Johnson County Lake Quality
Wyoming, 8 lakes, average grade B (Good)
Only 8 lakes in Johnson County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. 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 Lake Desmet Lpd (A); the most-stressed is Camp Roberts Pond (C).
Quick Answers for Johnson County
Planning a trip? Check special fishing regulations for Lake Desmet Lpd — or check the official Wyoming fishing regulations.
All Lakes in Johnson County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lake Desmet Lpd | A | 39.1 ft | - |
| 2 | Lake Desmet Rtpd | A | 34.6 ft | - |
| 3 | Tie Hack Reservoir | A | 12.9 ft | 10 µg/L |
| 4 | Healy Reservoir | A | 15.3 ft | 20 µg/L |
| 5 | Nla Lake | B | 7.1 ft | 18 µg/L |
| 6 | Muddy Guard Reservoir | B | 15.2 ft | 30 µg/L |
| 7 | Nla Lake | B | 31 ft | 7502.8 µg/L |
| 8 | Camp Roberts Pond | C | 5.6 ft | 20 µg/L |
Other Counties in Wyoming
See how Johnson County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 34 states.
Where to stay near Johnson County
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Source: EPA National Aquatic Resource Surveys, 2026.