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.
Watch Gilmore Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.5 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 24 ft |
| Surface Area | 314 acres |
| Public Access | Yes |
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.
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.029 m/yr | 6 |
| Phosphorus | ↑ Improving | -0.7 µg/L/yr | 5 |
Recreation & Access
Location
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
More Wisconsin Lake Rankings
Other Grade C Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station 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: 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.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.