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LakeQuality
C

Lee Lake

Dakota County, MinnesotaEutrophic

Lee Lake sits at a C on the grading scale — not impaired, not pristine, with summer measurements that vary year to year. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. At only 14 ft deep, Lee Lake is shallow — wind keeps the water column mixed and sediment resuspension drives phosphorus levels harder to manage. Lee Lake is small — 21 acres alongside 1.1 miles of shoreline — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Among the 48 graded lakes in Dakota County, Lee Lake sits at rank 22, above the county median.

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. No formal public access is documented at Lee Lake — most use is by shoreline residents and their guests. Ice-out has been recorded 12 times at Lee Lake, with a median around Apr 1. Multiple sampling years from Minnesota PCA volunteers and partner agencies back the grade, so the letter should hold steady absent a major watershed shift.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-10-15. Grade methodology: LakeGrade methodology.

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Swimming Safety

Swim with caution, moderate algae may be present

Water Quality Grade: C, Fair

Murky, only visible to about 4.8 ft. Phosphorus level: 39 µg/L. Chlorophyll-a: 17 µg/L. Trophic State Index: 57.

MetricValueGrade
Water Clarity (Secchi Depth)4.8 ftD
Phosphorus39 µg/LC
Chlorophyll-a (Algae)17 µg/LC
Trophic State Index (TSI)57Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Maximum Depth14 ft
Surface Area21.19 acres
Shoreline Length1.1 mi
Littoral Zone100%
Public AccessNo

Water Quality Trend: Stable

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

MetricTrendChange/YearYears
Water Clarity Declining-0.215 m/yr3
Phosphorus Improving-3.5 µg/L/yr2

Ice Season

Historical ice data from Minnesota DNR (22 observations).

Typical Ice-Out
Apr 1
Typical Ice-In
Nov 27

Estimated open water season: 240 days

EarliestLatest
Ice-Out2024-02-27 (2024)2023-04-12 (2023)
Ice-In2014-11-11 (2014)2016-12-08 (2016)

Most recent ice-out: 2024-02-27

Location

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County Ranking

Ranked #22 of 48 lakes in Dakota County

Cleaner Lakes Within 30 Miles

Lee Lake holds Grade C. 4 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Dakota 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 5).

Causes of impairment

Mercury

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

Source: EPA ATTAINS assessment unit MN19-0027-00 · Official waterbody report · Matched by proximity (1.96 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

Lake details from Minnesota DNR LakeFinder

Ice data from Minnesota DNR Climate

Most recent sample: 2024-10-15

Monitoring stations: 1