Beaverdam Creek Reservoir
Loudoun County, Virginia275 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- Impaired · Pathogens (E. coli, fecal)
- #3 of 3 in the county
Beaverdam Creek Reservoir in Loudoun County, Virginia has a water quality grade of A (Excellent). Water clarity: 5.4 ft visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 4 µg/L. Surface area: 275 acres.
- Clarity
- 5.4 ft
- Area
- 275 acres
- Type
- Mesotrophic
- Phosphorus
- 10 µg/L
- Chlorophyll-a
- 4 µg/L
- Trend
- ↓ Declining
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Watch Beaverdam Creek Reservoir’s letter
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Beaverdam Creek Reservoir is a 275-acre mesotrophic lake in Loudoun County, Virginia. Water quality is graded A based on 2 sampling years through 2026. 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. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyBacteria advisory
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The A is nutrients and algae, not a swimming clearance. Beaverdam Creek Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for pathogens (E. coli, fecal). Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Murky, only visible to about 5.4 ft. Phosphorus 10 µg/L. Chlorophyll-a 4 µg/L. TSI 45. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.4 ft | Not graded |
| Phosphorus | 10 µg/L | Good |
| Chlorophyll-a (Algae) | 4 µg/L | Good |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 275 acres |
No bathymetric survey has been published for Beaverdam Creek Reservoir, so its depth is not documented here.
Fishing Beaverdam Creek Reservoir
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.06 m/yr | 4 |
| Phosphorus | → Stable | -0.22 µg/L/yr | 3 |
| Chlorophyll-a | ↓ Declining | +0.35 µg/L/yr | 3 |
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
EPA Impairment Status
Beaverdam Creek Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit VAN-A08L_GOO02B06 · Official waterbody report · Matched by proximity (0.98 km)
County Ranking
Ranked #3 of 3 lakes in Loudoun County
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. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Beaverdam Creek Reservoir?
- Beaverdam Creek Reservoir in Loudoun County, Virginia has a water quality grade of A (Excellent). 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?
- The A is nutrients and algae, not a swimming clearance. Beaverdam Creek Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for pathogens (E. coli, fecal). Check local advisories before you swim.
Explore Beaverdam Creek Reservoir across LakeQuality
More Virginia Lake Rankings
Other Grade A 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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database