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

Klamath County Lake Quality

Oregon, 90 lakes, measured by Oregon DEQ

Klamath County has 90 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. 11 of those lakes carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. Most monitored lakes in Klamath County are productive, shallow basins; each lake page shows its own phosphorus and chlorophyll-a readings beside the EPA condition class.

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. Crescent Lake has the lowest nutrient and algae readings in the county.

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Where to stay near Klamath County

Top-rated places to stay near Klamath County

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Quick Answers for Klamath County

Cleanest lakes in Klamath County →Cleanest lakes in Oregon →Best swimming lakes in Oregon →

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

All Lakes in Klamath County

90 lakes · 11 ranked on readings, 79 without enough sampling11 lakes ranked on readings · 79 without enough sampling, hidden

#LakeClarityPhosphorusAlgaeTrophicMax DepthAccess
1Crescent LakeKlamath42.2 ftNo recent samples1.2 µg/LNo recent samplesNo recent samples✓ Public
2Lake of the WoodsKlamathNo recent samplesNo recent samples1.2 µg/LNo recent samplesNo recent samples✓ Public
3Fourmile LakeKlamathNo recent samplesNo recent samples0.5 µg/LNo recent samplesNo recent samples✓ Public
4Odell LakeKlamath22.3 ft30 µg/L1.1 µg/LNo recent samplesNo recent samplesNot recorded
5Fremont Bridge LakeKlamathNo recent samples200 µg/LNo recent samplesNo recent samplesNo recent samples✓ Public
6Williamson River Outlet LakeKlamathNo recent samples165 µg/L67.9 µg/LNo recent samplesNo recent samplesNot recorded
7Mid-Trench LakeKlamathNo recent samples240 µg/L80.6 µg/LNo recent samplesNo recent samplesNot recorded
8Agency Lake SouthKlamathNo recent samples110 µg/L61.6 µg/LNo recent samplesNo recent samples✓ Public
9Shoalwater Bay LakeKlamathNo recent samples215 µg/L143.5 µg/LNo recent samplesNo recent samplesNot recorded
10Rattlesnake Point LakeKlamathNo recent samples185 µg/L124.5 µg/LNo recent samplesNo recent samplesNot recorded
11Mid-North LakeKlamathNo recent samples180 µg/L81.1 µg/LNo recent samplesNo recent samples✓ Public
Geary Bridge LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Upper Klamath Lake Howard BayKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Hawks LakeKlamathNo recent samples450 µg/LNo recent samplesNo recent samplesNo recent samplesNot recorded
Spring LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lost LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Upper Midway ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Dog Hollow ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Twenty One ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Bumphead ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Antelope ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Gerber Lower Division ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Grohs ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Willow Valley ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Threemile ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Copeland ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Boggs LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Long LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
McCoy ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Worlow ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Pope ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lone Pine ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Captain Jack LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Harpold ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Smith ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Randall ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Noble Reservoir Number OneKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Big Adobe ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
DeVaul LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Pankey LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Keno ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Mallory ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Dry LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Campbell ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Devil LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Little Fishhole Flat ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Wilson LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Gerber ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Round Valley ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Tull ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Obenchain ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Hyde ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
O'Connors Puddle ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Smokey LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Wild Billy LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Riddle FieldKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Muckney LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Horton ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Swan LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Alkali LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Short LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Worden ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Meadow LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lost River PoolKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Nuss LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake EwaunaKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Whiteline ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake HarrietteKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Aspen LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Oatman LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
John C Boyle ReservoirKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Buck LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Red LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Island LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Long LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
West Swan LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Grass LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Middle LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Crater LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samples1932 ftNot recorded
Miller LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Round LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Abraham FlatKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Millhayes MeadowKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Gordon LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Gilchrist Log PondKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Yoran LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lower Rosary LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Fawn LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Oldenburg LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Summit LakeKlamathNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public

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 Oregon 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 Oregon Department of Environmental Quality. See data sources.