Flaming Gorge Reservoir Antelope Flat
Daggett County, UtahView mapDirections
This is the name Utah DWQ records for this water. It can describe one sampling location rather than the water as a whole.
Utah DWQ publishes the water-quality measurements for Flaming Gorge Reservoir Antelope Flat. Here is what has been measured.
- Oligotrophic
- Impaired · pH / acidity
Flaming Gorge Reservoir Antelope Flat in Daggett County, Utah has water-quality measurements published by Utah DWQ, shown here as reported. Water clarity: 25.3 ft visibility. Phosphorus: 6.5 µg/L. Chlorophyll-a (algae): 1 µg/L.
Flaming Gorge Reservoir Antelope Flat is a cold, clear oligotrophic lake in Daggett County, Utah. Overall water quality is declining over recent sampling years. Compared to the 6 other monitored lakes in Daggett County, Flaming Gorge Reservoir Antelope Flat ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2025-07-10. Methodology: how these readings are compared.
What Flaming Gorge Reservoir Antelope Flat is good for
From access and monitoring records, not editorial picks.
- Clear water25.3 ft of visibility
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Flaming Gorge Reservoir Antelope Flat is listed impaired under Clean Water Act §303(d) (IR 5) for pH / acidity. Check local advisories before you swim.
Whether Flaming Gorge Reservoir Antelope Flat is safe to swim in today is a call for the Utah Division of Water Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Flaming Gorge Reservoir Antelope Flat
These are the measurements Utah DWQ publishes for Flaming Gorge Reservoir Antelope Flat, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 25.3 ft down. Phosphorus 6.5 µg/L. Chlorophyll-a 1 µg/L. TSI 31.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 25.3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 6.5µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 1µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 31 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Flaming Gorge Reservoir Antelope Flat
Answers come straight from the public measurements and survey records on this page.
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Fishing Flaming Gorge Reservoir Antelope Flat
Water Quality Trend: Worsening
Based on 10 years of monitoring (2012–2025).
Water clarity
Stable10 years
Phosphorus
Worsening+0.8 µg/L/yr2 years
Chlorophyll-a
Worsening+0.04 µg/L/yr4 years
EPA Impairment Status
Flaming Gorge Reservoir Antelope Flat is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life.
Source: EPA ATTAINS assessment unit UT-L-14040106-021_00 · Official waterbody report
Nearby Lakes in Daggett County
Frequently asked questions about Flaming Gorge Reservoir Antelope Flat
Where is Flaming Gorge Reservoir Antelope Flat?
- Flaming Gorge Reservoir Antelope Flat is in Daggett County, Utah. This is the name Utah DWQ records for this water. It can describe one sampling location rather than the water as a whole. Its water-quality measurements are published by Utah DWQ and shown on this page as reported.
What is the water quality of Flaming Gorge Reservoir Antelope Flat?
- Flaming Gorge Reservoir Antelope Flat in Daggett County, Utah has water-quality measurements published by Utah DWQ, shown here as reported. Water clarity: 25.3 ft visibility. Phosphorus: 6.5 µg/L. Chlorophyll-a (algae): 1 µg/L.
Is Flaming Gorge Reservoir Antelope Flat safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Flaming Gorge Reservoir Antelope Flat is listed impaired under Clean Water Act §303(d) (IR 5) for pH / acidity. Check local advisories before you swim.
Explore Flaming Gorge Reservoir Antelope Flat across LakeQuality
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Where this data comes from
174 measurements from 1 monitoring station, 2012–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX174 samples · 2012–2025
Analytical methods
- Field Measurements
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- Turbidiy determined in the field
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database