What is the water quality grade for Keyhole Reservoir?

Keyhole Reservoir in Crook County, Wyoming received a water quality grade of D (Poor). Water clarity: 2.5 ft visibility. Phosphorus: 40 µg/L.

Is Keyhole Reservoir safe to swim in?

Swimming not recommended, poor water quality with high algae risk. Keyhole Reservoir has an overall water quality grade of D. Always check local health department advisories before swimming.

Crook County, Wyoming · 44.37°N

Keyhole Reservoir

Grade DPoor · 2.5 ft clarity

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Eutrophic

Keyhole Reservoir is a productive, nutrient-rich eutrophic lake in Crook County, Wyoming. Water quality is graded D based on 2 sampling years through 2018. Compared to the 3 other monitored lakes in Crook County, Keyhole Reservoir ranks #3 for water quality.

Source: EPA Water Quality Portal sampling records, Wyoming DNR, last sampled 2018-09-10. Grade methodology: LakeGrade methodology.

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Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Very murky, less than 2.5 ft of visibility. Phosphorus level: 40 µg/L. Trophic State Index: 61.

Metric	Value	Grade
Water Clarity (Secchi Depth)	2.5 ft	F
Phosphorus	40 µg/L	C
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	61	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Keyhole Reservoir

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