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C

Lake Nokomis

Oneida County, WisconsinEutrophic

The LakeGrade rubric puts Lake Nokomis at a C: clarity at 4.3 ft, 36 µg/L of phosphorus, and a TSI of 56 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.

At a TSI of 56, Lake Nokomis reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. A maximum depth of 33 ft puts Lake Nokomis in the middle of Wisconsin's depth distribution. At 2,274 acres, Lake Nokomis is one of the larger lakes in Oneida County, with partial shoreline records supporting multiple distinct use patterns. Lake Nokomis sits at rank 96 of 134 in Oneida County, in the lower half of the local distribution.

Eurasian watermilfoil is established at Lake Nokomis, which can dampen recreational access and pressure the native plant community. The fishery includes walleye alongside the lake's other 6 documented species — a notable draw for Wisconsin anglers. Public access is available — the lake is on the Wisconsin DNR public-access list. 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 2022-10-26. Grade methodology: LakeGrade methodology.

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 4.3 ft. Phosphorus level: 36.2 µg/L. Trophic State Index: 56.

MetricValueGrade
Water Clarity (Secchi Depth)4.3 ftD
Phosphorus36.2 µg/LC
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)56Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Maximum Depth33 ft
Surface Area2,274 acres
Public AccessYes

Fish Species

Click a species to see every graded lake where it is documented.

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

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

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

Invasive & Introduced Species

Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.

Banded Mystery SnailChinese Mystery SnailCurly-Leaf PondweedEurasian Water-MilfoilPurple LoosestrifeRusty Crayfish

Water Quality Trend: Declining

Based on 3 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.05 m/yr3
Phosphorus Stable+0.25 µg/L/yr3

Recreation & Access

4
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #96 of 134 lakes in Oneida County

Cleaner Lakes Within 30 Miles

Lake Nokomis holds Grade C. 3 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Oneida County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 13 stations on file (most recent sample 2025).

Fish Species (DNR-rated)

Panfish(Common)Largemouth Bass(Common)Northern Pike(Common)Walleye(Common)Musky(Present)Smallmouth 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

Public boat-access points from the USGS National Boat Ramps inventory

Most recent sample: 2022-10-26

Monitoring stations: 4

Where to stay near Lake Nokomis

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