Lower North Crow Reservoir
Laramie County, WyomingView mapDirections
Wyoming DEQ publishes the water-quality measurements for Lower North Crow Reservoir. Here is what has been measured.
- Mesotrophic
- Limited data
Lower North Crow Reservoir in Laramie County, Wyoming has water-quality measurements published by Wyoming DEQ, shown here as reported. Water clarity: 9.4 ft visibility. Phosphorus: 20 µg/L.
Lower North Crow Reservoir is a 0-acre mesotrophic lake in Laramie County, Wyoming. Compared to the 7 other monitored lakes in Laramie County, Lower North Crow Reservoir ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2020-09-15. 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 Lower North Crow 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 Lower North Crow Reservoir
These are the measurements Wyoming DEQ publishes for Lower North Crow Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 9.4 ft. Phosphorus 20 µg/L. TSI 46.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 9.4ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 20µg/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. | 46 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
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Fishing Lower North Crow Reservoir
Reservoir Info (USACE NID)
Lower North Crow Reservoir is a man-made reservoir impounded by the North Crow Diversion (completed 1910), built primarily for water supply on the North Fork of Crow Creek; arch-type dam, 46 ft tall and 146 ft long.
- Surface area
- 0 ac
- Normal storage
- 75 ac-ft
- Max storage
- 4,000 ac-ft
- Drainage area
- 28.2 sq mi
- Hazard class
- Significant
- Owner
- CITY OF CHEYENNE-CBPU
Source: USACE National Inventory of Dams, NID ID WY01315 · Operator website · Matched by proximity (0.06 km)
Nearby Lakes in Laramie County
Frequently asked questions about Lower North Crow Reservoir
Where is Lower North Crow Reservoir?
- Lower North Crow 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 Lower North Crow Reservoir?
- Lower North Crow Reservoir in Laramie County, Wyoming has water-quality measurements published by Wyoming DEQ, shown here as reported. Water clarity: 9.4 ft visibility. Phosphorus: 20 µg/L.
Is Lower North Crow Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Lower North Crow Reservoir across LakeQuality
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Where this data comes from
6 measurements from 1 monitoring station, 2020. 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 · 2020
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.