Skip to main content
LakeQuality
A

Bass Lake

Oconto County, WisconsinOligotrophic

On the LakeGrade rubric, Bass Lake pulls an A: clarity at 55.8 ft and 11 µg/L of phosphorus put it in the top bracket for Wisconsin. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

The lake's low TSI puts it in oligotrophic territory — the cleanest of the four trophic classes, but also the most vulnerable to nutrient-driven shifts. The lake bottoms out at 40 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. Bass Lake covers 145 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within Oconto County's 66 graded waters, Bass Lake sits at rank 7, near the top of the local distribution.

Bass Lake carries an invasive watermilfoil record — boat-launch decontamination and shoreline care matter more here than at uninfested lakes. Walleye are documented at Bass Lake, one of 3 fish species on record for the lake. A documented public access point at Bass Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. 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 2025-06-14. 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 55.8 ft down. Phosphorus level: 10.7 µg/L. Trophic State Index: 29.

MetricValueGrade
Water Clarity (Secchi Depth)55.8 ftA
Phosphorus10.7 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)29Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Maximum Depth40 ft
Surface Area145 acres
Public AccessYes

Fish Species

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

→ 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 Species

Banded Mystery SnailChinese Mystery SnailHybrid Eurasian / Northern Water-MilfoilRusty Crayfish

Water Quality Trend: Stable

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

MetricTrendChange/YearYears
Water Clarity Stable-0.102 m/yr7
Phosphorus Stable-0.05 µg/L/yr6

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

Loading map…

County Ranking

Ranked #7 of 66 lakes in Oconto County

Nearby Lakes in Oconto County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2000. 3 stations on file (most recent sample 2025).

DNR Assessment
Excellent · Deep Seepage lake
Trophic State Index 39 (oligotrophic) · 5-year average

Fish Species (DNR-rated)

Panfish(Common)Walleye(Common)Largemouth 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: 2025-06-14

Monitoring stations: 1