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Minocqua Lake

Oneida County, WisconsinMesotrophic

Minocqua Lake sits at the top of the Wisconsin DNR grading rubric with an A, a mark reached by the cleanest lakes in Wisconsin. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

Mesotrophic conditions dominate at Minocqua Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. The lake's 60 ft maximum depth is in the upper tier for Wisconsin — deep enough for cold-water fish to find refuge in summer. At 1,339 acres, Minocqua Lake is one of the larger lakes in Oneida County, with partial shoreline records supporting multiple distinct use patterns. Within Oneida County's 134 graded waters, Minocqua Lake sits at rank 33, near the top of the local distribution.

Eurasian watermilfoil is established at Minocqua Lake, which can dampen recreational access and pressure the native plant community. Walleye are documented at Minocqua Lake, one of 6 fish species on record for the lake. 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 2026-04-29. Grade methodology: LakeGrade methodology.

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Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Good clarity, visible to about 14.8 ft. Phosphorus level: 13.7 µg/L. Trophic State Index: 40.

MetricValueGrade
Water Clarity (Secchi Depth)14.8 ftB
Phosphorus13.7 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)40Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth60 ft
Surface Area1,339 acres
Public AccessYes

Fish Species

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

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

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

Minocqua 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.

Banded Mystery SnailChinese Mystery SnailCurly-Leaf PondweedEurasian Water-MilfoilHybrid Eurasian / Northern Water-MilfoilPurple LoosestrifeRusty CrayfishFlowering Rush

Water Quality Trend: Declining

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

MetricTrendChange/YearYears
Water Clarity Declining-1 m/yr2
Phosphorus Stable+0.19 µg/L/yr6
See year-by-year chart →

Recreation & Access

5
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #33 of 134 lakes in Oneida County

Nearby Lakes in Oneida County

Compare Minocqua Lake With Nearby Lakes

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 14 stations on file (most recent sample 2025).

DNR Assessment
Reported
Trophic State Index 44 (mesotrophic) · 5-year average

Fish Species (DNR-rated)

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

DNR Reports & Resources

Wisconsin DNR Fisheries scientists publish multi-year survey reports for Minocqua Lake covering fish populations, stocking, water quality, and management. 1 report on file.

Reservoir Info (USACE NID)

Minocqua Lake is a man-made reservoir impounded by the Minocqua (completed 1909), built primarily for hydroelectric on the Tomahawk River; gravity-type dam, 9 ft tall and 285 ft long.

Max storage
166,276 ac-ft
Drainage area
72.5 sq mi
Hazard class
Low
Owner
Wisconsin Valley Improvement Company

All listed purposes: Hydroelectric;Flood Risk Reduction.

Source: USACE National Inventory of Dams, NID ID WI00767 · Operator website

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: 2026-04-29

Monitoring stations: 2

Where to stay near Minocqua Lake

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

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