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

Montana, 70 lakes — no lake here has enough monitoring data for a grade

Glacier County has 70 monitored lakes, enough that within-county variation matters as much as the county average. Some are deep glacial basins, others are shallow agricultural-watershed waters, and the measurements reflect that mix. No lake in Glacier County has enough sampling behind it for an A–F grade yet. The 70 monitored lakes below carry whatever clarity, phosphorus, and chlorophyll-a measurements exist.

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 Glacier County

Top-rated places to stay near Glacier County

Prices for Sep 11–13, 4 adults. Change dates on the map below.

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Quick Answers for Glacier County

Cleanest lakes in Glacier County →Cleanest lakes in Montana →Safest swimming lakes in Montana →

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

All Lakes in Glacier County

70 lakes · 0 graded, 70 not rated0 graded lakes · 70 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
NRKipp LakeGlacierNRNo recent samples253 µg/LNo recent samplesNo recent samplesNot recorded
NRIceberg LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRIpasha LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHelen LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMokowanis LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMargaret LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSue LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBench LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRedhorn LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRNahsukin LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCarcajou LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake FrancesGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake WurdemanGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake NooneyGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRKootenai LakesGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake JanetGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRUpper Waterton LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMiche Wabun LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCosley LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGlenns LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSlide LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGoose LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSpider LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPike LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCroffs LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLukins LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBoundary LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHay LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGrassy LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRAllison LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHope LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCarlow LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMission LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGuardipee LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRUpper Mission LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBuffalo LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLittle Buffalo LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSharp LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHorse LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRToad LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDuck LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLower Saint Mary LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPoia LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRElizabeth LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRKennedy LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRedrock LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBullhead LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake JosephineGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSwiftcurrent LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake SherburneGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRUpper Grinnell LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGrinnell LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCracker LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGoat LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSaint Mary LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMedicine Owl LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRed Eagle LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGunsight LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRYoung Man LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NROldman LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMedicine Grizzly LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPitamakan LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTwo Medicine LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRLower Two Medicine LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMagee LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMinnie White Horse LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDog Gun LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBig Spring LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRUpper Two Medicine LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFour Horns LakeGlacierNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded

NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.

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Other Counties in Montana

Missoula County

46 lakes · Avg grade B

Carbon County

38 lakes · Avg grade B

Yellowstone County

6 lakes · Avg grade B

Flathead County

108 lakes · Avg grade B

Big Horn County

4 lakes · Avg grade C

Lake County

38 lakes · Avg grade C

See how Glacier County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..

Source: EPA National Aquatic Resource Surveys, 2026.