Lake St. Catherine
Rutland County, Vermont1,024 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- Impaired · Algal growth
- #1 of 15 in the county
Lake St. Catherine in Rutland County, Vermont has a water quality grade of A (Excellent). Water clarity: 15.4 ft visibility. Phosphorus: 13.2 µg/L. Chlorophyll-a (algae): 2.7 µg/L. Surface area: 1024 acres.
- Clarity
- 15.4 ft
- Area
- 1,024 acres
- Type
- Mesotrophic
- Phosphorus
- 13.2 µg/L
- Chlorophyll-a
- 2.7 µg/L
- Trend
- ↑ Improving
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Watch Lake St. Catherine’s letter
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Lake St. Catherine is a 1,024-acre mesotrophic lake in Rutland County, Vermont. Water quality is graded A based on 2 sampling years through 2025. 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. Grade methodology: LakeQuality methodology.
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 Safety
Grade onlyLow algae
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 A is nutrients and algae, 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.
Water Quality Grade: A (Excellent)
Crystal clear, you can see 15.4 ft down. Phosphorus 13.2 µg/L. Chlorophyll-a 2.7 µg/L. TSI 40. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 15.4 ft | Not graded |
| Phosphorus | 13.2 µg/L | Good |
| Chlorophyll-a (Algae) | 2.7 µg/L | Good |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 1,024 acres |
No bathymetric survey has been published for Lake St. Catherine, so its depth is not documented here.
Fishing Lake St. Catherine
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.114 m/yr | 6 |
| Phosphorus | ↑ Improving | -0.9 µg/L/yr | 6 |
| Chlorophyll-a | ↑ Improving | -0.62 µg/L/yr | 6 |
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
Source: EPA ATTAINS assessment unit VT02-05L03_02 · Official waterbody report
County Ranking
Ranked #1 of 15 lakes in Rutland County
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. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake St. Catherine?
- Lake St. Catherine in Rutland County, Vermont has a water quality grade of A (Excellent). 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?
- The A is nutrients and algae, 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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Other Grade A Lakes in Vermont
Mesotrophic Lakes in Vermont
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)
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