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Moshawquit Lake

Menominee County, WisconsinOligotrophic

Moshawquit Lake sits at the top of the Wisconsin DNR grading rubric with an A, a mark reached by the cleanest lakes in Wisconsin. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

The lake's low TSI puts it in oligotrophic territory — the cleanest of the four trophic classes, but also the most vulnerable to nutrient-driven shifts. Moshawquit Lake reaches 30 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. At 301 acres, Moshawquit Lake fits the Wisconsin median for monitored lakes, with partial shoreline records. Within Menominee County's 5 graded lakes, Moshawquit Lake ranks 3 — below the local median, though not at the bottom.

Zebra mussel presence at Moshawquit Lake means the lake's clarity numbers carry an asterisk — filtered water is not the same as nutrient-poor water. Bass fishing is part of the appeal: the species list runs to 4, anchored by largemouth and/or smallmouth bass. 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 2025-10-17. Grade methodology: LakeGrade methodology.

Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Crystal clear, you can see 29.5 ft down. Phosphorus level: 15.1 µg/L. Trophic State Index: 36.

MetricValueGrade
Water Clarity (Secchi Depth)29.5 ftA
Phosphorus15.1 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)36Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Maximum Depth30 ft
Surface Area301 acres

Fish Species

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

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

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

Moshawquit Lake fishing regulations (limits, seasons, special rules)

Invasive Species

Banded Mystery SnailChinese Mystery SnailCurly-Leaf PondweedEurasian Water-MilfoilHybrid Eurasian / Northern Water-MilfoilZebra Mussel

Water Quality Trend: Declining

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

MetricTrendChange/YearYears
Water Clarity Declining-0.536 m/yr7
Phosphorus Stable-0.25 µg/L/yr6
See year-by-year chart →

Location

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County Ranking

Ranked #3 of 5 lakes in Menominee County

Nearby Lakes in Menominee County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2014. 5 stations on file (most recent sample 2026).

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

Fish Species (DNR-rated)

Northern Pike(Abundant)Panfish(Present)Largemouth Bass(Present)Trout(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

Most recent sample: 2025-10-17

Monitoring stations: 1