Beaver County Lake Quality
Utah, 5 lakes, average grade C (Fair)
Beaver County holds 5 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 3 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. Minersville Reservoir (C) is the cleanest in the county.
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Quick Answers for Beaver County
Planning a trip? Check special fishing regulations for Minersville Reservoir — or check the official Utah fishing regulations.
All Lakes in Beaver County
5 lakes · 3 graded, 2 not rated3 graded lakes · 2 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | CMinersville ReservoirBeaver | C | 2.6 ft | 99 µg/L | 4.6 µg/L | No recent samples | ✓ Public |
| 2 | CThree Creeks ReservoirBeaver | C | 6.6 ft | 32.5 µg/L | 3.7 µg/L | No recent samples | Not recorded |
| 3 | DAnderson Meadow ReservoirBeaver | D | 10.2 ft | 34.5 µg/L | 5.3 µg/L | No recent samples | Not recorded |
| NRRobinson-Tanner ReservoirBeaver | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLower Big Wash ReservoirBeaver | 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 Utah
See how Beaver 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.