Beaverdam Creek Reservoir
Loudoun County, Virginia275 acresView mapDirections
Virginia DEQ publishes the water-quality measurements for Beaverdam Creek Reservoir. Here is what has been measured.
- Mesotrophic
Beaverdam Creek Reservoir in Loudoun County, Virginia has water-quality measurements published by Virginia DEQ, shown here as reported. Water clarity: 5.4 ft visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 4 µg/L. Surface area: 275 acres.
Beaverdam Creek Reservoir is a 275-acre mesotrophic lake in Loudoun County, Virginia. Overall water quality is declining over recent sampling years. Compared to the 2 other monitored lakes in Loudoun County, Beaverdam Creek Reservoir ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Virginia DEQ, last sampled 2026-06-25. Methodology: how these readings are compared.
Beaverdam Creek Reservoir covers about 280 acres in Loudoun County. For a place on the water, look through cabin and lake-house rentals near Beaverdam Creek Reservoir on Vrbo. For a hotel or motel room, Booking.com and Expedia both search around the lake.
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Beaverdam Creek Reservoir is safe to swim in today is a call for the Virginia Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Beaverdam Creek Reservoir
These are the measurements Virginia DEQ publishes for Beaverdam Creek Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 5.4 ft. Phosphorus 10 µg/L. Chlorophyll-a 4 µg/L. TSI 45.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 5.4ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 10µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 4µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 45 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Beaverdam Creek Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
275 acres
No bathymetric survey has been published for Beaverdam Creek Reservoir, so its depth is not documented here.
Stays via Stay22
Stays near Beaverdam Creek Reservoir
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Fishing Beaverdam Creek Reservoir
Water Quality Trend: Worsening
Based on 4 years of monitoring (2015–2026).
Water clarity
Worsening4 years
Phosphorus
Stable-0.22 µg/L/yr3 years
Chlorophyll-a
Worsening+0.35 µg/L/yr3 years
Reservoir Info (USACE NID)
Beaverdam Creek Reservoir is a man-made reservoir impounded by the Beaverdam Creek Dam, built primarily for water supply on the Beaverdam Creek; earth-type dam, 55 ft tall and 1,165 ft long.
- Surface area
- 275 ac
- Normal storage
- 4,082 ac-ft
- Max storage
- 6,764 ac-ft
- Drainage area
- 5.5 sq mi
- Hazard class
- High
- Owner
- Loudoun Water
Source: USACE National Inventory of Dams, NID ID VA107001 · Operator website
Nearby Lakes in Loudoun County
Frequently asked questions about Beaverdam Creek Reservoir
Where is Beaverdam Creek Reservoir?
- Beaverdam Creek Reservoir is a lake in Loudoun County, Virginia. Its water-quality measurements are published by Virginia DEQ and shown on this page as reported.
What is the water quality of Beaverdam Creek Reservoir?
- Beaverdam Creek Reservoir in Loudoun County, Virginia has water-quality measurements published by Virginia DEQ, shown here as reported. Water clarity: 5.4 ft visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 4 µg/L. Surface area: 275 acres.
Is Beaverdam Creek Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Beaverdam Creek Reservoir across LakeQuality
More lakes in Virginia
Other Lakes in Virginia
Mesotrophic Lakes in Virginia
Where this data comes from
80 measurements from 1 monitoring station, 2015–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY
21VASWCB80 samples · 2015–2026
Analytical methods
- Tyler, John. 1968. The secchi disk, Limnology and Oceanograpy, 13(1):1-6.
- Total Phosphorus After Block Digestion
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- 446.0 ~ EPA; Chlorophylls and Pheopigments in Phytoplankton by Spectrophotometry
- 2130 B ~ Nephelometric Method
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.