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LakeQuality
C

Potter Lake

Walworth County, WisconsinEutrophic

Potter Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. 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.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. Potter Lake reaches 26 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. Potter Lake covers 155 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within the 34 graded lakes of Walworth County, Potter Lake sits at rank 30, near the bottom of the county list.

Zebra mussel presence at Potter Lake means the lake's clarity numbers carry an asterisk — filtered water is not the same as nutrient-poor water. Bass fishing is part of the appeal: the species list runs to 3, anchored by largemouth and/or smallmouth bass. A documented public access point at Potter Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2020-10-07. Grade methodology: LakeGrade methodology.

Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 3.9 ft. Phosphorus level: 35 µg/L. Trophic State Index: 56.

MetricValueGrade
Water Clarity (Secchi Depth)3.9 ftD
Phosphorus35 µg/LC
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)56Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Maximum Depth26 ft
Surface Area155 acres
Public AccessYes

Fish Species

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

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

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

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

Invasive Species

Curly-Leaf PondweedEurasian Water-MilfoilHybrid Eurasian / Northern Water-MilfoilZebra Mussel

Water Quality Trend: Improving

Based on 2 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+0.3 m/yr2
See year-by-year chart →

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #30 of 34 lakes in Walworth County

Cleaner Lakes Within 30 Miles

Potter Lake holds Grade C. 5 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Walworth County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 2 stations on file (most recent sample 2020).

Fish Species (DNR-rated)

Panfish(Abundant)Largemouth Bass(Abundant)Northern Pike(Common)

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: 2020-10-07

Monitoring stations: 1