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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.8 ft | D |
| Phosphorus | 39 µg/L | C |
| Chlorophyll-a (Algae) | 17 µg/L | C |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 14 ft |
| Surface Area | 21.19 acres |
| Shoreline Length | 1.1 mi |
| Littoral Zone | 100% |
| Public Access | No |
Water Quality Trend: → Stable
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.215 m/yr | 3 |
| Phosphorus | ↑ Improving | -3.5 µg/L/yr | 2 |
Ice Season
Historical ice data from Minnesota DNR (22 observations).
Estimated open water season: 240 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2024-02-27 (2024) | 2023-04-12 (2023) |
| Ice-In | 2014-11-11 (2014) | 2016-12-08 (2016) |
Most recent ice-out: 2024-02-27
Location
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.
- ALac Lavon LakeDakota County · mi · Two grade letters higher (C → A)
- CCrystal LakeDakota County · mi · Higher overall water quality score
- COrchard LakeDakota County · mi · Higher overall water quality score
- CSunset PondDakota County · mi · Higher overall water quality score
Nearby Lakes in Dakota County
More Minnesota Lake Rankings
State Parks Near Lee Lake
Other Grade C Lakes in Minnesota
Eutrophic Lakes in Minnesota
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
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