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B

Unnamed Lake

Dakota County, MinnesotaMesotrophic

On the LakeGrade scale Unnamed Lake grades a B, with clarity at 6.9 ft and 25 µg/L of phosphorus placing it above the Minnesota median. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.

Mesotrophic conditions dominate at Unnamed Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. 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. Among the 36 graded lakes in Dakota County, Unnamed Lake ranks 6 — in the top quartile locally.

No invasive species are currently listed at Unnamed Lake — the lake remains off the Minnesota infested-waters roster. Bass fishing is part of the appeal: the species list runs to 3, anchored by largemouth and/or smallmouth bass. No formal public access is documented at Unnamed Lake — most use is by shoreline residents and their guests. 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 2024-09-26. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Moderate clarity, visible to about 6.9 ft. Phosphorus level: 25 µg/L. Trophic State Index: 50.

MetricValueGrade
Water Clarity (Secchi Depth)6.9 ftC
Phosphorus25 µg/LB
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)50Mesotrophic

Moderate nutrients, good water quality

Fish Species

black bullhead,bluegill,largemouth bass

Click a species to see all Minnesota and Wisconsin lakes where it is found.

→ Best fishing times for Unnamed Lake (14-day solunar calendar)

→ Is it safe to eat fish from Unnamed Lake? (mercury & PFAS guide)

Unnamed Lake fishing regulations (limits, seasons, special rules)

Water Quality Trend: Stable

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

MetricTrendChange/YearYears
Water Clarity Improving+0.04 m/yr5
Phosphorus Declining+6.75 µg/L/yr5
See year-by-year chart →

Location

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County Ranking

Ranked #6 of 36 lakes in Dakota County

Cleaner Lakes Within 30 Miles

Unnamed Lake holds Grade B. 2 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Dakota County

DNR Reports & Resources

Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Unnamed Lake. 1 report on file.

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 MN19-0064-00 · 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

Most recent sample: 2024-09-26

Monitoring stations: 12