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LakeQuality
C

Bass Lake

Oneida County, WisconsinMesotrophic

The LakeGrade rubric puts Bass Lake at a C: clarity at 6.0 ft, 21 µg/L of phosphorus, and a TSI of 50 signal an intermediate trophic state. Secchi readings are the weakest of the three parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

A TSI near 50 places Bass Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. Bass Lake reaches 20 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. The lake's 184 acres and partial shoreline records put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Among the 134 graded lakes in Oneida County, Bass Lake sits at rank 64, above the county median.

Eurasian watermilfoil is established at Bass Lake, which can dampen recreational access and pressure the native plant community. Walleye are documented at Bass 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 2025-09-08. Grade methodology: LakeGrade methodology.

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 6 ft. Phosphorus level: 21 µg/L. Trophic State Index: 50.

MetricValueGrade
Water Clarity (Secchi Depth)6 ftD
Phosphorus21 µg/LB
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)50Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth20 ft
Surface Area184 acres
Public AccessYes

Fish Species

Click a species to see every graded lake where it is documented.

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

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

Bass Lake fishing regulations (limits, seasons, special rules)

Invasive & Introduced Species

Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.

Chinese Mystery SnailEurasian Water-MilfoilRusty Crayfish

Water Quality Trend: Improving

Based on 6 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Stable+0.079 m/yr6
Phosphorus Improving-2 µg/L/yr3
See year-by-year chart →

Recreation & Access

4
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #64 of 134 lakes in Oneida County

Cleaner Lakes Within 30 Miles

Bass Lake holds Grade C. One nearby lake has a higher grade.

See full comparison →

Nearby Lakes in Oneida County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2014. 1 station on file (most recent sample 2025).

DNR Assessment
Excellent · Shallow Headwater lake
Trophic State Index 51 (eutrophic) · 5-year average

Fish Species (DNR-rated)

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

DNR Reports & Resources

Wisconsin DNR Fisheries scientists publish multi-year survey reports for Bass Lake covering fish populations, stocking, water quality, and management. 2 reports on file.

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

Public boat-access points from the USGS National Boat Ramps inventory

Most recent sample: 2025-09-08

Monitoring stations: 1

Where to stay near Bass Lake

Compare lakeside cabins, hotels, and vacation rentals near Bass Lake in Oneida County, Wisconsin — live availability and prices for your trip.

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