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West Bay Lake

Vilas County, WisconsinLimited DataOligotrophic

On the LakeGrade rubric, West Bay Lake pulls an A: clarity at 27.9 ft and phosphorus readings still being added put it in the top bracket for Wisconsin. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

Trophically, West Bay Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. The lake's 57 ft maximum depth is in the upper tier for Wisconsin — deep enough for cold-water fish to find refuge in summer. West Bay Lake covers 254 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within Vilas County's 202 graded waters, West Bay Lake sits at rank 5, near the top of the local distribution.

West Bay Lake has at least one documented invasive species (Rusty Crayfish), so boaters and anglers should observe clean-drain-dry steps when leaving the lake. Walleye are documented at West Bay Lake, one of 6 fish species on record for the lake. 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 2024-08-31. Grade methodology: LakeGrade methodology.

Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Crystal clear, you can see 27.9 ft down. Trophic State Index: 29.

MetricValueGrade
Water Clarity (Secchi Depth)27.9 ftA
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)29Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Maximum Depth57 ft
Surface Area254 acres

Fish Species

Click a species to see all Wisconsin and Minnesota lakes where it is found.

→ Best fishing times for West Bay Lake (14-day solunar calendar)

→ Is it safe to eat fish from West Bay Lake? (mercury & PFAS guide)

West Bay Lake fishing regulations (limits, seasons, special rules)

Invasive Species

Rusty Crayfish

Water Quality Trend: Declining

Based on 7 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.329 m/yr6
Phosphorus Declining+0.68 µg/L/yr4
See year-by-year chart →

Location

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County Ranking

Ranked #5 of 202 lakes in Vilas County

Nearby Lakes in Vilas County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 2 stations on file (most recent sample 2025).

Fish Species (DNR-rated)

Musky(Present)Panfish(Present)Largemouth Bass(Present)Smallmouth Bass(Present)Northern Pike(Present)Walleye(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: 2024-08-31

Monitoring stations: 1