Lake Anne
Fairfax County, Virginia25 acresView mapDirections
Virginia DEQ publishes the water-quality measurements for Lake Anne. Here is what has been measured.
- Limited data
Ask about Lake Anne
Answers come straight from the public measurements and survey records on this page.
Lake Anne in Fairfax County, Virginia has water-quality measurements published by Virginia DEQ, shown here as reported. Water clarity: 4.4 ft visibility. Surface area: 24.8 acres.
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Lake Anne is a 25-acre lake in Fairfax County, Virginia. Water clarity is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, Virginia DEQ, last sampled 2022-07-11. Grade methodology: LakeQuality methodology.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lake Anne 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 Lake Anne
These are the measurements Virginia DEQ publishes for Lake Anne, 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 4.4 ft. TSI 56.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.4 ft | Measured, not scored |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 56 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 25 acres |
No bathymetric survey has been published for Lake Anne, so its depth is not documented here.
Fishing Lake Anne
Water Quality Trend: → Stable
Based on 9 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.115 m/yr | 9 |
| Phosphorus | ↓ Declining | +0.68 µg/L/yr | 2 |
| Chlorophyll-a | → Stable | +0.06 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Lake Anne is a man-made reservoir impounded by the Lake Anne Dam, built primarily for recreation on the TR-Colvin Run; earth-type dam, 47 ft tall and 590 ft long.
- Surface area
- 24.8 ac
- Normal storage
- 363 ac-ft
- Max storage
- 745 ac-ft
- Drainage area
- 0.91 sq mi
- Hazard class
- High
- Owner
- Reston Association;Reston Association
All listed purposes: Recreation;Flood Risk Reduction.
Source: USACE National Inventory of Dams, NID ID VA059009 · Operator website
Nearby Lakes in Fairfax County
Frequently asked questions about Lake Anne
Where is Lake Anne?
- Lake Anne is a lake in Fairfax County, Virginia. Its water-quality measurements are published by Virginia DEQ and shown on this page as reported.
What is the water quality of Lake Anne?
- Lake Anne in Fairfax County, Virginia has water-quality measurements published by Virginia DEQ, shown here as reported. Water clarity: 4.4 ft visibility. Surface area: 24.8 acres.
Is Lake Anne safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Lake Anne across LakeQuality
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Where this data comes from
5 measurements from 1 monitoring station, 2013–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS5 samples · 2013–2022
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.