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LakeQuality
A

Margaret Lake

Polk County, WisconsinOligotrophic

On the LakeGrade rubric, Margaret Lake pulls an A: clarity at 50.9 ft and 11 µg/L of phosphorus put it in the top bracket for Wisconsin. 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.

Trophically, Margaret Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake is compact at 42 acres, with partial shoreline records and little volume to buffer nutrient inputs. Margaret Lake ranks 19 of 77 in Polk County, putting it in the upper tier of locally monitored lakes.

Margaret Lake has no invasive species recorded in Wisconsin state databases as of 2024, though prevention practices still apply at all access points. Bass fishing is part of the appeal: the species list runs to 3, anchored by largemouth and/or smallmouth bass. 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 2024-09-09. 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 50.9 ft down. Phosphorus level: 10.8 µg/L. Trophic State Index: 29.

MetricValueGrade
Water Clarity (Secchi Depth)50.9 ftA
Phosphorus10.8 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)29Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Surface Area42 acres

Fish Species

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

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

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

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

Water Quality Trend: Improving

Based on 2 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+4 m/yr2
Phosphorus Improving-0.5 µg/L/yr2
See year-by-year chart →

Location

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County Ranking

Ranked #19 of 77 lakes in Polk County

Nearby Lakes in Polk County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2024).

Fish Species (DNR-rated)

Panfish(Present)Largemouth Bass(Present)Northern Pike(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: 2024-09-09

Monitoring stations: 2