What is the water quality grade for Onion Valley Reservoir @ Dam?

Onion Valley Reservoir @ Dam in Humboldt County, Nevada received a water quality grade of B (Good). Phosphorus: 50 µg/L. Chlorophyll-a (algae): 0.6 µg/L.

Is Onion Valley Reservoir @ Dam safe to swim in?

Good for swimming, clear water with low algae levels. Onion Valley Reservoir @ Dam has an overall water quality grade of B. Algae concentration (chlorophyll-a) is 0.6 µg/L. Always check local health department advisories before swimming.

Humboldt County, Nevada

Onion Valley Reservoir @ Dam

Grade BGood water quality

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Mesotrophic

Onion Valley Reservoir @ Dam is a mesotrophic lake in Humboldt County, Nevada. Water quality is graded B based on 2 sampling years through 2021. Compared to the 8 other monitored lakes in Humboldt County, Onion Valley Reservoir @ Dam ranks #1 for water quality.

Source: EPA Water Quality Portal sampling records, Nevada DNR, last sampled 2021-10-05. Grade methodology: LakeGrade methodology.

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

No clarity data. Phosphorus level: 50 µg/L. Chlorophyll-a: 0.6 µg/L. Trophic State Index: 43.

Metric	Value	Grade
Water Clarity (Secchi Depth)	No data
Phosphorus	50 µg/L	C
Chlorophyll-a (Algae)	0.6 µg/L	A
Trophic State Index (TSI)	43	Mesotrophic

Moderate nutrients, good water quality

Where to stay near Onion Valley Reservoir @ Dam

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