Duchesne County Lake Quality
Utah, 23 lakes, average grade B (Good)
Duchesne County's 23 graded lakes fall in the moderate-density bracket for {{stateName}}. The county-level average smooths over real differences — a single agricultural watershed near the southwest corner can pull the average down even if the rest of the county runs clean. With an average grade of B, Duchesne County sits comfortably above the {{stateName}} 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. Nla Lake (A) is the cleanest in the county.
Quick Answers for Duchesne County
Planning a trip? Check special fishing regulations for Nla Lake — or check the official Utah fishing regulations.
All Lakes in Duchesne County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Nla Lake | A | 15.9 ft | - |
| 2 | Starvation Reservoir | A | 11.2 ft | - |
| 3 | Big Sand Wash Reservoir | A | 10.7 ft | - |
| 4 | Red Creek Reservoir | A | 14.4 ft | - |
| 5 | Nla Lake | B | 8.9 ft | - |
| 6 | Moon Lake | B | 9.5 ft | - |
| 7 | Upper Stillwater Reservoir | B | 8.7 ft | - |
| 8 | Nla Lake | C | 6.1 ft | - |
| 9 | Lake Canyon Lake | D | 5.7 ft | - |
Other Counties in Utah
See how Duchesne 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 Duchesne County
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Source: EPA National Aquatic Resource Surveys, 2026.