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C

Clearwater Lake

Itasca County, MinnesotaLimited DataMesotrophic

Clearwater Lake sits at a C on the grading scale — not impaired, not pristine, with summer measurements that vary year to year.

A TSI near 45 places Clearwater Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. Clearwater Lake reaches 16 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. Clearwater Lake covers 132 acres alongside 1.9 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Clearwater Lake sits at rank 101 of 141 in Itasca County, in the lower half of the local distribution.

No invasive species are currently listed at Clearwater Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Clearwater Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Clearwater Lake — most use is by shoreline residents and their guests. The lake has a long ice-out record — 57 observations on file, with a median ice-out around Apr 17. 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 2023-09-23. 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

Moderate clarity, visible to about 9.5 ft. Trophic State Index: 45.

MetricValueGrade
Water Clarity (Secchi Depth)9.5 ftC
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)45Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth16 ft
Surface Area131.59 acres
Shoreline Length1.9 mi
Littoral Zone95%
Public AccessNo

Water Quality Trend: Improving

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

MetricTrendChange/YearYears
Water Clarity Improving+0.465 m/yr4
See year-by-year chart →

Ice Season

Historical ice data from Minnesota DNR (76 observations).

Typical Ice-Out
Apr 17
Typical Ice-In
Nov 21

Estimated open water season: 218 days

EarliestLatest
Ice-Out2012-03-22 (2012)2013-05-10 (2013)
Ice-In2017-11-03 (2017)2016-12-06 (2016)

Most recent ice-out: 2024-04-05

Location

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County Ranking

Ranked #101 of 141 lakes in Itasca County

Cleaner Lakes Within 30 Miles

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

Nearby Lakes in Itasca County

DNR Fisheries Survey Summary

1 survey on file from MN DNR Fisheries. Most recent: 1983-07-25 (Standard Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Black Bullhead67.880.21 lb
Yellow Perch15.750.18 lb
Brown Bullhead12.750.28 lb
Northern Pike12.631.21 lb
Pumpkinseed4.130.22 lb
Bowfin0.634.16 lb

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

From the 1983-07-25 survey

VERY HIGH BULLHEAD, NORTHERN PIKE AND PERCH POPULATIONS. FISH SPECIES COMPOSITION IS INDICA- TIVE OF A WINTERKILL LAKE.

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 Clearwater 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

Ice data from Minnesota DNR Climate

Most recent sample: 2023-09-23

Monitoring stations: 1