Twin Lakes Reservoir D
Sheridan County, Wyoming81 acresView mapDirections
Wyoming DEQ publishes the water-quality measurements for Twin Lakes Reservoir D. Here is what has been measured.
- Oligotrophic
- 13 ft max depth
- Limited data
Twin Lakes Reservoir D in Sheridan County, Wyoming has water-quality measurements published by Wyoming DEQ, shown here as reported. Phosphorus: 10 µg/L. Surface area: 81 acres.
Twin Lakes Reservoir D is a 81-acre cold, clear oligotrophic lake in Sheridan County, Wyoming with an estimated average depth of about 13 feet. Compared to the 4 other monitored lakes in Sheridan County, Twin Lakes Reservoir D ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2017-09-12. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Twin Lakes Reservoir D is safe to swim in today is a call for the Wyoming Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Twin Lakes Reservoir D
These are the measurements Wyoming DEQ publishes for Twin Lakes Reservoir D, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 10 µg/L. TSI 37.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 10µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 37 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Twin Lakes Reservoir D
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~13 ft est.
Surface area
81 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 Twin Lakes Reservoir D.
Lake Size & Watershed
Watershed (drainage) area
13 sq mi
HydroLAKES / HydroSHEDS
Shoreline
1.1 mi
HydroLAKES / HydroSHEDS
Elevation
8,573 ft
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.
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Fishing Twin Lakes Reservoir D
Reservoir Info (USACE NID)
Twin Lakes Reservoir D is a man-made reservoir impounded by the Twin Lakes No. 1 (completed 1998), built primarily for water supply on the Coney Creek; earth-type dam, 91 ft tall and 1,835 ft long.
- Surface area
- 81 ac
- Normal storage
- 3,411 ac-ft
- Max storage
- 4,041 ac-ft
- Drainage area
- 8.3 sq mi
- Hazard class
- High
- Owner
- CITY OF SHERIDAN - TOM MANOLIS
Source: USACE National Inventory of Dams, NID ID WY00647 · Operator website · Matched by proximity (0.21 km)
Nearby Lakes in Sheridan County
Frequently asked questions about Twin Lakes Reservoir D
Where is Twin Lakes Reservoir D?
- Twin Lakes Reservoir D is a lake in Sheridan County, Wyoming. Its water-quality measurements are published by Wyoming DEQ and shown on this page as reported.
What is the water quality of Twin Lakes Reservoir D?
- Twin Lakes Reservoir D in Sheridan County, Wyoming has water-quality measurements published by Wyoming DEQ, shown here as reported. Phosphorus: 10 µg/L. Surface area: 81 acres.
Is Twin Lakes Reservoir D safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Twin Lakes Reservoir D?
- No published bathymetric survey covers Twin Lakes Reservoir D, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 13 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 81 acres.
Explore Twin Lakes Reservoir D across LakeQuality
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Where this data comes from
3 measurements from 1 monitoring station, 2017. 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 · 2017
Analytical methods
- Total Phosphorus After Block Digestion
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)