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D

Lee Lake

Becker County, MinnesotaLimited DataEutrophic

Lee Lake earns a D — measurements through 2024 show persistent nutrient pressure that limits clarity through the summer.

At a TSI of 51, Lee Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. 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. Lee Lake ranks 87 of 93 in Becker County — at the lower end of the locally monitored distribution.

Lee Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Lee Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The lake lacks a documented public access point, so visitor use is limited. Ice-out has been recorded 17 times at Lee Lake, with a median around Apr 15. 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 2024-09-20. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Murky, only visible to about 6 ft. Trophic State Index: 51.

MetricValueGrade
Water Clarity (Secchi Depth)6 ftD
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)51Eutrophic

High nutrients, frequent algae, reduced clarity

Water Quality Trend: Improving

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

MetricTrendChange/YearYears
Water Clarity Improving+0.244 m/yr5
See year-by-year chart →

Ice Season

Historical ice data from Minnesota DNR (34 observations).

Typical Ice-Out
Apr 15
Typical Ice-In
Nov 21

Estimated open water season: 220 days

EarliestLatest
Ice-Out2024-03-17 (2024)2013-05-08 (2013)
Ice-In1991-10-25 (1991)2006-11-30 (2006)

Most recent ice-out: 2024-03-17

Location

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County Ranking

Ranked #87 of 93 lakes in Becker County

Cleaner Lakes Within 30 Miles

Lee Lake holds Grade D. 5 nearby lakes hold higher grades.

Nearby Lakes in Becker County

EPA Impairment Status

Lee Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Nutrients (phosphorus, nitrogen)

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

Source: EPA ATTAINS assessment unit MN03-0619-00 · Official waterbody report · Matched by proximity (0.27 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

Ice data from Minnesota DNR Climate

Most recent sample: 2024-09-20

Monitoring stations: 1