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LakeQuality
F

Mt Maud Lake Beaver Dam

Cook County, MinnesotaLimited DataEutrophic

On the LakeGrade rubric Mt Maud Lake Beaver Dam fails the cutoffs — a TSI of 62 and persistent algal pressure put it in the bottom tier. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. 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 128 graded lakes of Cook County, Mt Maud Lake Beaver Dam sits at rank 114, near the bottom of the county list.

Mt Maud Lake Beaver Dam has no invasive species recorded in Minnesota state databases as of 2021, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Mt Maud Lake Beaver Dam, which usually reflects a lack of formal fisheries survey work rather than an empty lake. 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 2021-09-21. Grade methodology: LakeGrade methodology.

Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

Very murky, less than 2.9 ft of visibility. Trophic State Index: 62.

MetricValueGrade
Water Clarity (Secchi Depth)2.9 ftF
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)62Eutrophic

High nutrients, frequent algae, reduced clarity

Water Quality Trend: Improving

Based on 3 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+0.05 m/yr3

Location

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County Ranking

Ranked #114 of 128 lakes in Cook County

Nearby Lakes in Cook County

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2021-09-21

Monitoring stations: 1