What is the water quality grade for Harriman Reservoir?

Harriman Reservoir in Windham County, Vermont received a water quality grade of A (Excellent). Water clarity: 10.2 ft visibility. Phosphorus: 6.1 µg/L. Chlorophyll-a (algae): 1 µg/L.

Is Harriman Reservoir safe to swim in?

Excellent for swimming, crystal clear water with minimal algae. Harriman Reservoir has an overall water quality grade of A. Algae concentration (chlorophyll-a) is 1 µg/L. Always check local health department advisories before swimming.

Windham County, Vermont

Harriman Reservoir

Grade AExcellent · 10.2 ft clarity

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Oligotrophic

Harriman Reservoir is a cold, clear oligotrophic lake in Windham County, Vermont. Water quality is graded A based on 3 sampling years through 2023. Compared to the 18 other monitored lakes in Windham County, Harriman Reservoir ranks #13 for water quality.

Source: EPA Water Quality Portal sampling records, Vermont DNR, last sampled 2023-05-15. Grade methodology: LakeGrade methodology.

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Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

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Water Quality Grade: A, Excellent

Good clarity, visible to about 10.2 ft. Phosphorus level: 6.1 µg/L. Chlorophyll-a: 1 µg/L. Trophic State Index: 35.

Metric	Value	Grade
Water Clarity (Secchi Depth)	10.2 ft	B
Phosphorus	6.1 µg/L	A
Chlorophyll-a (Algae)	1 µg/L	A
Trophic State Index (TSI)	35	Oligotrophic

Low nutrients, clear water, excellent for swimming

Where to stay near Harriman Reservoir

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