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C

Clear Lake

Washington County, MinnesotaEutrophic

Clear Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. With clarity and phosphorus scored, the sub-grades cluster within a letter of each other, pointing to stable conditions rather than one specific stressor.

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. A maximum depth of 28 ft puts Clear Lake in the middle of Minnesota's depth distribution. The lake's 429 acres and 4.3 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Clear Lake sits at rank 20 of 31 in Washington County, in the lower half of the local distribution.

Clear Lake is on the Minnesota infested-waters list for zebra mussels — boaters should follow clean-drain-dry protocols when moving gear to or from the lake. Muskie are on the species list at Clear Lake, among the lake's 14 documented fish. A documented public access point at Clear Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Ice-out has been recorded 11 times at Clear Lake, with a median around Apr 11. 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 2022-09-29. 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 6.2 ft. Phosphorus level: 33 µg/L. Trophic State Index: 53.

MetricValueGrade
Water Clarity (Secchi Depth)6.2 ftD
Phosphorus33 µg/LC
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)53Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Maximum Depth28 ft
Surface Area428.95 acres
Shoreline Length4.3 mi
Littoral Zone62%
Public AccessYes

Fish Species

black bullhead,black crappie,bluegill,bowfin (dogfish),common carp,hybrid sunfish,largemouth bass,northern pike,pumpkinseed,tiger muskellunge,walleye,white sucker,yellow bullhead,yellow perch

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

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

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

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

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 watermilfoilzebra mussel

Water Quality Trend: Improving

Based on 3 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+0.085 m/yr3
Phosphorus Improving-1 µg/L/yr2

Ice Season

Historical ice data from Minnesota DNR (15 observations).

Typical Ice-Out
Apr 11
Typical Ice-In
Nov 23

Estimated open water season: 226 days

EarliestLatest
Ice-Out2016-03-16 (2016)2018-05-01 (2018)
Ice-In2018-11-13 (2018)2017-12-06 (2017)

Most recent ice-out: 2022-04-12

Location

Loading map…

County Ranking

Ranked #20 of 31 lakes in Washington County

Cleaner Lakes Within 30 Miles

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

See full comparison →

Nearby Lakes in Washington County

DNR Fisheries Survey Summary

17 surveys on file from MN DNR Fisheries. Most recent: 2024-06-20 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Spottail Shiner351.14
Bluntnose Minnow154.03
JND31.91
Bluegill26.030.15 lb
Black Bullhead24.140.19 lb
Black Crappie18.840.17 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

10 fish · 37 in · 2024-06-20
53034567

Black Bullhead

9 fish · 711 in · 2024-06-20
4207891011

Black Crappie

13 fish · 49 in · 2024-06-20
530trophy 10456789

From the 2024-06-20 survey

Clear Lake is a eutrophic, class 24 lake located in northern Washington County. The Lake is 424 acres in surface area, with 267 acres being littoral (63%). The lake's maximum depth is 28 feet. Primary management species are Walleye and Hybrid (Tiger) Muskellunge, and the secondary management species is Northern Pike.…

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 Clear Lake. 3 reports on file.

EPA Impairment Status

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

Causes of impairment

Impaired biota (cause unknown)MercuryPFAS

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

Source: EPA ATTAINS assessment unit MN82-0163-00 · 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: 2022-09-29

Monitoring stations: 2