L St Germain Lk Site K @ S. Bay Lake
Vilas County, WisconsinLimited DataEutrophic
L St Germain Lk Site K @ S. Bay Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.
A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. L St Germain Lk Site K @ S. Bay Lake is unusually deep for Wisconsin at 53 ft, which buffers the lake against summer warming and helps the deep water stay oxygenated. At 972 acres, L St Germain Lk Site K @ S. Bay Lake fits the Wisconsin median for monitored lakes, with partial shoreline records. L St Germain Lk Site K @ S. Bay Lake ranks 184 of 202 in Vilas County — at the lower end of the locally monitored distribution.
Eurasian watermilfoil is established at L St Germain Lk Site K @ S. Bay Lake, which can dampen recreational access and pressure the native plant community. Walleye are documented at L St Germain Lk Site K @ S. Bay Lake, one of 6 fish species on record for the lake. Public access is available — the lake is on the Wisconsin DNR public-access list. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2020-01-14. Grade methodology: LakeGrade methodology.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
No clarity data. Phosphorus level: 27 µg/L. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 27 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 53 ft |
| Surface Area | 972 acres |
| Public Access | Yes |
Fish Species
Click a species to see all Wisconsin and Minnesota lakes where it is found.
→ Best fishing times for L St Germain Lk Site K @ S. Bay Lake (14-day solunar calendar)
→ Is it safe to eat fish from L St Germain Lk Site K @ S. Bay Lake? (mercury & PFAS guide)
→ L St Germain Lk Site K @ S. Bay Lake fishing regulations (limits, seasons, special rules)
Invasive Species
Recreation & Access
Location
County Ranking
Ranked #184 of 202 lakes in Vilas County
Cleaner Lakes Within 30 Miles
L St Germain Lk Site K @ S. Bay Lake holds Grade B. 5 nearby lakes hold higher grades.
- AAlma LakeVilas County · 1.3 mi · Higher grade (B → A)
- AMoon LakeVilas County · 1.3 mi · Higher grade (B → A)
- AMcdonald LakeVilas County · 2.8 mi · Higher grade (B → A)
- ALake ContentVilas County · 3.1 mi · Higher grade (B → A)
- AFound LakeVilas County · 3.3 mi · Higher grade (B → A)
Nearby Lakes in Vilas County
More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1990. 16 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Fish and recreation data from Wisconsin DNR Lakes
Most recent sample: 2020-01-14
Monitoring stations: 1