Cleanest Lakes in Wyoming
Flaming Gorge Reservoir in Sweetwater County leads the rankings with a water quality grade of A and 22 ft of clarity. Below are the top 50 cleanest monitored lakes in Wyoming, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Flaming Gorge Reservoir | Sweetwater | A | 22 ft | 11 µg/L | 1.1 µg/L |
| 2 | Nla Lake | Sublette | A | 25.3 ft | 7.7 µg/L | 0.8 µg/L |
| 3 | Flaming Gorge-Green River Lake | Sweetwater | A | 18.4 ft | - | 2.2 µg/L |
| 4 | Fontenelle Reservoir | Lincoln | A | 15 ft | 15 µg/L | - |
| 5 | Fremont Lake | Sublette | A | 42.8 ft | 10 µg/L | - |
| 6 | Worthen Meadows Reservoir | Fremont | A | 15.9 ft | 10 µg/L | - |
| 7 | Flaming Gorge Res Bl Buckboard Replicate of Lake | Sweetwater | A | 12.6 ft | 7 µg/L | 1.2 µg/L |
| 8 | Fontenelle Reservoir | Lincoln | A | 13.3 ft | - | 2.9 µg/L |
| 9 | Fontenelle Reservoir Lower-Mid | Lincoln | A | 11.8 ft | - | 4.3 µg/L |
| 10 | Seminoe Reservoir Lacustrine Pelagic | Carbon | A | 17.1 ft | 25 µg/L | - |
| 11 | Viva Naughton Reservoir Lpd | Lincoln | A | 12.3 ft | 18.7 µg/L | - |
| 12 | Crystal Reservoir | Laramie | A | 11.6 ft | 10.3 µg/L | - |
| 13 | Granite Springs Reservoir | Laramie | A | 11.8 ft | 10.3 µg/L | - |
| 14 | Kleenburn Pond | Sheridan | A | 11.5 ft | 15 µg/L | - |
| 15 | Rob Roy Reservoir | Albany | A | 11.2 ft | 10 µg/L | - |
| 16 | Tie Hack Reservoir | Johnson | A | 12.9 ft | 10 µg/L | - |
| 17 | Healy Reservoir | Johnson | A | 15.3 ft | 20 µg/L | - |
| 18 | Bell Reservoir | Albany | A | 10.3 ft | 15 µg/L | - |
| 19 | Morrison Reservoir | Platte | A | 14.4 ft | 10 µg/L | - |
| 20 | Lower Sunshine Reservoir | Park | A | 10.6 ft | 10 µg/L | - |
| 21 | Nla Lake | Johnson | B | 7.1 ft | 18 µg/L | 1.7 µg/L |
| 22 | Fontenelle Reservoir Caseknife Canyon | Lincoln | B | 9.5 ft | - | 4.7 µg/L |
| 23 | Nla Lake | Albany | B | 8.6 ft | 23.8 µg/L | 2.6 µg/L |
| 24 | Nla Lake | Albany | B | 12.6 ft | 40.2 µg/L | 2.1 µg/L |
| 25 | Pathfinder Reservoir Lacustrine Pelagic | Natrona | B | 10.7 ft | 20 µg/L | - |
| 26 | Alcova Reservoir Transitional Pelagic | Natrona | B | 11.3 ft | 20 µg/L | - |
| 27 | Pathfinder Reservoir Transitional Pelagic | Natrona | B | 11.1 ft | 20 µg/L | - |
| 28 | Seminoe Reservoir Transitional Littoral | Carbon | B | 7.1 ft | 10 µg/L | - |
| 29 | Alcova Reservoir Lacustrine Pelagic | Natrona | B | 12.8 ft | 20 µg/L | - |
| 30 | Pathfinder Reservoir Transitional Littoral | Natrona | B | 7.7 ft | 15 µg/L | - |
| 31 | Seminoe Reservoir Transitional Pelagic | Carbon | B | 11.4 ft | 20 µg/L | - |
| 32 | Keyhole Reservoir | Crook | B | 10.6 ft | 20 µg/L | - |
| 33 | Lake Owen | Albany | B | 8.1 ft | 10 µg/L | - |
| 34 | Muddy Guard Reservoir | Johnson | B | 15.2 ft | 30 µg/L | - |
| 35 | Lake Cameahwait | Fremont | B | 11.6 ft | 20 µg/L | - |
| 36 | Boysen Reservoir | Fremont | B | 11.5 ft | 20 µg/L | - |
| 37 | Boysen Reservoir Transitional Embayment | Fremont | B | 11 ft | 20 µg/L | - |
| 38 | Nla Lake | Fremont | B | 19.6 ft | 14000 µg/L | 2.6 µg/L |
| 39 | Nla Lake | Sublette | B | 35.4 ft | 12000 µg/L | 0.6 µg/L |
| 40 | Nla Lake | Teton | B | 26.9 ft | 42000 µg/L | 0.6 µg/L |
| 41 | Nla Lake | Carbon | B | 19.5 ft | 3512.4 µg/L | 2.4 µg/L |
| 42 | Nla Lake | Teton | B | 38.1 ft | 4501.1 µg/L | 0.6 µg/L |
| 43 | Nla Lake | Johnson | B | 31 ft | 7502.8 µg/L | 1 µg/L |
| 44 | Nla Lake | Sublette | B | 18.6 ft | 14503.7 µg/L | 2.5 µg/L |
| 45 | Alcova Reservoir Transitional Littoral | Natrona | B | 5.2 ft | 15 µg/L | - |
| 46 | Glendo Reservoir Lacustrine Embayment | Platte | B | 7.4 ft | 20 µg/L | - |
| 47 | Seminoe Reservoir Pelagic | Carbon | B | 8.5 ft | 20 µg/L | - |
| 48 | Pathfinder Reservoir Lacustrine Littoral | Natrona | B | 7.8 ft | 20 µg/L | - |
| 49 | Glendo Reservoir Lacustrine Littoral | Platte | B | 6.6 ft | 20 µg/L | - |
| 50 | Seminoe Reservoir Lacustrine Littoral | Carbon | B | 11.7 ft | 30 µg/L | - |