What is the water quality grade for Big Sandy Reservoir?

Big Sandy Reservoir in Sweetwater County, Wyoming received a water quality grade of D (Poor). Water clarity: 0.7 ft visibility. Phosphorus: 45 µg/L.

Is Big Sandy Reservoir safe to swim in?

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

Sweetwater County, Wyoming

Big Sandy Reservoir

Grade DPoor · 0.7 ft clarity

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Hypereutrophic

Big Sandy Reservoir is a highly nutrient-loaded hypereutrophic lake in Sweetwater County, Wyoming. Water quality is graded D based on 2 sampling years through 2014. Compared to the 14 other monitored lakes in Sweetwater County, Big Sandy Reservoir ranks #13 for water quality.

Source: EPA Water Quality Portal sampling records, Wyoming DNR, last sampled 2014-09-15. 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 0.7 ft of visibility. Phosphorus level: 45 µg/L. Trophic State Index: 70.

Metric	Value	Grade
Water Clarity (Secchi Depth)	0.7 ft	F
Phosphorus	45 µg/L	C
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	70	Hypereutrophic

Very high nutrients, dense algae, poor clarity

Where to stay near Big Sandy Reservoir

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