Flaming Gorge Reservoir Antelope Flat is a cold, clear oligotrophic lake in Daggett County, Utah. Water quality is graded A based on 2 sampling years through 2025. Compared to the 20 other monitored lakes in Daggett County, Flaming Gorge Reservoir Antelope Flat ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DNR, last sampled 2025-07-10. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 25.3 ft down. Chlorophyll-a: 0.7 µg/L. Trophic State Index: 29.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 25.3 ft | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 0.7 µg/L | A |
| Trophic State Index (TSI) | 29 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Flaming Gorge Reservoir Antelope Flat
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Fishing Flaming Gorge Reservoir Antelope Flat
Location
County Ranking
Ranked #1 of 21 lakes in Daggett County
Nearby Lakes in Daggett County
Explore Flaming Gorge Reservoir Antelope Flat across LakeGrade
More Utah Lake Rankings
Other Grade A Lakes in Utah
Oligotrophic Lakes in Utah
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-07-10
Monitoring stations: 1