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C

Indian Lake

Oneida County, WisconsinLimited DataEutrophic

The LakeGrade rubric puts Indian Lake at a C: clarity readings still being added, 34 µg/L of phosphorus, and a TSI of 55 signal an intermediate trophic state. 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.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. 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 Oneida County's 134 graded lakes, Indian Lake ranks 69 — below the local median, though not at the bottom.

No invasive species are currently listed at Indian Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Indian 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 2022-07-12. Grade methodology: LakeGrade methodology.

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

No clarity data. Phosphorus level: 33.5 µg/L. Trophic State Index: 55.

MetricValueGrade
Water Clarity (Secchi Depth)No data
Phosphorus33.5 µg/LC
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)55Eutrophic

High nutrients, frequent algae, reduced clarity

Water Quality Trend: Improving

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

MetricTrendChange/YearYears
Water Clarity Improving+0.344 m/yr6
Phosphorus Improving-2.43 µg/L/yr6
See year-by-year chart →

Location

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County Ranking

Ranked #69 of 134 lakes in Oneida County

Cleaner Lakes Within 30 Miles

Indian Lake holds Grade C. 4 nearby lakes hold higher grades.

Nearby Lakes in Oneida County

EPA Impairment Status

Indian Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Cause unknown

Source: EPA ATTAINS assessment unit WI10007295 · Official waterbody report · Matched by proximity (1.77 km)

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

Most recent sample: 2022-07-12

Monitoring stations: 1

Where to stay near Indian Lake

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