Granite Springs Reservoir
Laramie County, Wyoming190 acresView mapDirections
Wyoming DEQ publishes the water-quality measurements for Granite Springs Reservoir. Here is what has been measured.
- Oligotrophic
- 15 ft max depth
- Public access
- Limited data
Granite Springs Reservoir in Laramie County, Wyoming has water-quality measurements published by Wyoming DEQ, shown here as reported. Water clarity: 11.8 ft visibility. Phosphorus: 10 µg/L. Surface area: 190 acres.
Granite Springs Reservoir is a 190-acre cold, clear oligotrophic lake in Laramie County, Wyoming with an estimated average depth of about 15 feet. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 7 other monitored lakes in Laramie County, Granite Springs Reservoir ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2018-09-06. Methodology: how these readings are compared.
What Granite Springs Reservoir is good for
From access and monitoring records, not editorial picks.
- Clear water11.8 ft of visibility
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 Granite Springs Reservoir 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 Granite Springs Reservoir
These are the measurements Wyoming DEQ publishes for Granite Springs Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 11.8 ft. Phosphorus 10 µg/L. TSI 39.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 11.8ft | Measured, not scored 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. | 39 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Granite Springs Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~15 ft est.
Surface area
190 acres
Public access
Yes
Listed by Wyoming DEQ
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Wyoming has not published bathymetry for Granite Springs Reservoir.
Lake Size & Watershed
Watershed (drainage) area
30 sq mi
HydroLAKES / HydroSHEDS
Shoreline
3 mi
HydroLAKES / HydroSHEDS
Elevation
7,208 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 Granite Springs Reservoir
Water quality readings over time
2 seasons of samples on record (2015–2018). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Improving2 years
Phosphorus
Stable0 µg/L/yr2 years
Reservoir Info (USACE NID)
Granite Springs Reservoir is a man-made reservoir impounded by the Granite Springs (completed 1904), built primarily for water supply on the Middle Crow Creek; masonry-type dam, 90 ft tall and 423 ft long.
- Surface area
- 190 ac
- Normal storage
- 5,220 ac-ft
- Max storage
- 5,780 ac-ft
- Drainage area
- 28.4 sq mi
- Hazard class
- High
- Owner
- CITY OF CHEYENNE-CBPU
Source: USACE National Inventory of Dams, NID ID WY00001 · Operator website
Nearby Lakes in Laramie County
Frequently asked questions about Granite Springs Reservoir
Where is Granite Springs Reservoir?
- Granite Springs Reservoir is a lake in Laramie County, Wyoming. Its water-quality measurements are published by Wyoming DEQ and shown on this page as reported.
What is the water quality of Granite Springs Reservoir?
- Granite Springs Reservoir in Laramie County, Wyoming has water-quality measurements published by Wyoming DEQ, shown here as reported. Water clarity: 11.8 ft visibility. Phosphorus: 10 µg/L. Surface area: 190 acres.
Is Granite Springs Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Granite Springs Reservoir?
- No published bathymetric survey covers Granite Springs Reservoir, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 15 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 190 acres.
Can I fish at Granite Springs Reservoir?
- Public access to Granite Springs Reservoir is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Wyoming's fish and wildlife agency, so check its current regulations before you go.
Explore Granite Springs Reservoir across LakeQuality
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Where this data comes from
12 measurements from 1 monitoring station, 2015–2018. 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_WATERSHED12 samples · 2015–2018
Analytical methods
- Secchi
- 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)