Cut Foot Sioux Lake
Itasca County, MinnesotaMesotrophic
Cut Foot Sioux Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. 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.
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. Cut Foot Sioux Lake sits at rank 100 of 141 in Itasca County, in the lower half of the local distribution.
Zebra mussels have been documented at Cut Foot Sioux Lake, which alters the filter-feeding balance and can paradoxically increase water clarity while disrupting the food web. The state fisheries records do not list documented species for Cut Foot Sioux Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. A documented public access point at Cut Foot Sioux Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The grade is supported by multiple sampling years from Minnesota PCA volunteers and partner agencies, giving the letter a reasonably stable foundation.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-10-14. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 8.5 ft. Phosphorus level: 30 µg/L. Chlorophyll-a: 6.2 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.5 ft | C |
| Phosphorus | 30 µg/L | C |
| Chlorophyll-a (Algae) | 6.2 µg/L | B |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.82 m/yr | 2 |
| Chlorophyll-a | ↑ Improving | -4.3 µg/L/yr | 2 |
Location
County Ranking
Ranked #100 of 141 lakes in Itasca County
Cleaner Lakes Within 30 Miles
Cut Foot Sioux Lake holds Grade C. 3 nearby lakes hold higher grades.
- ATamarack Bay LakeCass County · mi · Two grade letters higher (C → A)
- BGreeley LakeItasca County · mi · Higher grade (C → B)
- BSchoolhouse LakeItasca County · mi · Higher grade (C → B)
Nearby Lakes in Itasca County
More Minnesota Lake Rankings
State Parks Near Cut Foot Sioux Lake
Other Grade C Lakes in Minnesota
Mesotrophic Lakes in Minnesota
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Cut Foot Sioux Lake. 1 report on file.
- —Public Water Access Sites — Cut Foot Sioux(Main Bay)Public Water Access Sites · MN DNR LakeFinder
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-10-14
Monitoring stations: 3