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.
Watch Lake Nokomis water quality
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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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.3 ft | D |
| Phosphorus | 36.2 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 56 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 33 ft |
| Surface Area | 2,274 acres |
| Public Access | Yes |
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.
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.05 m/yr | 3 |
| Phosphorus | → Stable | +0.25 µg/L/yr | 3 |
Recreation & Access
Location
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.
- AClear LakeLincoln County · mi · Two grade letters higher (C → A)
- AManson LakeOneida County · mi · Two grade letters higher (C → A)
- BHalfmoon LakeLincoln County · mi · Higher grade (C → B)
Nearby Lakes in Oneida County
More Wisconsin Lake Rankings
Other Grade C Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Compare Lake Nokomis With Nearby Lakes
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 13 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
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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