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.
Watch Minocqua Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.8 ft | B |
| Phosphorus | 13.7 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 60 ft |
| Surface Area | 1,339 acres |
| Public Access | Yes |
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.
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -1 m/yr | 2 |
| Phosphorus | → Stable | +0.19 µg/L/yr | 6 |
Recreation & Access
Location
County Ranking
Ranked #33 of 134 lakes in Oneida County
Nearby Lakes in Oneida County
More Wisconsin Lake Rankings
Other Grade A Lakes in Wisconsin
Washington County · Clarity: 11.8 ft
Washington County · Clarity: 12.6 ft
Walworth County · Clarity: 11 ft
Waukesha County · Clarity: 11.3 ft
Walworth County · Clarity: 20.2 ft
Kenosha County · Clarity: 10 ft
Mesotrophic Lakes in Wisconsin
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).
Fish Species (DNR-rated)
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.
- 2024Minocqua Lake summary survey, 2024Fisheries Survey · WI DNR · 2024 (PDF)
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.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.