McMahon Lake

Details

DNR lake ID

70005000

County

Scott

Surface area

187 acres

Maximum depth

14 feet

Shallow water (littoral) area

158 acres, 85% of the lake

Shoreline

4.3 miles

Average water clarity

5.3 feet (Secchi disk, 3 readings)

Latest DNR fish survey

June 2025, standard survey

Surveys on record

9, since 1978

Game fish caught in the 2025 survey

bluegill 526, black crappie 395, northern pike 148, yellow perch 121, walleye 28, largemouth bass 20, green sunfish 2, hybrid sunfish 1

Fish species recorded

black crappie, bluegill, green sunfish, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, walleye, white crappie, yellow perch, and 5 other species

Stocked in 2025

walleye fingerlings (1,156)

Stocked in 2022

walleye fingerlings (1,875)

Stocked in 2018

walleye fingerlings (1,000)

Stocking years on record

5 of the last 10 (2016 to 2025)

McMahon Lake Public Water Access Site

trailer launch, concrete slab ramp, 1 dock, 9 trailer spaces, toilet, run by DNR Division of Parks and Trails

Infested waters list

Eurasian watermilfoil

Fish consumption

Follow the statewide guidelines; fish from this lake have been tested

Size

100 to 499 acres

Deepest point

Under 15 feet

Public access

Yes

Stocked in the last 3 years

Yes

Sources

• Minnesota DNR LakeFinder
  Checked September 24, 2026
• Minnesota DNR Public Water Access Sites
  Checked September 24, 2026

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.