Yellowtail Reservoir Tpd
Big Horn 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
Yellowtail Reservoir Tpd in Big Horn County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 75 µg/L.
- Phosphorus
- 75 µg/L
- Trend
- → Stable
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Why Yellowtail Reservoir Tpd 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 Yellowtail Reservoir Tpd, 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.
Yellowtail Reservoir Tpd is a lake in Big Horn County, Wyoming.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2015-09-28. 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 Yellowtail Reservoir Tpd
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 75 µg/L. TSI 66.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 75 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 66 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Yellowtail Reservoir Tpd
Water Quality Trend: → Stable
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | → Stable | -0.11 µg/L/yr | 4 |
Graded lakes near Yellowtail Reservoir Tpd
Yellowtail Reservoir Tpd has no grade, but these lakes within a short drive do.
Nearby Lakes in Big Horn County
Frequently asked questions about Yellowtail Reservoir Tpd
Where is Yellowtail Reservoir Tpd?
- Yellowtail Reservoir Tpd is a lake in Big Horn 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 Yellowtail Reservoir Tpd?
- Yellowtail Reservoir Tpd in Big Horn County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 75 µg/L.
Is Yellowtail Reservoir Tpd safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Yellowtail Reservoir Tpd across LakeQuality
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Where this data comes from
2 measurements from 1 monitoring station, 2015. 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_WATERSHED2 samples · 2015
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.