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B

Lake Minnesuing

Douglas County, WisconsinMesotrophic

Lake Minnesuing carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. Secchi readings are the weakest of the scored parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

A TSI near 48 places Lake Minnesuing in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. A maximum depth of 43 ft puts Lake Minnesuing in the middle of Wisconsin's depth distribution. The lake's 450 acres and partial shoreline records put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Lake Minnesuing ranks 18 of 40 in Douglas County — solidly in the upper half of the local distribution.

Lake Minnesuing has at least one documented invasive species (Chinese Mystery Snail), so boaters and anglers should observe clean-drain-dry steps when leaving the lake. The fishery includes walleye among the lake's 5 documented species — a notable draw for Wisconsin anglers. 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 2025-07-27. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Murky, only visible to about 6.2 ft. Phosphorus level: 16.2 µg/L. Trophic State Index: 48.

MetricValueGrade
Water Clarity (Secchi Depth)6.2 ftD
Phosphorus16.2 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)48Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth43 ft
Surface Area450 acres

Fish Species

Click a species to see all Wisconsin and Minnesota lakes where it is found.

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

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

Lake Minnesuing 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 PondweedPurple LoosestrifeRusty Crayfish

Water Quality Trend: Stable

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

MetricTrendChange/YearYears
Water Clarity Declining-0.335 m/yr5
Phosphorus Improving-1.08 µg/L/yr6
See year-by-year chart →

Location

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County Ranking

Ranked #18 of 40 lakes in Douglas County

Cleaner Lakes Within 30 Miles

Lake Minnesuing holds Grade B. One nearby lake has a higher grade.

See full comparison →

Nearby Lakes in Douglas County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1991. 5 stations on file (most recent sample 2025).

DNR Assessment
Excellent · Deep Lowland lake
Trophic State Index 46 (mesotrophic) · 5-year average

Fish Species (DNR-rated)

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

DNR Reports & Resources

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

EPA Impairment Status

Lake Minnesuing is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Mercury

Source: EPA ATTAINS assessment unit WI10008906 · Official waterbody report

Data Sources

Water quality data from the EPA Water Quality Portal

Impairment status from EPA ATTAINS 303(d) database

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-07-27

Monitoring stations: 2