What is the water quality grade for Beaverdam Creek Reservoir?

Beaverdam Creek Reservoir in Loudoun County, Virginia received a water quality grade of A (Excellent). Water clarity: 5.4 ft visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 3.9 µg/L.

Is Beaverdam Creek Reservoir safe to swim in?

Excellent for swimming, crystal clear water with minimal algae. Beaverdam Creek Reservoir has an overall water quality grade of A. Algae concentration (chlorophyll-a) is 3.9 µg/L. Always check local health department advisories before swimming.

Loudoun County, Virginia

Beaverdam Creek Reservoir

Grade AExcellent · 5.4 ft clarity

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Mesotrophic

Beaverdam Creek Reservoir is a mesotrophic lake in Loudoun County, Virginia. Water quality is graded A based on 2 sampling years through 2026. Compared to the 2 other monitored lakes in Loudoun County, Beaverdam Creek Reservoir ranks #2 for water quality.

Source: EPA Water Quality Portal sampling records, Virginia DNR, last sampled 2026-06-25. Grade methodology: LakeGrade methodology.

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Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Murky, only visible to about 5.4 ft. Phosphorus level: 10 µg/L. Chlorophyll-a: 3.9 µg/L. Trophic State Index: 45.

Metric	Value	Grade
Water Clarity (Secchi Depth)	5.4 ft	C
Phosphorus	10 µg/L	A
Chlorophyll-a (Algae)	3.9 µg/L	B
Trophic State Index (TSI)	45	Mesotrophic

Moderate nutrients, good water quality

Where to stay near Beaverdam Creek Reservoir

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