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F

Unnamed Lake

Ramsey County, MinnesotaHypereutrophic

On the LakeGrade rubric Unnamed Lake fails the cutoffs — a TSI of 78 and persistent algal pressure put it in the bottom tier. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.

A TSI above 70 puts Unnamed Lake in hypereutrophic territory: visible blooms are common, and clarity rarely climbs even in early summer. 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. Unnamed Lake ranks 43 of 49 in Ramsey County — at the lower end of the locally monitored distribution.

Eurasian watermilfoil has been documented at Unnamed Lake, requiring shoreline management to keep dense mats from crowding native vegetation. The state fisheries records do not list documented species for Unnamed 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 6 times at Unnamed Lake, with a median around Mar 31. 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 2024-09-25. 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 1 ft of visibility. Phosphorus level: 172.5 µg/L. Trophic State Index: 78.

MetricValueGrade
Water Clarity (Secchi Depth)1 ftF
Phosphorus172.5 µg/LF
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)78Hypereutrophic

Very high nutrients, dense algae, poor clarity

Invasive & Introduced Species

Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.

Eurasian watermilfoil

Water Quality Trend: Stable

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

MetricTrendChange/YearYears
Water Clarity Declining-0.225 m/yr3
Phosphorus Improving-3 µg/L/yr5
See year-by-year chart →

Ice Season

Historical ice data from Minnesota DNR (12 observations).

Typical Ice-Out
Mar 31
Typical Ice-In
Dec 1

Estimated open water season: 245 days

EarliestLatest
Ice-Out2024-03-02 (2024)2018-04-26 (2018)
Ice-In2022-11-21 (2022)2016-12-07 (2016)

Most recent ice-out: 2024-03-02

Location

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County Ranking

Ranked #43 of 49 lakes in Ramsey County

Cleaner Lakes Within 30 Miles

Unnamed Lake holds Grade F. 5 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Ramsey County

Hypereutrophic Lakes in Minnesota

EPA Impairment Status

Unnamed 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 MN62-0126-00 · Official waterbody report

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: 2024-09-25

Monitoring stations: 3