What is the water quality grade for Willow Creek Reservoir?

Willow Creek Reservoir in Grand County, Colorado received a water quality grade of C (Fair). Water clarity: 3.9 ft visibility. Phosphorus: 87.5 µg/L. Chlorophyll-a (algae): 2.4 µg/L.

Is Willow Creek Reservoir safe to swim in?

Generally safe for swimming, moderate water quality. Willow Creek Reservoir has an overall water quality grade of C. Algae concentration (chlorophyll-a) is 2.4 µg/L. Always check local health department advisories before swimming.

Grand County, Colorado

Willow Creek Reservoir

Grade CFair · 3.9 ft clarity

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Eutrophic

Willow Creek Reservoir is a productive, nutrient-rich eutrophic lake in Grand County, Colorado. Water quality is graded C based on 3 sampling years through 2024. Compared to the 5 other monitored lakes in Grand County, Willow Creek Reservoir ranks #6 for water quality.

Source: EPA Water Quality Portal sampling records, Colorado DNR, last sampled 2024-01-29. Grade methodology: LakeGrade methodology.

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 3.9 ft. Phosphorus level: 87.5 µg/L. Chlorophyll-a: 2.4 µg/L. Trophic State Index: 55.

Metric	Value	Grade
Water Clarity (Secchi Depth)	3.9 ft	D
Phosphorus	87.5 µg/L	D
Chlorophyll-a (Algae)	2.4 µg/L	A
Trophic State Index (TSI)	55	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Willow Creek Reservoir

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