What is the water quality grade for Horseshoe Reservoir?

Horseshoe Reservoir in Big Horn County, Wyoming received a water quality grade of F (Very Poor). Water clarity: 1.8 ft visibility. Phosphorus: 140 µg/L.

Is Horseshoe Reservoir safe to swim in?

Avoid swimming, very poor water quality, potential algae toxins. Horseshoe Reservoir has an overall water quality grade of F. Always check local health department advisories before swimming.

Big Horn County, Wyoming

Horseshoe Reservoir

Grade FVery Poor · 1.8 ft clarity

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Hypereutrophic

Horseshoe Reservoir is a highly nutrient-loaded hypereutrophic lake in Big Horn County, Wyoming. Water quality is graded F based on 2 sampling years through 2016. Compared to the 9 other monitored lakes in Big Horn County, Horseshoe Reservoir ranks #7 for water quality.

Source: EPA Water Quality Portal sampling records, Wyoming DNR, last sampled 2016-09-20. Grade methodology: LakeGrade methodology.

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Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

Very murky, less than 1.8 ft of visibility. Phosphorus level: 140 µg/L. Trophic State Index: 72.

Metric	Value	Grade
Water Clarity (Secchi Depth)	1.8 ft	F
Phosphorus	140 µg/L	F
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	72	Hypereutrophic

Very high nutrients, dense algae, poor clarity

Where to stay near Horseshoe Reservoir

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