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B

Boy Lake

Itasca County, MinnesotaLimited DataMesotrophic

On the LakeGrade scale Boy Lake grades a B, with clarity at 11.8 ft and phosphorus readings still being added placing it above the Minnesota median.

The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. Boy Lake reaches 42 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. The lake is compact at 43 acres, with 1.3 miles of shoreline and little volume to buffer nutrient inputs. Within Itasca County's 141 graded lakes, Boy Lake ranks 79 — below the local median, though not at the bottom.

No invasive species are currently listed at Boy Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Boy Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The lake lacks a documented public access point, so visitor use is limited. The lake has a partial ice record — 5 observed ice-outs, centered near Apr 16. 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 2022-09-07. 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

Good clarity, visible to about 11.8 ft. Trophic State Index: 42.

MetricValueGrade
Water Clarity (Secchi Depth)11.8 ftB
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)42Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth42 ft
Surface Area42.87 acres
Shoreline Length1.3 mi
Littoral Zone23%
Public AccessNo

Water Quality Trend: Declining

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

MetricTrendChange/YearYears
Water Clarity Declining-0.14 m/yr5
See year-by-year chart →

Ice Season

Historical ice data from Minnesota DNR (16 observations).

Typical Ice-Out
Apr 16
Typical Ice-In
Nov 16

Estimated open water season: 214 days

EarliestLatest
Ice-Out2012-03-24 (2012)2008-04-28 (2008)
Ice-In2018-11-10 (2018)2007-11-29 (2007)

Most recent ice-out: 2012-03-24

Location

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County Ranking

Ranked #79 of 141 lakes in Itasca County

Cleaner Lakes Within 30 Miles

Boy Lake holds Grade B. One nearby lake has a higher grade.

Nearby Lakes in Itasca County

DNR Fisheries Survey Summary

1 survey on file from MN DNR Fisheries. Most recent: 1983-06-29 (Standard Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Black Bullhead31.750.17 lb
Northern Pike5.501.04 lb
Yellow Perch3.880.34 lb
Walleye0.501 lb
Brown Bullhead0.250.4 lb

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

From the 1983-06-29 survey

BULLHEAD AND NORTHERN PIKE POPULATIONS ARE AT QUITE HIGH LEVELS. THE FISH SPECIES COMPLEX IS INDICATIVE OF PERIODIC WINTERKILL IN THE 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 Boy Lake. 2 reports on file.

EPA Impairment Status

Boy Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Mercury

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

Source: EPA ATTAINS assessment unit MN31-0624-01 · Official waterbody report · Matched by proximity (1.47 km)

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: 2022-09-07

Monitoring stations: 2