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.
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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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.8 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 42 ft |
| Surface Area | 42.87 acres |
| Shoreline Length | 1.3 mi |
| Littoral Zone | 23% |
| Public Access | No |
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.14 m/yr | 5 |
Ice Season
Historical ice data from Minnesota DNR (16 observations).
Estimated open water season: 214 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2012-03-24 (2012) | 2008-04-28 (2008) |
| Ice-In | 2018-11-10 (2018) | 2007-11-29 (2007) |
Most recent ice-out: 2012-03-24
Location
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
More Minnesota Lake Rankings
State Parks Near Boy Lake
Other Grade B Lakes in Minnesota
Mesotrophic Lakes in Minnesota
DNR Fisheries Survey Summary
1 survey on file from MN DNR Fisheries. Most recent: 1983-06-29 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Black Bullhead | 31.75 | 0.17 lb |
| Northern Pike | 5.50 | 1.04 lb |
| Yellow Perch | 3.88 | 0.34 lb |
| Walleye | 0.50 | 1 lb |
| Brown Bullhead | 0.25 | 0.4 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.
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Boy Lake. 2 reports on file.
- —Fisheries Lake Survey — BoyFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Boy (0735)Aquatic Plant Report · MN DNR LakeFinder
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
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