Sanpete County Lake Quality
Utah, 13 lakes, average grade B (Good)
Sanpete 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. 5 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. With an average grade of B, Sanpete County sits comfortably above the Utah median.
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. Ferron Reservoir (A) is the cleanest in the county.
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Quick Answers for Sanpete County
Planning a trip? Check special fishing regulations for Ferron Reservoir — or check the official Utah fishing regulations.
All Lakes in Sanpete County
13 lakes · 5 graded, 8 not rated5 graded lakes · 8 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | AFerron ReservoirSanpete | A | 19 ft | 9.8 µg/L | 1.1 µg/L | No recent samples | ✓ Public |
| 2 | APalisade LakeSanpete | A | 5.1 ft | 14.7 µg/L | 1.6 µg/L | No recent samples | Not recorded |
| 3 | ANine Mile ReservoirSanpete | A | 9.3 ft | 13 µg/L | 2.5 µg/L | No recent samples | Not recorded |
| 4 | CLower Gooseberry ReservoirSanpete | C | 7.4 ft | 34 µg/L | 3.3 µg/L | No recent samples | Not recorded |
| 5 | CGunnison ReservoirSanpete | C | 0.8 ft | 113.5 µg/L | 8.2 µg/L | No recent samples | Not recorded |
| NRJet Fox ReservoirSanpete | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRIsland LakeSanpete | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRSpinners ReservoirSanpete | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRJulius Flat ReservoirSanpete | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRHenningson ReservoirSanpete | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NROlsen SloughSanpete | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRWales ReservoirSanpete | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRRolfson ReservoirSanpete | 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 Sanpete 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.