What is the water quality grade for North Arm of Mill Creek Lake?

North Arm of Mill Creek Lake in Amherst County, Virginia received a water quality grade of B (Good). Water clarity: 3.6 ft visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 14.1 µg/L.

Is North Arm of Mill Creek Lake safe to swim in?

Good for swimming, clear water with low algae levels. North Arm of Mill Creek Lake has an overall water quality grade of B. Algae concentration (chlorophyll-a) is 14.1 µg/L. Always check local health department advisories before swimming.

Amherst County, Virginia

North Arm of Mill Creek Lake

Grade BGood · 3.6 ft clarity

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Eutrophic

North Arm of Mill Creek Lake is a productive, nutrient-rich eutrophic lake in Amherst County, Virginia. Water quality is graded B based on 2 sampling years through 2026. Compared to the 6 other monitored lakes in Amherst County, North Arm of Mill Creek Lake ranks #5 for water quality.

Source: EPA Water Quality Portal sampling records, Virginia DNR, last sampled 2026-07-08. Grade methodology: LakeGrade methodology.

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Murky, only visible to about 3.6 ft. Phosphorus level: 20 µg/L. Chlorophyll-a: 14.1 µg/L. Trophic State Index: 54.

Metric	Value	Grade
Water Clarity (Secchi Depth)	3.6 ft	D
Phosphorus	20 µg/L	B
Chlorophyll-a (Algae)	14.1 µg/L	C
Trophic State Index (TSI)	54	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near North Arm of Mill Creek Lake

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