What is the water quality grade for Deweese Reservoir?

Deweese Reservoir in Custer County, Colorado received a water quality grade of D (Poor). Water clarity: 5.2 ft visibility.

Is Deweese Reservoir safe to swim in?

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

Custer County, Colorado

Deweese Reservoir

Grade DPoor · 5.2 ft clarity

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Limited DataEutrophic

Deweese Reservoir is a productive, nutrient-rich eutrophic lake in Custer County, Colorado. Water quality is graded D based on 1 sampling years through 2025. Compared to the 1 other monitored lakes in Custer County, Deweese Reservoir ranks #1 for water quality.

Source: EPA Water Quality Portal sampling records, Colorado DNR, last sampled 2025-10-01. 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

Murky, only visible to about 5.2 ft. Trophic State Index: 53.

Metric	Value	Grade
Water Clarity (Secchi Depth)	5.2 ft	D
Phosphorus	No data
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	53	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Deweese Reservoir

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