Deaver Reservoir -D
Park County, Wyoming80 acresView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
- Mesotrophic
- #4 of 5 in the county
- 25 ft max depth
- Limited data
Deaver Reservoir -D in Park County, Wyoming has a water quality grade of B (Good). Phosphorus: 20 µg/L. Surface area: 80 acres.
- Max depth
- ~25 ft est.
- Area
- 80 acres
- Type
- Mesotrophic
- Phosphorus
- 20 µg/L
- Trend
- → Stable
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Watch Deaver Reservoir -D’s letter
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Deaver Reservoir -D is a 80-acre mesotrophic lake in Park County, Wyoming with an estimated average depth of about 25 feet. Water quality is graded B based on 1 sampling years through 2016. Compared to the 4 other monitored lakes in Park County, Deaver Reservoir -D ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2016-09-20. 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 B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: B (Good)
No clarity data. Phosphorus 20 µg/L. TSI 47. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 20 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~25 ft est. |
| Average Depth | ~8 ft est. |
| Surface Area | 80 acres |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Wyoming has not published bathymetry for Deaver Reservoir -D.
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.
Fishing Deaver Reservoir -D
Water Quality Trend: → Stable
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | → Stable | 0 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Deaver Reservoir -D is a man-made reservoir impounded by the Deaver Dam (completed 1918), built primarily for fish and wildlife pond on the Shoshone River Offstream; earth-type dam, 16 ft tall and 1,300 ft long.
- Surface area
- 80 ac
- Normal storage
- 681 ac-ft
- Max storage
- 681 ac-ft
- Drainage area
- 1 sq mi
- Hazard class
- Low
- Owner
- BUREAU OF RECLAMATION
All listed purposes: Fish and Wildlife Pond;Irrigation.
Source: USACE National Inventory of Dams, NID ID WY01379 · Operator website · Matched by proximity (0.21 km)
County Ranking
Ranked #4 of 5 lakes in Park County
Nearby Lakes in Park County
Frequently asked questions about Deaver Reservoir -D
Where is Deaver Reservoir -D?
- Deaver Reservoir -D is a lake in Park County, Wyoming. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Deaver Reservoir -D?
- Deaver Reservoir -D in Park County, Wyoming has a water quality grade of B (Good). Phosphorus: 20 µg/L. Surface area: 80 acres.
Is Deaver Reservoir -D safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Deaver Reservoir -D?
- No published bathymetric survey covers Deaver Reservoir -D, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 25 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 80 acres.
Explore Deaver Reservoir -D across LakeQuality
More Wyoming Lake Rankings
Other Grade B Lakes in Wyoming
Mesotrophic Lakes in Wyoming
Where this data comes from
8 measurements from 1 monitoring station, 2015–2016. 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_WATERSHED8 samples · 2015–2016
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.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)