Upper Brooks Lake
Fremont County, WyomingView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Limited data
Upper Brooks Lake in Fremont County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 80 µg/L.
- Phosphorus
- 80 µg/L
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Watch Upper Brooks Lake’s letter
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Why Upper Brooks 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 Upper Brooks Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
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 Wyoming DEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Upper Brooks Lake is a lake in Fremont County, Wyoming.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2012-09-12. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Upper Brooks Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 80 µg/L. TSI 67.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 80 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 67 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Upper Brooks Lake
Nearby Lakes in Fremont County
Frequently asked questions about Upper Brooks Lake
Where is Upper Brooks Lake?
- Upper Brooks Lake is a lake in Fremont County, Wyoming. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Upper Brooks Lake?
- Upper Brooks Lake in Fremont County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 80 µg/L.
Is Upper Brooks Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Upper Brooks Lake across LakeQuality
Planning a trip around Grand Teton?
Upper Brooks Lake is about 35 miles from Grand Teton National Park. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Grand Teton →More Wyoming Lake Rankings
Other Lakes in Wyoming
Eutrophic Lakes in Wyoming
Where this data comes from
3 measurements from 1 monitoring station, 2012. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- State of Wyoming Department of Environmental Quality Watershed Program
WYDEQ_WATERSHED3 samples · 2012
Analytical methods
- Total Phosphorus After Block Digestion
Monitoring station identifiers (1)
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.