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LakeQuality
B

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.

MetricValueGrade
Water Clarity (Secchi Depth)No data
Phosphorus27 µg/LB
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)52Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Maximum Depth53 ft
Surface Area972 acres
Public AccessYes

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

Banded Mystery SnailChinese Mystery SnailCurly-Leaf PondweedEurasian Water-Milfoil

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

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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.

See full comparison →

Nearby Lakes in Vilas County

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)

Northern Pike(Abundant)Musky(Common)Panfish(Common)Largemouth Bass(Common)Walleye(Common)Smallmouth Bass(Present)

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