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.
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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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 77 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.515 m/yr | 5 |
| Phosphorus | ↓ Declining | +2.8 µg/L/yr | 5 |
Location
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.
- AGeorge LakeKandiyohi County · mi · Two grade letters higher (F → A)
- AHenderson LakeKandiyohi County · mi · Two grade letters higher (F → A)
- BFlorida LakeKandiyohi County · mi · Two grade letters higher (F → B)
- CMiddle LakeKandiyohi County · mi · Two grade letters higher (F → C)
- DNorway LakeKandiyohi County · mi · Higher grade (F → D)
Nearby Lakes in Kandiyohi County
More Minnesota Lake Rankings
State Parks Near Florida Slough Lake
Other Grade F 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.
- —Aquatic Plant Report — Florida Slough (1397)Aquatic Plant Report · MN DNR LakeFinder
- —Public Water Access Sites — Florida SloughPublic Water Access Sites · MN DNR LakeFinder
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
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