What is the water quality grade for Boysen Reservoir?

Boysen Reservoir in Fremont County, Wyoming received a water quality grade of C (Fair). Water clarity: 8.1 ft visibility. Phosphorus: 40 µg/L.

Is Boysen Reservoir safe to swim in?

Generally safe for swimming, moderate water quality. Boysen Reservoir has an overall water quality grade of C. Always check local health department advisories before swimming.

Fremont County, Wyoming · 43.30°N

Boysen Reservoir

Grade CFair · 8.1 ft clarity

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Eutrophic

Boysen Reservoir is a productive, nutrient-rich eutrophic lake in Fremont County, Wyoming. Water quality is graded C based on 2 sampling years through 2023. Compared to the 36 other monitored lakes in Fremont County, Boysen Reservoir ranks #8 for water quality.

Source: EPA Water Quality Portal sampling records, Wyoming DNR, last sampled 2023-10-10. Grade methodology: LakeGrade methodology.

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Moderate clarity, visible to about 8.1 ft. Phosphorus level: 40 µg/L. Trophic State Index: 52.

Metric	Value	Grade
Water Clarity (Secchi Depth)	8.1 ft	C
Phosphorus	40 µg/L	C
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	52	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Boysen Reservoir

Compare lakeside cabins, hotels, and vacation rentals near Boysen Reservoir in Fremont County, Wyoming — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

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