Port Henry Section Lake
Addison County, VermontView mapDirections
Nutrients and algae sit mid-range for this region.
↓ down from B at the last regrade
- Mesotrophic
- Impaired · Mercury
- #4 of 5 in the county
- Public access
Port Henry Section Lake in Addison County, Vermont has a water quality grade of C (Fair). Water clarity: 10.8 ft visibility. Phosphorus: 13.3 µg/L. Chlorophyll-a (algae): 5.9 µg/L.
- Clarity
- 10.8 ft
- Type
- Mesotrophic
- Phosphorus
- 13.3 µg/L
- Chlorophyll-a
- 5.9 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Port Henry Section Lake’s letter
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Port Henry Section Lake is a mesotrophic lake in Addison County, Vermont. Water quality is graded C based on 2 sampling years through 2024. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 5 public boat landings. Compared to the 4 other monitored lakes in Addison County, Port Henry Section Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2024-10-11. Grade methodology: LakeQuality methodology.
What Port Henry Section Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10.8 ft of visibility
- Boat launch5 documented ramps
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. Port Henry Section Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, nutrients (phosphorus, nitrogen), pCBs. Check local advisories before you swim.
Water Quality Grade: C (Fair)
Good clarity, visible to about 10.8 ft. Phosphorus 13.3 µg/L. Chlorophyll-a 5.9 µg/L. TSI 44. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.8 ft | Not graded |
| Phosphorus | 13.3 µg/L | Good |
| Chlorophyll-a (Algae) | 5.9 µg/L | Fair |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Recreation & Access
- Dead CreekPublic
- Port HenryPublic
- Port HenryPublic
- Champlain Bridge MarinaSemi-private
- Port Henry MarinaSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Port Henry Section Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.34 m/yr | 4 |
| Phosphorus | ↓ Declining | +0.7 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -0.71 µg/L/yr | 4 |
EPA Impairment Status
Port Henry Section 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 VT04-01L02_01 · Official waterbody report · Matched by proximity (1.82 km)
County Ranking
Ranked #4 of 5 lakes in Addison County
Nearby Lakes in Addison County
Frequently asked questions about Port Henry Section Lake
Where is Port Henry Section Lake?
- Port Henry Section Lake is a lake in Addison County, Vermont. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Port Henry Section Lake?
- Port Henry Section Lake in Addison County, Vermont has a water quality grade of C (Fair). Water clarity: 10.8 ft visibility. Phosphorus: 13.3 µg/L. Chlorophyll-a (algae): 5.9 µg/L.
Is Port Henry Section Lake safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Port Henry Section Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, nutrients (phosphorus, nitrogen), pCBs. Check local advisories before you swim.
Are there boat ramps on Port Henry Section Lake?
- Port Henry Section Lake has 5 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Dead Creek, Port Henry, Port Henry, Champlain Bridge Marina, among others. Public access is listed as yes.
Explore Port Henry Section Lake across LakeQuality
12.2 mi away · 47 ft
Species activity outlook by water temperature and season
Where to stay at Vermont's top lakes, each with its grade
Moderate nutrients, good water quality
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Other Grade C Lakes in Vermont
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Where this data comes from
262 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ262 samples · 2020–2024
Analytical methods
- EPA approved Alternate Test Procedure for 4500 P H. Has a 28 day hold without acid preservation.
- 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
Named boat-access points from the USGS National Boat Ramps inventory