Potato Lake
Rusk County, WisconsinLimited DataEutrophic
Potato Lake grades an F: water clarity, phosphorus, and chlorophyll-a all rate poorly, placing it among the most stressed lakes monitored in Wisconsin. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.
Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Within the 12 graded lakes of Rusk County, Potato Lake sits at rank 12, near the bottom of the county list.
No invasive species are currently listed at Potato Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Potato Lake, which usually reflects a lack of formal fisheries survey work rather than an empty 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 2026-06-21. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 3 ft of visibility. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Recreation & Access
Location
County Ranking
Ranked #12 of 12 lakes in Rusk County
Cleaner Lakes Within 30 Miles
Potato Lake holds Grade F. 4 nearby lakes hold higher grades.
Nearby Lakes in Rusk County
More Wisconsin Lake Rankings
State Parks Near Potato Lake
Other Grade F Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Potato Lake covering fish populations, stocking, water quality, and management. 1 report on file.
- 2021Potato Lake netting and shocking survey 2019, 2021Netting Survey · WI DNR · 2021 (PDF)
EPA Impairment Status
Potato Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10009222 · Official waterbody report
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2026-06-21
Monitoring stations: 2
Where to stay near Potato Lake
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