Yellowtail Reservoir Rpd
Big Horn County, WyomingView mapDirections
Nutrients and algae run above the regional average.
↑ up from F at the last regrade
- Eutrophic
- #5 of 5 in the county
- Limited data
Yellowtail Reservoir Rpd in Big Horn County, Wyoming has a water quality grade of D (Nutrient-rich). Phosphorus: 95 µg/L.
- Type
- Eutrophic
- Phosphorus
- 95 µg/L
- Trend
- → Stable
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Stays near Yellowtail Reservoir Rpd
Compare lakeside cabins, hotels, and vacation rentals near Yellowtail Reservoir Rpd in Big Horn County, Wyoming — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Yellowtail Reservoir Rpd are listed below.
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Yellowtail Reservoir Rpd is a productive, nutrient-rich eutrophic lake in Big Horn County, Wyoming. Water quality is graded D based on 1 sampling years through 2016. Compared to the 4 other monitored lakes in Big Horn County, Yellowtail Reservoir Rpd ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2016-09-19. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
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 D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
No clarity data. Phosphorus 95 µg/L. TSI 70. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 95 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 70 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Yellowtail Reservoir Rpd
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 |
County Ranking
Ranked #5 of 5 lakes in Big Horn County
Nearby Lakes in Big Horn County
Frequently asked questions about Yellowtail Reservoir Rpd
Where is Yellowtail Reservoir Rpd?
- Yellowtail Reservoir Rpd is a lake in Big Horn County, Wyoming. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Yellowtail Reservoir Rpd?
- Yellowtail Reservoir Rpd in Big Horn County, Wyoming has a water quality grade of D (Nutrient-rich). Phosphorus: 95 µg/L.
Is Yellowtail Reservoir Rpd safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Yellowtail Reservoir Rpd across LakeQuality
16.6 mi away · 200 ft
14.5 mi away · recorded at 68°F
Species activity outlook by water temperature and season
Where to stay at Wyoming's top lakes, each with its grade
High nutrients, frequent algae, reduced clarity
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Other Grade D Lakes in Wyoming
Eutrophic Lakes in Wyoming
Where this data comes from
10 measurements from 1 monitoring station, 2014–2016. 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_WATERSHED10 samples · 2014–2016
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.