Yellowstone Lake
Teton County, WyomingView mapDirections
Not Rated: two monitoring stations are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Limited data
Yellowstone Lake in Teton County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 28.7 ft visibility.
- Clarity
- 28.7 ft
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Watch Yellowstone Lake’s letter
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Why Yellowstone Lake has no grade
Yellowstone Lake has monitoring on record from two stations, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Yellowstone Lake is Not Rated — not an F. Its 28.7-foot median from 14 readings collected 2012–2013 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by Wyoming DEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Yellowstone Lake is a lake in Teton County, Wyoming.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2013-09-09. Grade methodology: LakeQuality methodology.
What Yellowstone Lake is good for
From access and monitoring records, not editorial picks.
- Clear water28.7 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 Yellowstone Lake
These readings exist but are not enough for an A–F grade — see why.
Crystal clear, you can see 28.7 ft down. TSI 29.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 28.7 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 29 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Yellowstone Lake
Nearby Lakes in Teton County
Frequently asked questions about Yellowstone Lake
Where is Yellowstone Lake?
- Yellowstone Lake is a lake in Teton County, Wyoming. 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 Yellowstone Lake?
- Yellowstone Lake in Teton County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 28.7 ft visibility.
Is Yellowstone Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Yellowstone Lake across LakeQuality
3 documented falls within 21.2 mi, nearest Lewis Falls
4 thermal springs within 10.8 mi, nearest Steamboat Springs
Species activity outlook by water temperature and season
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Where this data comes from
14 measurements from 2 monitoring stations, 2012–2013. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- National Park Service Water Resources Division
11NPSWRD_WQX14 samples · 2012–2013
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.