Big Horn County, Wyoming · Water Quality Report Card
Yellowtail Reservoir Lpd
Yellowtail Reservoir Lpd in Big Horn County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 10 µg/L.
- Mean depth
- ~52 ft est.
- Type
- Oligotrophic
- Trend
- → Stable
Yellowtail Reservoir Lpd is a cold, clear oligotrophic lake in Big Horn County, Wyoming with an estimated average depth of about 52 feet.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2015-09-28. Grade methodology: LakeGrade methodology.
Watch Yellowtail Reservoir Lpd water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not rated for swimming — there is not enough monitoring data to judge this lake
Water Quality Grade: Not rated
No clarity data. Phosphorus level: 10 µg/L. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 10 µg/L | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~52 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Wyoming has not published bathymetry for Yellowtail Reservoir Lpd.
Where to stay near Yellowtail Reservoir Lpd
Compare lakeside cabins, hotels, and vacation rentals near Yellowtail Reservoir Lpd 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.
Top-rated places to stay near Yellowtail Reservoir Lpd
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Yellowtail Reservoir Lpd?
Get lake water-quality report cards plus the best cabin & lodging deals near Yellowtail Reservoir Lpd — straight to your inbox. No spam, unsubscribe anytime.
Planning a whole trip? See where to stay at Wyoming’s top lakes →
Fishing Yellowtail Reservoir Lpd
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 |
Location
Nearby Lakes in Big Horn County
Explore Yellowtail Reservoir Lpd across LakeGrade
16.6 mi away · 200 ft
Species activity outlook by water temperature and season
Where to stay at Wyoming's top lakes, each with its grade
Low nutrients, clear water, excellent for swimming
Wyoming's cleanest and most-polluted lakes, ranked
More Wyoming Lake Rankings
Other Lakes in Wyoming
Oligotrophic Lakes in Wyoming
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Where this data comes from
3 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_WATERSHED3 samples · 2015
Analytical methods
- Total Phosphorus After Block Digestion
Monitoring station identifiers (1)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2015-09-28
Monitoring stations: 1