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.
Watch Indian Lake water quality
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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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 33.5 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.344 m/yr | 6 |
| Phosphorus | ↑ Improving | -2.43 µg/L/yr | 6 |
Location
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
More Wisconsin Lake Rankings
Other Grade C Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
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
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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