Sanpete County Lake Quality
Utah, 13 lakes, average grade B (Good)
Sanpete County has 13 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-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 Ferron Reservoir (A); the most-stressed is Gunnison Reservoir (C).
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
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Ferron Reservoir | A | 19 ft | - |
| 2 | Nla Lake | A | 14.5 ft | - |
| 3 | Nla Lake | A | 11.3 ft | - |
| 4 | Lower Gooseberry Reservoir | B | 7.4 ft | - |
| 5 | Nine Mile Reservoir | B | 9.3 ft | - |
| 6 | Palisade Lake | B | 5.1 ft | - |
| 7 | Nla Lake | C | 2.6 ft | - |
| 8 | Gunnison Reservoir | C | 0.8 ft | - |
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 34 states.
Where to stay near Sanpete County
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Source: EPA National Aquatic Resource Surveys, 2026.