Mesotrophic Lakes in Wyoming
21 mesotrophic lakes in Wyoming. Moderate nutrients, good water quality.
Most well-managed working lakes register as mesotrophic — the band that balances productivity with clarity. 21 lakes in Wyoming sit in the mesotrophic band. About 0% are deep (50+ ft); the rest are shallower basins where watershed management keeps nutrients from pushing the system into eutrophy.
Mesotrophic lakes tend to grade B or C on our A–F scale — the productive-but-clear band lines up with the middle of the letter grades.
| # | Lake | County | Grade | Clarity | Depth | TSI |
|---|---|---|---|---|---|---|
| 1 | Alcova Reservoir Transitional Pelagic | Natrona | B | 11.3 ft | - | 45 |
| 2 | Alcova Reservoir Lacustrine Pelagic | Natrona | B | 12.8 ft | - | 44 |
| 3 | Seminoe Reservoir Transitional Pelagic | Carbon | B | 11.4 ft | - | 45 |
| 4 | Wheatland Reservoir | Platte | B | 8.9 ft | - | 46 |
| 5 | Keyhole Reservoir | Crook | B | 7.7 ft | - | 48 |
| 6 | Lake Owen | Albany | B | 8.1 ft | - | 42 |
| 7 | Sibley Lake | Sheridan | B | 9.2 ft | - | 41 |
| 8 | Park Reservoir | Sheridan | B | 10.8 ft | - | 40 |
| 9 | Lake Hattie | Albany | B | 8.4 ft | - | 42 |
| 10 | Upper New Fork Lake | Sublette | B | 10.5 ft | - | 40 |
| 11 | Healy Reservoir | Johnson | B | 15.3 ft | - | 43 |
| 12 | Bell Reservoir | Albany | B | 10.3 ft | - | 40 |
| 13 | Jordan Reservoir | Platte | B | 5 ft | - | 46 |
| 14 | Lower North Crow Reservoir | Laramie | B | 9.4 ft | - | 46 |
| 15 | Lower Sunshine Reservoir | Park | B | 10.6 ft | - | 40 |
| 16 | Frye Lake | Fremont | B | 8.4 ft | - | 42 |
| 17 | Lake Absarraca | Laramie | B | 3.4 ft | - | 48 |
| 18 | Deaver Reservoir -D | Park | B | - | - | 47 |
| 19 | Sawmill Reservoir D | Sheridan | B | - | - | 47 |
| 20 | Upper North Crow Reservoir | Laramie | B | - | - | 47 |
| 21 | Rawlins Peaking Reservoir | Carbon | B | - | - | 47 |
All mesotrophic lakes →Minnesota version →Wisconsin version →Illinois version →Michigan version →Iowa version →Ohio version →Pennsylvania version →New York version →Missouri version →Indiana version →North Dakota version →South Dakota version →Florida version →Colorado version →North Carolina version →Vermont version →Texas version →Oregon version →Arkansas version →Oklahoma version →Kansas version →Nebraska version →Nevada version →Arizona version →Idaho version →Montana version →New Mexico version →Tennessee version →Alabama version →Virginia version →Kentucky version →Utah version →Washington version →Georgia version →Massachusetts version →Ontario version →Québec version →Nova Scotia version →British Columbia version →Newfoundland and Labrador version →All Wyoming lakes →
Source: EPA National Aquatic Resource Surveys, 2026.