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

Sublette County Lake Quality

Wyoming, 117 lakes, average grade B (Good)

Sublette County in Wyoming carries 117 monitored lakes — one of the lake-richer counties in our dataset. Coverage that dense usually reflects active lake-association sampling alongside state-agency monitoring. 5 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.

The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Half Moon Lake (B); the most-stressed is Half Moon Lake (B).

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Quick Answers for Sublette County

Cleanest lakes in Sublette County →Safest swimming lakes in Wyoming →

Planning a trip? Check special fishing regulations for Half Moon Lake — or check the official Wyoming fishing regulations.

All Lakes in Sublette County

117 lakes · 5 graded, 112 not rated5 graded lakes · 112 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
1BHalf Moon LakeSubletteB22.2 ft10 µg/LNo recent samplesNo recent samples✓ Public
2BLower New Fork LakeSubletteB22 ft10 µg/LNo recent samplesNo recent samples✓ Public
3BUpper New Fork LakeSubletteB10.5 ft10 µg/LNo recent samplesNo recent samplesNot recorded
4BBoulder LakeSubletteB27.7 ft10 µg/LNo recent samplesNo recent samples✓ Public
5BFremont LakeSubletteB42.8 ft10 µg/LNo recent samplesNo recent samplesNot recorded
NRPoison LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTayo LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCoon LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSheet LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLittle Sandy LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFrozen LakesSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRClear Lake ReservoirSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDeep LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTemple LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBlack Joe LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBig Sandy LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDads LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMarms LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBoulter ReservoirSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWolf LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRJunction LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDivide LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDream LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRaid LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCross LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSilver LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRShadow LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBillys LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBarren LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPyramid LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMays LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBonneville LakesSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRNoel LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLee LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBewmark LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRShoestring LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHalls LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMiddle Fork LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSunrise LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRainbow LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSandpoint LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHoward LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWilderness LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake WinonaSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake IsabellaSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRNorth Fork LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake PrueSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRValley LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLong LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake VictorSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGlacier LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRKevin LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBear LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDaphne LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRClear LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSlide LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBaker LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRIceberg LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRScott LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMarten LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRThomson LakesSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPeak LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMistake LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTitcomb LakesSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLower Jean LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRIsland LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWall LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSpider LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTimico LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBaldy LakesSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRChain LakesSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRChain LakesSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRChain LakesSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSpruce LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRJunction LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPole Creek LakesSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCook LakesSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSeneca LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGorge LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTriangle LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRUpper Long LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLittle Soda LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSection Corner LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTrapper LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLost LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRElbow LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSummit LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBorum LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWillow LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGreen River LakesSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRNorth Piney LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSoda LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRMud LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFayette LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLittle Half Moon LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMeadow LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBurnt LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBlueberry LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBarnes LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHidden LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake SurpriseSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHorseshoe LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake SequaSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRChris LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLovatt LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake EthelSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSoda LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWard Ball ReservoirSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRJuel ReservoirSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSixty-Seven ReservoirSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMiddle Piney LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBrewster LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDollar LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHorseshoe LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGranite LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDyke LakeSubletteNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDeep LakeSubletteNRNo 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 Wyoming

Johnson County

32 lakes · Avg grade B

Natrona County

36 lakes · Avg grade B

Crook County

9 lakes · Avg grade B

Sheridan County

11 lakes · Avg grade B

Albany County

67 lakes · Avg grade B

Platte County

19 lakes · Avg grade B

See how Sublette 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.