Daggett County Lake Quality
Utah, 7 lakes, average grade B (Good)
Daggett County has 7 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. 4 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. 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 Flaming Gorge Reservoir Antelope Flat (A); the most-stressed is Browne Lake (D).
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Quick Answers for Daggett County
Planning a trip? Check special fishing regulations for Flaming Gorge Reservoir Antelope Flat — or check the official Utah fishing regulations.
All Lakes in Daggett County
7 lakes · 4 graded, 3 not rated4 graded lakes · 3 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | AFlaming Gorge Reservoir Antelope FlatDaggett | A | 25.3 ft | 6.5 µg/L | 1 µg/L | No recent samples | Not recorded |
| 2 | AFlaming Gorge ReservoirDaggett | A | 31.8 ft | 6.8 µg/L | 1 µg/L | No recent samples | Not recorded |
| 3 | CSheep Creek LakeDaggett | C | 10.3 ft | 18.7 µg/L | 3 µg/L | No recent samples | ✓ Public |
| 4 | DBrowne LakeDaggett | D | 6.6 ft | 46.5 µg/L | 3.9 µg/L | No recent samples | ✓ Public |
| NRFlaming Gorge-Green River LakeDaggett | NR | 18.9 ft | No recent samples | 0.8 µg/L | No recent samples | Not recorded | |
| NRLong Park ReservoirDaggett | NR | 6.2 ft | 12.9 µg/L | 6.1 µg/L | No recent samples | ✓ Public | |
| NRDaggett LakeDaggett | 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 Daggett 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.