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

Carbon County Lake Quality

Wyoming, 71 lakes, average grade B (Good)

Carbon County in Wyoming carries 71 monitored lakes — one of the lake-richer counties in our dataset. Coverage that dense usually reflects active lake-association sampling alongside state-agency monitoring. 8 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. With an average grade of B, Carbon County sits comfortably above the Wyoming median.

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. Seminoe Reservoir Riverine Pelagic (B) is the cleanest in the county.

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Quick Answers for Carbon County

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

Planning a trip? Check special fishing regulations for Seminoe Reservoir Riverine Pelagic — or check the official Wyoming fishing regulations.

All Lakes in Carbon County

71 lakes · 8 graded, 63 not rated8 graded lakes · 63 not rated, hidden

Include not-rated lakes (63)

#	Lake	Grade	Clarity	Phosphorus	Algae	Trophic	Access
1	BSeminoe Reservoir Riverine PelagicCarbon	B	4.4 ft	30 µg/L	No recent samples	No recent samples	Not recorded
2	BSeminoe Reservoir Lacustrine PelagicCarbon	B	17.1 ft	15 µg/L	No recent samples	No recent samples	✓ Public
3	BSeminoe Reservoir Transitional PelagicCarbon	B	11.4 ft	20 µg/L	No recent samples	No recent samples	Not recorded
4	BHog Park ReservoirCarbon	B	17.9 ft	10 µg/L	No recent samples	No recent samples	✓ Public
5	BHanna ReservoirCarbon	B	No recent samples	10 µg/L	No recent samples	No recent samples	Not recorded
6	BHanna Water Supply LakeCarbon	B	No recent samples	10 µg/L	No recent samples	No recent samples	Not recorded
7	BRawlins Peaking ReservoirCarbon	B	No recent samples	20 µg/L	No recent samples	No recent samples	Not recorded
8	DRawlins ReservoirCarbon	D	No recent samples	60 µg/L	No recent samples	No recent samples	Not recorded
	NRSeminoe Reservoir Transitional LittoralCarbon	NR	7.1 ft	10 µg/L	No recent samples	No recent samples	Not recorded
	NRSeminoe Reservoir PelagicCarbon	NR	8.5 ft	15 µg/L	No recent samples	No recent samples	Not recorded
	NRSeminoe Reservoir Lacustrine LittoralCarbon	NR	11.7 ft	20 µg/L	No recent samples	No recent samples	Not recorded
	NRSeminoe Reservoir Riverine LittoralCarbon	NR	7.8 ft	20 µg/L	No recent samples	No recent samples	Not recorded
	NRSeminoe ReservoirCarbon	NR	No recent samples	40 µg/L	No recent samples	No recent samples	✓ Public
	NRWallis ReservoirCarbon	NR	No recent samples	20 µg/L	No recent samples	No recent samples	Not recorded
	NRTeton ReservoirCarbon	NR	No recent samples	50 µg/L	No recent samples	No recent samples	✓ Public
	NRAtlantic Rim ReservoirCarbon	NR	No recent samples	10 µg/L	No recent samples	No recent samples	Not recorded
	NRLittle Sage Creek ReservoirCarbon	NR	No recent samples	75 µg/L	No recent samples	No recent samples	Not recorded
	NRSaratoga ReservoirCarbon	NR	No recent samples	40 µg/L	No recent samples	No recent samples	✓ Public
	NRSederlin LakeCarbon	NR	No recent samples	50 µg/L	No recent samples	No recent samples	Not recorded
	NRWakan Tanka Lake DCarbon	NR	No recent samples	40 µg/L	No recent samples	No recent samples	Not recorded
	NREast Allen Lake DCarbon	NR	No recent samples	60 µg/L	No recent samples	No recent samples	✓ Public
	NRShirley Basin Reservoir DCarbon	NR	No recent samples	80 µg/L	No recent samples	No recent samples	Not recorded
	NRSpring Lake DCarbon	NR	No recent samples	100 µg/L	No recent samples	No recent samples	Not recorded
	NRPine Cone Reservoir DCarbon	NR	No recent samples	20 µg/L	No recent samples	No recent samples	Not recorded
	NRElk Mountain Reservoir DCarbon	NR	No recent samples	80 µg/L	No recent samples	No recent samples	Not recorded
	NRCoal Bank LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLittle Robber Detention DamCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRHigh Savery ReservoirCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NREightmile LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRHogback LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSeaverson ReservoirCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NREightmile LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRGovernment ReservoirCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRFivemile LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRMahoney LakesCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRDry LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSeparation LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBoggy Meadows LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLost Soldier LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSoda LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBucklin ReservoirsCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRFresh Water ReservoirCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRIrene ReservoirCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRGrinnell LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRKortes ReservoirCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRThe LakesCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRPine Draw LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRComo LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRPynchin LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRAllen LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRRed LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRAurora LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRHorne LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRIron Hill LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRMcFadden Reservoir Number ThreeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBosler ReservoirCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRPierce ReservoirCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRWhite ReservoirCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSevenmile LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRHorn and Meason ReservoirCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBuck Draw ReservoirCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRHaines ReservoirCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRAnderson ReservoirCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSouth Spring Creek LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRGunst ReservoirCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRDipper LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLong LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRTurpin ReservoirCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSand LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRDeep LakeCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRHog Park ReservoirCarbon	NR	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public

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

Sublette County

117 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

See how Carbon 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.