Laramie County Lake Quality
Wyoming, 9 lakes, average grade C (Fair)
Laramie County has 9 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
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. Crystal Reservoir (A) is the cleanest in the county.
Quick Answers for Laramie County
Planning a trip? Check special fishing regulations for Crystal Reservoir — or check the official Wyoming fishing regulations.
All Lakes in Laramie County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Crystal Reservoir | A | 11.6 ft | 10.3 µg/L |
| 2 | Granite Springs Reservoir | A | 11.8 ft | 10.3 µg/L |
| 3 | Upper North Crow Reservoir | B | - | 20 µg/L |
| 4 | Lower North Crow Reservoir | B | 9.4 ft | 20 µg/L |
| 5 | Nla Lake | C | 7 ft | 1528000 µg/L |
| 6 | Lake Absarraca | C | 3.4 ft | 20 µg/L |
| 7 | South Crow Reservoir | C | - | 30 µg/L |
| 8 | Sloans Lake | D | 2 ft | 46.7 µg/L |
| 9 | Hereford Reservoir | D | 3.6 ft | 1115 µg/L |
Other Counties in Wyoming
See how Laramie 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 Laramie County
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Source: EPA National Aquatic Resource Surveys, 2026.