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LakeQuality
B

Sucker Bay Lake

Cass County, MinnesotaMesotrophic

Sucker Bay Lake comes in at a B on the grading rubric — a respectable showing for a Minnesota lake of its size and depth. Secchi readings are the weakest of the three parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Within the 133 graded lakes of Cass County, Sucker Bay Lake sits at rank 105, near the bottom of the county list.

Zebra mussel presence at Sucker Bay Lake means the lake's clarity numbers carry an asterisk — filtered water is not the same as nutrient-poor water. The state fisheries records do not list documented species for Sucker Bay Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. Public access is available — the lake is on the Minnesota PCA public-access list. Ice-out has been logged at Sucker Bay Lake more than two dozen times, putting the median around Apr 28 — a useful baseline for tracking climate trends. 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, Minnesota DNR LakeFinder, last sampled 2023-09-07. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Moderate clarity, visible to about 8.8 ft. Chlorophyll-a: 4.1 µg/L. Trophic State Index: 45.

MetricValueGrade
Water Clarity (Secchi Depth)8.8 ftC
PhosphorusNo data
Chlorophyll-a (Algae)4.1 µg/LA
Trophic State Index (TSI)45Mesotrophic

Moderate nutrients, good water quality

Invasive Species

Eurasian watermilfoilstarry stonewortzebra mussel

Water Quality Trend: Stable

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

MetricTrendChange/YearYears
Water Clarity Declining-0.08 m/yr2
Chlorophyll-a Improving-0.8 µg/L/yr2

Ice Season

Historical ice data from Minnesota DNR (74 observations).

Typical Ice-Out
Apr 28
Typical Ice-In
Nov 14

Estimated open water season: 200 days

EarliestLatest
Ice-Out1945-04-09 (1945)1950-05-23 (1950)
Ice-In2018-11-13 (2018)2021-11-25 (2021)

Most recent ice-out: 2022-05-08

Location

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County Ranking

Ranked #105 of 133 lakes in Cass County

Nearby Lakes in Cass County

DNR Reports & Resources

Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Sucker Bay Lake. 1 report on file.

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Ice data from Minnesota DNR Climate

Most recent sample: 2023-09-07

Monitoring stations: 1