 lakes · 0 ranked on readings, 25 without enough sampling0 lakes ranked on readings · 25 without enough sampling, hidden

#LakeClarityPhosphorusAlgaeTrophicMax DepthAccess
McKinnsey ReservoirHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Burkhartsmeyer ReservoirHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Hingham LakeHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lower LakeHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Bearpaw LakeHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Bailey ReservoirHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Sage LakeHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Dry LakeHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Chain of LakesHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Chain of LakesHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Fresno ReservoirHillNo recent samplesNo recent samplesNo recent samplesNo recent samples50 ftNot recorded
Sands LakeHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Halfway LakeHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Martin LakeHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Dry LakeHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Grassy LakeHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake ThibadeauHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
DiversionHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Mud LakeHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Mud LakeHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Mud LakeHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Mud LakeHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Mud LakeHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Grassy LakeHillNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Grassy LakeHillNo 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

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46 lakes

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38 lakes

Yellowstone County

6 lakes

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108 lakes

Big Horn County

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Lake County

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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.