What is the water quality grade for Keyhole Reservoir?

Keyhole Reservoir in Crook County, Wyoming received a water quality grade of B (Good). Water clarity: 10.6 ft visibility. Phosphorus: 20 µg/L.

Is Keyhole Reservoir safe to swim in?

Good for swimming, clear water with low algae levels. Keyhole Reservoir has an overall water quality grade of B. Always check local health department advisories before swimming.

Crook County, Wyoming · 44.37°N

Keyhole Reservoir

Grade BGood · 10.6 ft clarity

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Mesotrophic

Keyhole Reservoir is a mesotrophic lake in Crook County, Wyoming. Water quality is graded B based on 2 sampling years through 2018. Compared to the 3 other monitored lakes in Crook County, Keyhole Reservoir ranks #1 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

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Good clarity, visible to about 10.6 ft. Phosphorus level: 20 µg/L. Trophic State Index: 45.

Metric	Value	Grade
Water Clarity (Secchi Depth)	10.6 ft	B
Phosphorus	20 µg/L	B
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	45	Mesotrophic

Moderate nutrients, good water quality

Where to stay near Keyhole Reservoir

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