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Rooney Lake

Burnett County, WisconsinMesotrophic

Rooney Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Burnett County. 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.

The lake sits in the mesotrophic zone — the band where most well-managed Wisconsin lakes fall. The lake bottoms out at 30 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. Rooney Lake covers 329 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Among the 57 graded lakes in Burnett County, Rooney Lake sits at rank 16, above the county median.

An invasive species record — Chinese Mystery Snail — has been logged at Rooney Lake; Wisconsin DNR maintains the official infested-waters list. Walleye are documented at Rooney Lake, one of 4 fish species on record for the lake. A documented public access point at Rooney Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. 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 2026-06-02. 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 11 ft. Phosphorus level: 16.7 µg/L. Trophic State Index: 44.

MetricValueGrade
Water Clarity (Secchi Depth)11 ftB
Phosphorus16.7 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)44Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth30 ft
Surface Area329 acres
Public AccessYes

Fish Species

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

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

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

Rooney 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 SnailPurple Loosestrife

Water Quality Trend: Declining

Based on 7 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Stable-0.121 m/yr6
Phosphorus Declining+2.45 µg/L/yr7
See year-by-year chart →

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #16 of 57 lakes in Burnett County

Nearby Lakes in Burnett County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1988. 2 stations on file (most recent sample 2025).

Fish Species (DNR-rated)

Largemouth Bass(Abundant)Panfish(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: 2026-06-02

Monitoring stations: 1

Where to stay near Rooney Lake

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