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

Larimer County Lake Quality

Colorado, 91 lakes, measured by Colorado WQCD

Larimer County has 91 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. 8 of those lakes carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. The county-wide picture is low-to-moderate phosphorus with clear summer transparency across most monitored lakes.

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. Lon Hagler Reservoir has the lowest nutrient and algae readings in the county.

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Where to stay near Larimer County

Top-rated places to stay near Larimer County

Prices for Oct 23–25, 4 adults. Change dates on the map below.

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Quick Answers for Larimer County

Cleanest lakes in Larimer County →Cleanest lakes in Colorado →Best swimming lakes in Colorado →

Planning a trip? Check special fishing regulations for Lon Hagler Reservoir — or check the official Colorado fishing regulations.

All Lakes in Larimer County

91 lakes · 8 ranked on readings, 83 without enough sampling8 lakes ranked on readings · 83 without enough sampling, hidden

#LakeClarityPhosphorusAlgaeTrophicMax DepthAccess
1Lon Hagler ReservoirLarimer4.6 ft20 µg/L3.8 µg/LNo recent samplesNo recent samples✓ Public
2Boyd LakeLarimer4.6 ft20 µg/L5.1 µg/LNo recent samplesNo recent samples✓ Public
3Douglas ReservoirLarimer4.1 ft11 µg/L2.5 µg/LNo recent samplesNo recent samples✓ Public
4Chambers LakeLarimer5.1 ft11.5 µg/L5 µg/LNo recent samplesNo recent samplesNot recorded
5The Loch Hypolimnion LakeLarimerNo recent samplesNo recent samples2.8 µg/LNo recent samplesNo recent samplesNot recorded
6The Loch Surface LakeLarimerNo recent samplesNo recent samples3.4 µg/LNo recent samplesNo recent samplesNot recorded
7Dowdy LakeLarimer8.2 ft11.5 µg/L6.2 µg/LNo recent samplesNo recent samplesNot recorded
8Sky Pond HypolimnionLarimerNo recent samplesNo recent samples4.1 µg/LNo recent samplesNo recent samplesNot recorded
Timnath ReservoirLarimer5.6 ft16.5 µg/L10.7 µg/LNo recent samplesNo recent samplesNot recorded
Carter ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Eaton ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Johnson ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Upper Camp LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Panhandle ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Hiawatha LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Comanche ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Laramie LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Barnes Meadow ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Peterson LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Joe Wright ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Long Draw ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Hourglass ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Crystal LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Inkwell LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Arrowhead LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Blue Mountain ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Pinewood LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Flatiron ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Mariano ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Hertha ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Coleman ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lonetree ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Handy ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Loveland ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Berthoud ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Sunnyslope ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Bacon LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Chapman ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
South Side ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Ryan Gulch ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Rist Benson ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Cemetery LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake LovelandLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Houts ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Equalizer LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Heinricy LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Upper Hoffman LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Westerdoll LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Horseshoe LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Nelson ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Duck LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Donath LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
George Rist ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake EstesLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samples45 ftNot recorded
Marys LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samples33 ftNot recorded
Parvin LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Seaman ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Park Creek ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Boxelder Reservoir Number ThreeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Wasson ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Miners LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Dry Creek ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Bee LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Demmel LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Windsor ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Elder ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lindenmeier LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Long PondLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Richard Lake Reservoir Number SixLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Terry LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Dixon ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Kluver ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Curtis LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Watson LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Claymore LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
College LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Horsetooth ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samples200 ftNot recorded
Dixon ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Robert Benson LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Nelson ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Warren LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Portner ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Fossil Creek ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Kitchel LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
South Gray ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
North Gray ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Cobb LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Hinkley LakeLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Clark ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Indian Creek ReservoirLarimerNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Halligan ReservoirLarimerNo 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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Browse every Colorado 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 Water Quality Control Division of the Colorado Department of Public Health and Environment. See data sources.