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LakeQuality
B

Carlson Lake

Dakota County, MinnesotaMesotrophic

Carlson Lake comes in at a B on the grading rubric — a respectable showing for a Minnesota lake of its size and depth. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. The lake bottoms out at 19 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. At 12 acres, Carlson Lake sits below the Minnesota median: a small water where shoreline activity has an outsized effect on water quality. Carlson Lake ranks 9 of 36 in Dakota County, putting it in the upper tier of locally monitored lakes.

Carlson Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. The fishery includes walleye alongside the lake's other 6 documented species — a notable draw for Minnesota anglers. No formal public access is documented at Carlson Lake — most use is by shoreline residents and their guests. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-09-30. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Moderate clarity, visible to about 8 ft. Phosphorus level: 26 µg/L. Trophic State Index: 49.

MetricValueGrade
Water Clarity (Secchi Depth)8 ftC
Phosphorus26 µg/LB
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)49Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth19 ft
Average Depth11.9 ft
Surface Area12.01 acres
Shoreline Length0.6 mi
Littoral Zone70%
Public AccessNo

Fish Species

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

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

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

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

Water Quality Trend: Declining

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

MetricTrendChange/YearYears
Water Clarity Declining-0.151 m/yr5
Phosphorus Declining+2.8 µg/L/yr5
Chlorophyll-a Declining+0.4 µg/L/yr2

Location

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County Ranking

Ranked #9 of 36 lakes in Dakota County

Nearby Lakes in Dakota County

DNR Fisheries Survey Summary

6 surveys on file from MN DNR Fisheries. Most recent: 2022-06-23 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Largemouth Bass36.841.03 lb
Black Bullhead23.670.39 lb
Bluegill14.290.13 lb
Black Crappie8.620.15 lb
GOS6.600.11 lb
Channel Catfish3.922 lb

CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.

Length Distributions

Number of fish caught at each inch class in the most recent survey that recorded lengths. Red dashed line marks an approximate trophy threshold for that species.

Largemouth Bass

18 fish · 411 in · 2022-06-23
6304567891011

Black Bullhead

1 fish · 99 in · 2012-07-30
109

Bluegill

35 fish · 17 in · 2012-07-30
17901234567

Black Crappie

13 fish · 38 in · 2012-07-30
950345678

From the 2022-06-23 survey

Carlson Lake (19-0066-00), as it's now officially known is located in the city of Eagan. The lake drops off rather quickly to a maximum of 19 feet with approximately 26% of the surface area over 15 feet. Although an aeration system is operated (as needed) to prevent winterkill, city staff report it is not often…

Source: MN DNR LakeFinder Fisheries Lake Survey

DNR Reports & Resources

Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Carlson Lake. 2 reports on file.

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Lake details from Minnesota DNR LakeFinder

Most recent sample: 2024-09-30

Monitoring stations: 1