Laramie County Lake Quality
Wyoming, 13 lakes, average grade C (Fair)
Laramie County has 13 monitored 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. 8 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. 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 (B) is the cleanest in the county.
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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
13 lakes · 8 graded, 5 not rated8 graded lakes · 5 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | BCrystal ReservoirLaramie | B | 11.6 ft | 10 µg/L | No recent samples | No recent samples | ✓ Public |
| 2 | BGranite Springs ReservoirLaramie | B | 11.8 ft | 10 µg/L | No recent samples | No recent samples | ✓ Public |
| 3 | BLower North Crow ReservoirLaramie | B | 9.4 ft | 20 µg/L | No recent samples | No recent samples | Not recorded |
| 4 | BLake AbsarracaLaramie | B | 3.4 ft | 10 µg/L | No recent samples | No recent samples | ✓ Public |
| 5 | BUpper North Crow ReservoirLaramie | B | No recent samples | 20 µg/L | No recent samples | No recent samples | Not recorded |
| 6 | CSouth Crow ReservoirLaramie | C | No recent samples | 30 µg/L | No recent samples | No recent samples | Not recorded |
| 7 | DSloans LakeLaramie | D | 2 ft | 46.7 µg/L | No recent samples | No recent samples | ✓ Public |
| 8 | DHereford ReservoirLaramie | D | 3.7 ft | 860 µg/L | No recent samples | No recent samples | Not recorded |
| NRPole Creek ReservoirLaramie | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRPolaris ReservoirLaramie | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRValley ReservoirLaramie | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRSwan ReservoirLaramie | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRWyoming Hereford Ranch Reservoir Number OneLaramie | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
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
See how Laramie 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.