Beaverdam Creek Reservior Lake 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 Reservior Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Virginia DNR, last sampled 2026-05-20. 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 4.9 ft. Phosphorus level: 10 µg/L. Chlorophyll-a: 4.8 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.9 ft | D |
| Phosphorus | 10 µg/L | A |
| Chlorophyll-a (Algae) | 4.8 µg/L | B |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Beaverdam Creek Reservior Lake
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Fishing Beaverdam Creek Reservior Lake
Location
County Ranking
Ranked #1 of 3 lakes in Loudoun County
Nearby Lakes in Loudoun County
Explore Beaverdam Creek Reservior Lake across LakeGrade
More Virginia Lake Rankings
Other Grade A Lakes in Virginia
Mesotrophic Lakes in Virginia
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2026-05-20
Monitoring stations: 1