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Child Lake

Cass County, MinnesotaMesotrophic

Child Lake sits at the top of the Minnesota PCA grading rubric with an A, a mark reached by the cleanest lakes in Minnesota. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.

The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. Child Lake reaches 29 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. Child Lake covers 285 acres alongside 4.6 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Among the 132 graded lakes in Cass County, Child Lake sits at rank 61, above the county median.

No invasive species are currently listed at Child Lake — the lake remains off the Minnesota infested-waters roster. Muskie are on the species list at Child Lake, among the lake's 17 documented fish. Public access is available — the lake is on the Minnesota PCA public-access list. The lake has a partial ice record — 5 observed ice-outs, centered near Apr 13. 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 2024-09-22. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Good clarity, visible to about 11.3 ft. Phosphorus level: 14 µg/L. Trophic State Index: 42.

MetricValueGrade
Water Clarity (Secchi Depth)11.3 ftB
Phosphorus14 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)42Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth29 ft
Surface Area285.04 acres
Shoreline Length4.6 mi
Littoral Zone55%
Public AccessYes

Fish Species

black bullhead,black crappie,bluegill,bowfin (dogfish),brown bullhead,hybrid sunfish,largemouth bass,muskellunge,northern pike,pumpkinseed,rock bass,smallmouth bass,tullibee (cisco),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 Child Lake (14-day solunar calendar)

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

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

Water Quality Trend: Stable

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

MetricTrendChange/YearYears
Water Clarity Stable-0.048 m/yr5
Phosphorus Stable+0.15 µg/L/yr5
See year-by-year chart →

Ice Season

Historical ice data from Minnesota DNR (7 observations).

Typical Ice-Out
Apr 13
EarliestLatest
Ice-Out2017-04-02 (2017)2019-04-25 (2019)
Ice-In2018-11-13 (2018)2015-11-30 (2015)

Most recent ice-out: 2019-04-25

Location

Loading map…

County Ranking

Ranked #61 of 132 lakes in Cass County

Nearby Lakes in Cass County

DNR Fisheries Survey Summary

12 surveys on file from MN DNR Fisheries. Most recent: 2024-07-01 (Standard Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
BNS35.75
CNM12.69
Bluntnose Minnow12.35
BCS9.84
Bluegill7.660.21 lb
GOS6.100.06 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

144 fish · 27 in · 2024-07-01
65330234567

GOS

1 fish · 55 in · 2008-07-21
105

From the 2024-07-01 survey

Child Lake (DOW # 11-0263; Lake Class 31) is a 285-acre lake with 158 littoral acres, 4.56 miles of shoreline, and a maximum depth of 29 feet located near Hackensack, MN. There is a primitive, user-developed earthen access on state-owned land on the south shore off Cass County Highway 5. Child Lake is also accessible…

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 Child Lake. 4 reports on file.

EPA Impairment Status

Child 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 MN11-0283-00 · Official waterbody report · Matched by proximity (2.34 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: 2024-09-22

Monitoring stations: 1