Lake St. Catherine
Rutland County, Vermont1,024 acresView mapDirections
Vermont DEC publishes the water-quality measurements for Lake St. Catherine. Here is what has been measured.
- Mesotrophic
- Impaired · Algal growth
Lake St. Catherine in Rutland County, Vermont has water-quality measurements published by Vermont DEC, shown here as reported. Water clarity: 15.4 ft visibility. Phosphorus: 13.2 µg/L. Chlorophyll-a (algae): 2.7 µg/L. Surface area: 1024 acres.
Lake St. Catherine is a 1,024-acre mesotrophic lake in Rutland County, Vermont. Overall water quality is improving over recent sampling years. Compared to the 14 other monitored lakes in Rutland County, Lake St. Catherine ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2025-09-01. Methodology: how these readings are compared.
Lake St. Catherine covers about 1,000 acres in Rutland County. If you are planning to stay, you can search lake houses and cabins around Lake St. Catherine on Vrbo, or look for a hotel room near the lake on Booking.com or Expedia.
What Lake St. Catherine is good for
From access and monitoring records, not editorial picks.
- Clear water15.4 ft of visibility
- Big water1,024 acres
Swimming conditions
Readings onlyRecreation use not supported
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Lake St. Catherine is listed impaired under Clean Water Act §303(d) (IR 4C) for algal growth, noxious aquatic plants, nuisance exotic species. Check local advisories before you swim.
Whether Lake St. Catherine is safe to swim in today is a call for the Vermont Department of Environmental Conservation and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake St. Catherine
These are the measurements Vermont DEC publishes for Lake St. Catherine, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 15.4 ft down. Phosphorus 13.2 µg/L. Chlorophyll-a 2.7 µg/L. TSI 40.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 15.4ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 13.2µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 2.7µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 40 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Lake St. Catherine
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
1,024 acres
No bathymetric survey has been published for Lake St. Catherine, so its depth is not documented here.
Stays via Stay22
Stays near Lake St. Catherine
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Fishing Lake St. Catherine
Water Quality Trend: Improving
Based on 6 years of monitoring (2020–2025).
Water clarity
Worsening6 years
Phosphorus
Improving-0.9 µg/L/yr6 years
Chlorophyll-a
Improving-0.62 µg/L/yr6 years
Reservoir Info (USACE NID)
Lake St. Catherine is a man-made reservoir impounded by the Little Pond (completed 1900), built primarily for recreation on the Mill Brook; concrete-type dam, 7 ft tall and 89 ft long.
- Surface area
- 1,024 ac
- Normal storage
- 0 ac-ft
- Max storage
- 5,800 ac-ft
- Drainage area
- 14.05 sq mi
- Hazard class
- Low
- Owner
- STATE OF VERMONT - DFW
Source: USACE National Inventory of Dams, NID ID VT00091 · Operator website
EPA Impairment Status
Lake St. Catherine is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4C).
Causes of impairment
Designated uses not supporting: Aquatic life, Recreation, Other.
Source: EPA ATTAINS assessment unit VT02-05L03_02 · Official waterbody report
Nearby Lakes in Rutland County
Frequently asked questions about Lake St. Catherine
Where is Lake St. Catherine?
- Lake St. Catherine is a lake in Rutland County, Vermont. Its water-quality measurements are published by Vermont DEC and shown on this page as reported.
What is the water quality of Lake St. Catherine?
- Lake St. Catherine in Rutland County, Vermont has water-quality measurements published by Vermont DEC, shown here as reported. Water clarity: 15.4 ft visibility. Phosphorus: 13.2 µg/L. Chlorophyll-a (algae): 2.7 µg/L. Surface area: 1024 acres.
Is Lake St. Catherine safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake St. Catherine is listed impaired under Clean Water Act §303(d) (IR 4C) for algal growth, noxious aquatic plants, nuisance exotic species. Check local advisories before you swim.
Explore Lake St. Catherine across LakeQuality
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Where this data comes from
277 measurements from 2 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ277 samples · 2020–2025
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
- 2130 B ~ Nephelometric Method
Monitoring station identifiers (2)
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database