Rt. Lake
Louisa County, VirginiaView mapDirections
Not enough samples to grade — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. No letter yet. Here is what we do have.
- Impaired · PCBs
- Limited data
Rt. Lake in Louisa County, Virginia is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5.2 ft visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 11.3 µg/L.
- Clarity
- 5.2 ft
- Phosphorus
- 10 µg/L
- Chlorophyll-a
- 11.3 µg/L
- Trend
- → Stable
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Stays near Rt. Lake
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Watch Rt. Lake’s letter
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Why Rt. 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 Rt. Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
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.
Rt. Lake is a lake in Louisa County, Virginia. Water clarity is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, Virginia DEQ, last sampled 2018-09-05. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Rt. Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pCBs. Check local advisories before you swim.
Water quality measurements for Rt. Lake
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 5.2 ft. Phosphorus 10 µg/L. Chlorophyll-a 11.3 µg/L. TSI 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.2 ft | Not graded |
| Phosphorus | 10 µg/L | Not graded |
| Chlorophyll-a (Algae) | 11.3 µg/L | Not graded |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Rt. Lake
Water Quality Trend: → Stable
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.072 m/yr | 4 |
| Phosphorus | → Stable | 0 µg/L/yr | 2 |
| Chlorophyll-a | ↓ Declining | +1.25 µg/L/yr | 2 |
EPA Impairment Status
Rt. Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit VAN-F07L_CON01A02 · Official waterbody report · Matched by proximity (0.63 km)
Nearby Lakes in Louisa County
Frequently asked questions about Rt. Lake
Where is Rt. Lake?
- Rt. Lake is a lake in Louisa County, Virginia. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Rt. Lake?
- Rt. Lake in Louisa County, Virginia is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5.2 ft visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 11.3 µg/L.
Is Rt. Lake safe to swim in?
- The letter is not a swimming clearance. Rt. Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pCBs. Check local advisories before you swim.
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Where this data comes from
52 measurements from 1 monitoring station, 2012–2018. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY
21VASWCB52 samples · 2012–2018
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
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