Lake Newport
Fairfax County, Virginia12 acresView mapDirections
Virginia DEQ publishes the water-quality measurements for Lake Newport. Here is what has been measured.
- Limited data
Lake Newport in Fairfax County, Virginia has water-quality measurements published by Virginia DEQ, shown here as reported. Water clarity: 4.5 ft visibility. Surface area: 12 acres.
Lake Newport is a 12-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. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lake Newport 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 Newport
These are the measurements Virginia DEQ publishes for Lake Newport, 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 4.5 ft. TSI 55.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 55 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Lake Newport
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
12 acres
No bathymetric survey has been published for Lake Newport, so its depth is not documented here.
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Stays near Lake Newport
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Fishing Lake Newport
Water Quality Trend: Stable
Based on 9 years of monitoring (2012–2022).
Water clarity
Improving9 years
Phosphorus
Worsening+0.68 µg/L/yr2 years
Chlorophyll-a
Stable+0.06 µg/L/yr2 years
Reservoir Info (USACE NID)
Lake Newport is a man-made reservoir impounded by the Lake Newport Dam, built primarily for recreation on the TR-Colvin Run; earth-type dam, 32 ft tall and 900 ft long.
- Surface area
- 12 ac
- Normal storage
- 101 ac-ft
- Max storage
- 240 ac-ft
- Drainage area
- 0.21 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 VA059030 · Operator website
Nearby Lakes in Fairfax County
Frequently asked questions about Lake Newport
Where is Lake Newport?
- Lake Newport 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 Newport?
- Lake Newport in Fairfax County, Virginia has water-quality measurements published by Virginia DEQ, shown here as reported. Water clarity: 4.5 ft visibility. Surface area: 12 acres.
Is Lake Newport safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
11 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
NALMS11 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.