Lake Frederick-Right Arm
Frederick County, Virginia91 acresView mapDirections
Nutrients and algae sit mid-range for this region.
- Mesotrophic
- #2 of 2 in the county
Lake Frederick-Right Arm in Frederick County, Virginia has a water quality grade of C (Fair). Water clarity: 9.2 ft visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 4.7 µg/L. Surface area: 91 acres.
- Clarity
- 9.2 ft
- Area
- 91 acres
- Type
- Mesotrophic
- Phosphorus
- 20 µg/L
- Chlorophyll-a
- 4.7 µg/L
- Trend
- ↓ Declining
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Watch Lake Frederick-Right Arm’s letter
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Lake Frederick-Right Arm is a 91-acre mesotrophic lake in Frederick County, Virginia. Water quality is graded C based on 2 sampling years through 2026. Overall water quality is declining over recent sampling years. Compared to the 1 other monitored lakes in Frederick County, Lake Frederick-Right Arm ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Virginia DEQ, last sampled 2026-07-07. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyModerate
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 C is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: C (Fair)
Moderate clarity, visible to about 9.2 ft. Phosphorus 20 µg/L. Chlorophyll-a 4.7 µg/L. TSI 46. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.2 ft | Not graded |
| Phosphorus | 20 µg/L | Fair |
| Chlorophyll-a (Algae) | 4.7 µg/L | Good |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 91 acres |
No bathymetric survey has been published for Lake Frederick-Right Arm, so its depth is not documented here.
Fishing Lake Frederick-Right Arm
Water Quality Trend: ↓ Declining
Based on 10 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.152 m/yr | 10 |
| Phosphorus | ↓ Declining | +0.58 µg/L/yr | 10 |
| Chlorophyll-a | ↓ Declining | +0.14 µg/L/yr | 10 |
Reservoir Info (USACE NID)
Lake Frederick-Right Arm is a man-made reservoir impounded by the Lake Frederick Dam, built primarily for recreation on the Crooked Run; earth-type dam, 74 ft tall and 680 ft long.
- Surface area
- 91 ac
- Normal storage
- 2,410 ac-ft
- Max storage
- 4,300 ac-ft
- Drainage area
- 3 sq mi
- Hazard class
- High
- Owner
- Virginia Department of Wildlife Resources
Source: USACE National Inventory of Dams, NID ID VA069013 · Operator website · Matched by proximity (0.99 km)
County Ranking
Ranked #2 of 2 lakes in Frederick County
Nearby Lakes in Frederick County
Frequently asked questions about Lake Frederick-Right Arm
Where is Lake Frederick-Right Arm?
- Lake Frederick-Right Arm is a lake in Frederick County, Virginia. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Frederick-Right Arm?
- Lake Frederick-Right Arm in Frederick County, Virginia has a water quality grade of C (Fair). Water clarity: 9.2 ft visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 4.7 µg/L. Surface area: 91 acres.
Is Lake Frederick-Right Arm safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Lake Frederick-Right Arm across LakeQuality
More Virginia Lake Rankings
Other Grade C Lakes in Virginia
Mesotrophic Lakes in Virginia
Where this data comes from
259 measurements from 1 monitoring station, 2013–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY
21VASWCB259 samples · 2013–2026
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.