Upper Sunshine Reservoir Lpd
Park County, Wyoming1,156 acresView 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 Sunshine Reservoir Lpd in Park County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 15 µg/L. Surface area: 1156 acres.
- Area
- 1,156 acres
- Phosphorus
- 15 µg/L
- Trend
- ↑ Improving
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Watch Upper Sunshine Reservoir Lpd’s letter
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Why Upper Sunshine Reservoir Lpd 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 Sunshine Reservoir Lpd, 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 Sunshine Reservoir Lpd is a 1,156-acre lake in Park County, Wyoming. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2015-09-28. Grade methodology: LakeQuality methodology.
What Upper Sunshine Reservoir Lpd is good for
From access and monitoring records, not editorial picks.
- Big water1,156 acres
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Upper Sunshine Reservoir Lpd
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 15 µg/L. TSI 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 15 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 1,156 acres |
No bathymetric survey has been published for Upper Sunshine Reservoir Lpd, so its depth is not documented here.
Fishing Upper Sunshine Reservoir Lpd
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -10 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Upper Sunshine Reservoir Lpd is a man-made reservoir impounded by the Upper Sunshine (completed 1942), built primarily for irrigation on the Greybull River (Offstream); earth-type dam, 160 ft tall and 1,150 ft long.
- Surface area
- 1,156 ac
- Normal storage
- 52,987 ac-ft
- Max storage
- 65,100 ac-ft
- Drainage area
- 12.8 sq mi
- Hazard class
- High
- Owner
- GREYBULL VALLEY IRRIGATION DISTRICT
Source: USACE National Inventory of Dams, NID ID WY01097 · Operator website · Matched by proximity (0.2 km)
Graded lakes near Upper Sunshine Reservoir Lpd
Upper Sunshine Reservoir Lpd has no grade, but these lakes within a short drive do.
Nearby Lakes in Park County
Frequently asked questions about Upper Sunshine Reservoir Lpd
Where is Upper Sunshine Reservoir Lpd?
- Upper Sunshine Reservoir Lpd is a lake in Park 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 Sunshine Reservoir Lpd?
- Upper Sunshine Reservoir Lpd in Park County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 15 µg/L. Surface area: 1156 acres.
Is Upper Sunshine Reservoir Lpd safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Upper Sunshine Reservoir Lpd across LakeQuality
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Where this data comes from
6 measurements from 1 monitoring station, 2014–2015. 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_WATERSHED6 samples · 2014–2015
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.