Flaming Gorge Reservoir
Daggett County, UtahView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Oligotrophic
- #3 of 7 in the county
Flaming Gorge Reservoir in Daggett County, Utah has a water quality grade of A (Excellent). Water clarity: 31.8 ft visibility. Phosphorus: 6.8 µg/L. Chlorophyll-a (algae): 1 µg/L.
- Clarity
- 31.8 ft
- Type
- Oligotrophic
- Phosphorus
- 6.8 µg/L
- Chlorophyll-a
- 1 µg/L
- Trend
- ↓ Declining
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Watch Flaming Gorge Reservoir’s letter
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Flaming Gorge Reservoir is a cold, clear oligotrophic lake in Daggett County, Utah. Water quality is graded A based on 2 sampling years through 2025. Overall water quality is declining over recent sampling years. Compared to the 6 other monitored lakes in Daggett County, Flaming Gorge Reservoir ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2025-07-10. Grade methodology: LakeQuality methodology.
What Flaming Gorge Reservoir is good for
From access and monitoring records, not editorial picks.
- Clear water31.8 ft of visibility
- Camping1 public campground nearby
Swimming Safety
Grade onlyLow algae
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Crystal clear, you can see 31.8 ft down. Phosphorus 6.8 µg/L. Chlorophyll-a 1 µg/L. TSI 30. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 31.8 ft | Not graded |
| Phosphorus | 6.8 µg/L | Good |
| Chlorophyll-a (Algae) | 1 µg/L | Good |
| Trophic State Index (TSI) | 30 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Recreation & Access
Public campgrounds near Flaming Gorge Reservoir
- Kingfisher Island1.3 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Fishing Flaming Gorge Reservoir
Water Quality Trend: ↓ Declining
Based on 10 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.089 m/yr | 10 |
| Phosphorus | ↓ Declining | +8.4 µg/L/yr | 2 |
| Chlorophyll-a | ↓ Declining | +0.05 µg/L/yr | 4 |
County Ranking
Ranked #3 of 7 lakes in Daggett County
Nearby Lakes in Daggett County
Frequently asked questions about Flaming Gorge Reservoir
Where is Flaming Gorge Reservoir?
- Flaming Gorge Reservoir is a lake in Daggett County, Utah. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Flaming Gorge Reservoir?
- Flaming Gorge Reservoir in Daggett County, Utah has a water quality grade of A (Excellent). Water clarity: 31.8 ft visibility. Phosphorus: 6.8 µg/L. Chlorophyll-a (algae): 1 µg/L.
Is Flaming Gorge Reservoir safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Are there campgrounds on Flaming Gorge Reservoir?
- Flaming Gorge Reservoir has 1 public campground from USGS The National Map within 5 km, including Kingfisher Island. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
Explore Flaming Gorge Reservoir across LakeQuality
Species activity outlook by water temperature and season
Where to stay at Utah's top lakes, each with its grade
Low nutrients, clear water. The letter is not a swimming clearance.
Utah's cleanest and most-polluted lakes, ranked
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Other Grade A Lakes in Utah
Oligotrophic Lakes in Utah
Where this data comes from
214 measurements from 4 monitoring stations, 2012–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX214 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 (4)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Public campgrounds from USGS The National Map Structures, within about 3 miles