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LakeQuality
B

Bachelor Lake

Aitkin County, MinnesotaLimited DataOligotrophic

On the LakeGrade scale Bachelor Lake grades a B, with clarity at 14.5 ft and phosphorus readings still being added placing it above the Minnesota median. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

Trophically, Bachelor Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. Bachelor Lake reaches 47 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. Bachelor Lake is small — 54 acres alongside 2.1 miles of shoreline — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Among the 53 graded lakes in Aitkin County, Bachelor Lake sits at rank 16, above the county median.

No invasive species are currently listed at Bachelor Lake — the lake remains off the Minnesota infested-waters roster. Bass fishing is part of the appeal: the species list runs to 11, anchored by largemouth and/or smallmouth bass. The lake lacks a documented public access point, so visitor use is limited. 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 2024-08-13. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Good clarity, visible to about 14.5 ft. Trophic State Index: 39.

MetricValueGrade
Water Clarity (Secchi Depth)14.5 ftB
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)39Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Maximum Depth47 ft
Average Depth12 ft
Surface Area53.56 acres
Shoreline Length2.1 mi
Littoral Zone56%
Public AccessNo

Fish Species

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

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

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

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

Water Quality Trend: Declining

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

MetricTrendChange/YearYears
Water Clarity Declining-0.251 m/yr5

Location

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County Ranking

Ranked #16 of 53 lakes in Aitkin County

Nearby Lakes in Aitkin County

DNR Fisheries Survey Summary

3 surveys on file from MN DNR Fisheries. Most recent: 2001-07-18 (Standard Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Largemouth Bass9.970.91 lb
Bluegill9.150.13 lb
Yellow Perch6.330.11 lb
Pumpkinseed4.640.21 lb
Northern Pike3.882.17 lb
Black Bullhead3.500.53 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.

Largemouth Bass

64 fish · 216 in · 2001-07-18
1260246810121416

Bluegill

146 fish · 18 in · 2001-07-18
4724012345678

Yellow Perch

7 fish · 27 in · 2001-07-18
320234567

Pumpkinseed

62 fish · 38 in · 2001-07-18
28140345678

From the 2001-07-18 survey

Bachelor Lake is a moderately fertile 53 acre lake located in Aitkin County just southwest of the city of Aitkin. The shoreline surrounding the lake has minimal development with most of the shoreline made up of marshland, undeveloped forest or woodland, and grassland. The lake is characterized by a larger, deep basin…

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 Bachelor 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

Most recent sample: 2024-08-13

Monitoring stations: 2