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Florida Slough Lake

Kandiyohi County, MinnesotaLimited DataHypereutrophic

Florida Slough Lake grades an F: every scored parameter (clarity) rates poorly, placing it among the most stressed lakes monitored in Minnesota.

Hypereutrophic conditions mean the lake is operating at the upper end of the productivity scale, with all the bloom risk that implies. 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 35 graded lakes of Kandiyohi County, Florida Slough Lake sits at rank 30, near the bottom of the county list.

Florida Slough Lake has no invasive species recorded in Minnesota state databases as of 2023, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Florida Slough 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. 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, Minnesota DNR LakeFinder, last sampled 2023-06-23. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

Very murky, less than 1 ft of visibility. Trophic State Index: 77.

MetricValueGrade
Water Clarity (Secchi Depth)1 ftF
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)77Hypereutrophic

Very high nutrients, dense algae, poor clarity

Water Quality Trend: Declining

Based on 5 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.515 m/yr5
Phosphorus Declining+2.8 µg/L/yr5
See year-by-year chart →

Location

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County Ranking

Ranked #30 of 35 lakes in Kandiyohi County

Cleaner Lakes Within 30 Miles

Florida Slough Lake holds Grade F. 5 nearby lakes hold higher grades.

Nearby Lakes in Kandiyohi County

Hypereutrophic Lakes in Minnesota

DNR Reports & Resources

Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Florida Slough Lake. 2 reports on file.

EPA Impairment Status

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

Causes of impairment

Impaired biota (cause unknown)Mercury

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MN34-0217-00 · Official waterbody report · Matched by proximity (1.5 km)

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: 2023-06-23

Monitoring stations: 1