Walleye lake, Northern pike lake, Crappie lake, Sunfish lake

Boulder Lake

Lake-specific eating advicePublic access

Boulder Lake is a 3,260-acre lake in St. Louis County, 18 feet at its deepest. The DNR last surveyed its fish in 2025. Recorded species include walleye, northern pike and crappie.

Details

DNR lake ID
69037300
County
St. Louis
Surface area
3,260 acres
Maximum depth
18 feet
Mean depth
8 feet
Shallow water (littoral) area
3,207 acres, 98% of the lake
Shoreline
35.1 miles
Average water clarity
5.5 feet (Secchi disk, 4 readings)
Nearest town (DNR)
Duluth
Latest DNR fish survey
October 2025, targeted survey
Surveys on record
16, since 1988
Game fish caught in the 2025 survey
walleye 457
Fish species recorded
black crappie, bluegill, northern pike, pumpkinseed, rock bass, walleye, yellow perch, and 6 other species
Boulder Lake Public Water Access Site
trailer launch, concrete slab ramp, 15 trailer spaces, toilet, run by Minnesota Power
Eating advice, general populations
bullhead: all sizes - 1 serving/week
Size
2,000 acres or more
Deepest point
15 to 29 feet
Public access
Yes
Lake-specific eating advice
Yes

Sources

Survey catches show what DNR nets and electrofishing found on the survey date, not how the fishing is today. Check the current regulations and the Department of Health advice before you keep fish, and confirm access conditions before you tow a boat.

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