Mahnomen, Alstead & Arco Lake

Details

DNR lake ID

18044000

County

Crow Wing

Surface area

272 acres

Maximum depth

525 feet

Shallow water (littoral) area

53 acres, 20% of the lake

Shoreline

8.1 miles

Average water clarity

32.3 feet (Secchi disk, 5 readings)

Nearest town (DNR)

Armour Number Two Mine

Latest DNR fish survey

July 2022, standard survey

Surveys on record

4, since 1992

Game fish caught in the 2022 survey

rainbow trout 55, rock bass 28, bluegill 20, yellow perch 19, largemouth bass 16, northern pike 12, black crappie 4, hybrid sunfish 4

Fish species recorded

black crappie, bluegill, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, rainbow trout, rock bass, smallmouth bass, walleye, yellow perch, and 7 other species

Alstead Mine Lake Public Water Access Site

trailer launch, natural ramp, run by DNR Division of Parks and Trails

Mahnomen Lake Public Water Access Site

carry-in, natural ramp, run by DNR Division of Parks and Trails

Infested waters list

zebra mussel

Special regulation, Including Alstead and Arco Mine Pit

Lake Trout: All less than 20" must be immediately released, possession limit one.

Fish consumption

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

Size

100 to 499 acres

Deepest point

60 feet or more

Public access

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.