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C

Fish Lake

Scott County, MinnesotaEutrophic

Fish Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. The lake bottoms out at 28 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. The lake's 176 acres and 2.3 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Fish Lake ranks 8 of 17 in Scott County — solidly in the upper half of the local distribution.

Fish Lake has no invasive species recorded in Minnesota state databases as of 2023, though prevention practices still apply at all access points. Walleye are documented at Fish Lake, one of 14 fish species on record for the lake. A documented public access point at Fish Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The lake has a partial ice record — 12 observed ice-outs, centered near Apr 3. 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 2023-10-10. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 3.9 ft. Phosphorus level: 53.2 µg/L. Trophic State Index: 59.

MetricValueGrade
Water Clarity (Secchi Depth)3.9 ftD
Phosphorus53.2 µg/LC
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)59Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Maximum Depth28 ft
Surface Area175.92 acres
Shoreline Length2.3 mi
Littoral Zone42%
Public AccessYes

Fish Species

black crappie,bluegill,brown bullhead,common carp,green sunfish,hybrid sunfish,largemouth bass,northern pike,pumpkinseed,walleye,white crappie,white sucker,yellow bullhead,yellow perch

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

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

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

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

Water Quality Trend: Stable

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

MetricTrendChange/YearYears
Water Clarity Improving+0.272 m/yr4
Phosphorus Declining+2.65 µg/L/yr3
See year-by-year chart →

Ice Season

Historical ice data from Minnesota DNR (31 observations).

Typical Ice-Out
Apr 3
Typical Ice-In
Nov 29

Estimated open water season: 240 days

EarliestLatest
Ice-Out2012-03-17 (2012)2013-04-28 (2013)
Ice-In2014-11-25 (2014)2012-12-11 (2012)

Most recent ice-out: 2020-03-28

Location

Loading map…

County Ranking

Ranked #8 of 17 lakes in Scott County

Cleaner Lakes Within 30 Miles

Fish Lake holds Grade C. 2 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Scott County

DNR Fisheries Survey Summary

12 surveys on file from MN DNR Fisheries. Most recent: 2025-07-14 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Bluegill41.810.21 lb
Yellow Perch13.570.15 lb
Black Crappie12.640.26 lb
Bluntnose Minnow9.12
Largemouth Bass6.231.01 lb
Yellow Bass4.600.71 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.

Bluegill

171 fish · 28 in · 2025-07-14
884402345678

Yellow Perch

20 fish · 610 in · 2024-06-21
740678910

Black Crappie

16 fish · 311 in · 2025-07-14
530trophy 1034567891011

Bluntnose Minnow

2 fish · 12 in · 2003-06-23
1012

From the 2025-07-14 survey

A targeted survey of nearshore fish species in Fish Lake was conducted on July 14- 15, 2025, by Lake Biological Monitoring and Assessment Program (LBMA) staff. Sampling sites were evenly spaced around the lake, and each was sampled by backpack electrofishing and seining with a 50-foot or 15-foot seine, where possible.…

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 Fish Lake. 3 reports on file.

EPA Impairment Status

Fish Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

MercuryNutrients (phosphorus, nitrogen)

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

Source: EPA ATTAINS assessment unit MN70-0069-00 · 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

Lake details from Minnesota DNR LakeFinder

Ice data from Minnesota DNR Climate

Most recent sample: 2023-10-10

Monitoring stations: 2