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F

Helmer_nelson Pond East End Beaver House

Cook County, MinnesotaLimited DataEutrophic

Helmer_nelson Pond East End Beaver House earns an F: phosphorus readings still being added and clarity at 2.5 ft signal heavy nutrient loading from the surrounding watershed.

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, Helmer_nelson Pond East End Beaver House sits at rank 122, near the bottom of the county list.

Helmer_nelson Pond East End Beaver House 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 Helmer_nelson Pond East End Beaver House, which usually reflects a lack of formal fisheries survey work rather than an empty lake. 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 2021-09-21. 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 2.5 ft of visibility. Trophic State Index: 64.

MetricValueGrade
Water Clarity (Secchi Depth)2.5 ftF
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)64Eutrophic

High nutrients, frequent algae, reduced clarity

Water Quality Trend: Declining

Based on 4 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-14.114 m/yr3
Phosphorus Improving-4.3 µg/L/yr4
Chlorophyll-a Declining+4.56 µg/L/yr4
See year-by-year chart →

Location

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County Ranking

Ranked #122 of 128 lakes in Cook County

Cleaner Lakes Within 30 Miles

Helmer_nelson Pond East End Beaver House holds Grade F. 3 nearby lakes hold higher grades.

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