Flaming Gorge-Green River Lake
Daggett County, UtahView mapDirections
Not enough samples to grade — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. No letter yet. Here is what we do have.
- Limited data
Flaming Gorge-Green River Lake in Daggett County, Utah is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 18.9 ft visibility. Chlorophyll-a (algae): 0.8 µg/L.
- Clarity
- 18.9 ft
- Chlorophyll-a
- 0.8 µg/L
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Why Flaming Gorge-Green River Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Flaming Gorge-Green River Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity and algae (chlorophyll-a), but not phosphorus.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by Utah DWQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Flaming Gorge-Green River Lake is a lake in Daggett County, Utah.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2016-07-06. Grade methodology: LakeQuality methodology.
What Flaming Gorge-Green River Lake is good for
From access and monitoring records, not editorial picks.
- Clear water18.9 ft of visibility
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Flaming Gorge-Green River Lake
These readings exist but are not enough for an A–F grade — see why.
Crystal clear, you can see 18.9 ft down. Chlorophyll-a 0.8 µg/L. TSI 31.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 18.9 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 0.8 µg/L | Not graded |
| Trophic State Index (TSI) | 31 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Flaming Gorge-Green River Lake
Graded lakes near Flaming Gorge-Green River Lake
Flaming Gorge-Green River Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Daggett County
Frequently asked questions about Flaming Gorge-Green River Lake
Where is Flaming Gorge-Green River Lake?
- Flaming Gorge-Green River Lake is a lake in Daggett County, Utah. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Flaming Gorge-Green River Lake?
- Flaming Gorge-Green River Lake in Daggett County, Utah is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 18.9 ft visibility. Chlorophyll-a (algae): 0.8 µg/L.
Is Flaming Gorge-Green River Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Flaming Gorge-Green River Lake across LakeQuality
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Where this data comes from
61 measurements from 2 monitoring stations, 2012–2016. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- UC Region of USBOR
UC_REGION_USBOR_WQX61 samples · 2012–2016
Analytical methods
- Standard Methods for the Examination of Water and Wastewater
Monitoring station identifiers (2)
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.