Vilas County, Wisconsin · Water Quality Report Card
L St Germain Lake
L St Germain Lake in Vilas County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Maximum depth: 53 ft. Surface area: 972 acres.
- Max depth
- 53 ft
- Area
- 972 acres
- Public access
- Yes
L St Germain Lake is a 972-acre lake in Vilas County, Wisconsin with a maximum depth of 53 feet. The lake supports 6 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2020-01-14. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not rated for swimming — there is not enough monitoring data to judge this lake
Water Quality Grade: Not rated
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data |
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 53 ft |
| Surface Area | 972 acres |
| Public Access | Yes |
Where to stay near L St Germain Lake
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing L St Germain Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Location
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EPA Impairment Status
L St Germain Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WI8128746 · Official waterbody report · Matched by proximity (2.55 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Where this data comes from
2 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Wisconsin Water Science Center
USGS-WI2 samples · 2020
Monitoring station identifiers (1)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Fish and recreation data from Wisconsin DNR Lakes
Most recent sample: 2020-01-14
Monitoring stations: 1