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LakeQuality
C

Gilmore Lake

Oneida County, WisconsinLimited DataMesotrophic

Gilmore Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI near 46 places Gilmore Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. A maximum depth of 24 ft puts Gilmore Lake in the middle of Wisconsin's depth distribution. At 314 acres, Gilmore Lake fits the Wisconsin median for monitored lakes, with partial shoreline records. Within Oneida County's 134 graded lakes, Gilmore Lake ranks 84 — below the local median, though not at the bottom.

An invasive species record — Chinese Mystery Snail — has been logged at Gilmore Lake; Wisconsin DNR maintains the official infested-waters list. Walleye are documented at Gilmore Lake, one of 5 fish species on record for the lake. Public access is available — the lake is on the Wisconsin DNR public-access list. 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 2025-06-06. Grade methodology: LakeGrade methodology.

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Moderate clarity, visible to about 8.5 ft. Trophic State Index: 46.

MetricValueGrade
Water Clarity (Secchi Depth)8.5 ftC
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)46Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth24 ft
Surface Area314 acres
Public AccessYes

Fish Species

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

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

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

Gilmore Lake 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.

Chinese Mystery SnailCurly-Leaf Pondweed

Water Quality Trend: Improving

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

MetricTrendChange/YearYears
Water Clarity Stable-0.029 m/yr6
Phosphorus Improving-0.7 µg/L/yr5
See year-by-year chart →

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #84 of 134 lakes in Oneida County

Cleaner Lakes Within 30 Miles

Gilmore Lake holds Grade C. One nearby lake has a higher grade.

Nearby Lakes in Oneida County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2025).

Fish Species (DNR-rated)

Panfish(Abundant)Musky(Common)Largemouth Bass(Common)Northern Pike(Common)Walleye(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: 2025-06-06

Monitoring stations: 1

Where to stay near Gilmore Lake

Compare lakeside cabins, hotels, and vacation rentals near Gilmore Lake in Oneida County, Wisconsin — live availability and prices for your trip.

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