Uintah County Lake Quality
Utah, 32 lakes, average grade C (Fair)
Uintah County's 32 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. Uintah County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
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 Calder Reservoir (B); the most-stressed is Nla Lake (F).
Quick Answers for Uintah County
Planning a trip? Check special fishing regulations for Calder Reservoir — or check the official Utah fishing regulations.
All Lakes in Uintah County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Calder Reservoir | B | 8.9 ft | - |
| 2 | Paradise Park Reservoir | B | 7.9 ft | - |
| 3 | Steinaker Reservoir | B | 8.9 ft | - |
| 4 | Red Fleet Reservoir | B | 5.9 ft | - |
| 5 | Brough Reservoir | B | 6.2 ft | - |
| 6 | Nla Lake | C | 3.8 ft | - |
| 7 | Matt Warner Reservoir | C | 6.6 ft | - |
| 8 | Matt Warner Reservoir W | C | 6.2 ft | - |
| 9 | Oaks Park Reservoir | C | 3.3 ft | - |
| 10 | Matt Warner Reservoir E | C | 6.2 ft | - |
| 11 | East Park Reservoir | D | 4.6 ft | - |
| 12 | Nla Lake | D | 4.1 ft | - |
| 13 | Nla Lake | F | 0.7 ft | - |
Other Counties in Utah
See how Uintah 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 Uintah County
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Source: EPA National Aquatic Resource Surveys, 2026.