North Anna River Lake
Spotsylvania County, VirginiaView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Impaired · Algal growth
- Limited data
North Anna River Lake in Spotsylvania County, Virginia is not rated for water quality — its monitoring record does not meet the evidence bar. Chlorophyll-a (algae): 59.5 µg/L.
- Chlorophyll-a
- 59.5 µg/L
- Trend
- ↓ Declining
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Stays near North Anna River Lake
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Watch North Anna River Lake’s letter
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Why North Anna River Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For North Anna River Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded algae (chlorophyll-a), but not water clarity and phosphorus.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by Virginia DEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
North Anna River Lake is a lake in Spotsylvania County, Virginia. Overall water quality is declining over recent sampling years. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Virginia DEQ, last sampled 2020-09-09. Grade methodology: LakeQuality methodology.
What North Anna River Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. North Anna River Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, pCBs. Check local advisories before you swim.
Water quality measurements for North Anna River Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Chlorophyll-a 59.5 µg/L. TSI 71.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 59.5 µg/L | Not graded |
| Trophic State Index (TSI) | 71 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Recreation & Access
- The Boardwalk on Lake AnnaSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing North Anna River Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.031 m/yr | 4 |
EPA Impairment Status
North Anna River Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit VAN-F07L_NAR04A06 · Official waterbody report · Matched by proximity (1.44 km)
Nearby Lakes in Spotsylvania County
Frequently asked questions about North Anna River Lake
Where is North Anna River Lake?
- North Anna River Lake is a lake in Spotsylvania County, Virginia. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for North Anna River Lake?
- North Anna River Lake in Spotsylvania County, Virginia is not rated for water quality — its monitoring record does not meet the evidence bar. Chlorophyll-a (algae): 59.5 µg/L.
Is North Anna River Lake safe to swim in?
- The letter is not a swimming clearance. North Anna River Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, pCBs. Check local advisories before you swim.
Are there boat ramps on North Anna River Lake?
- North Anna River Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include The Boardwalk on Lake Anna.
Explore North Anna River Lake across LakeQuality
Planning a trip around Shenandoah?
North Anna River Lake is about 40 miles from Shenandoah National Park. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Shenandoah →More Virginia Lake Rankings
Other Lakes in Virginia
Hypereutrophic Lakes in Virginia
Where this data comes from
3 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Virginia Water Science Center
USGS-VA3 samples · 2020
Analytical methods
- Plant pigments, sonication & 445
- YSI EXO turbidity sensor, FNU
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
Named boat-access points from the USGS National Boat Ramps inventory