Union Lake

Details

DNR lake ID

21004100

County

Douglas

Surface area

107 acres

Maximum depth

45 feet

Mean depth

14 feet

Shallow water (littoral) area

57 acres, 53% of the lake

Shoreline

1.8 miles

Average water clarity

11.2 feet (Secchi disk, 3 readings)

Latest DNR fish survey

July 2022, standard survey

Surveys on record

10, since 1979

Game fish caught in the 2022 survey

bluegill 240, largemouth bass 90, pumpkinseed 75, hybrid sunfish 39, black crappie 31, northern pike 25, yellow perch 9, walleye 3

Fish species recorded

black crappie, bluegill, green sunfish, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, walleye, yellow perch, and 15 other species

Stocked in 2024

walleye fingerlings (1,140)

Stocked in 2023

walleye fingerlings (660)

Stocked in 2022

walleye fingerlings (1,311)

Stocking years on record

4 of the last 10 (2019 to 2024)

Union Lake Public Water Access Site

trailer launch, concrete slab ramp, 1 dock, 8 trailer spaces, run by DNR Division of Parks and Trails

Infested waters list

zebra mussel

Fish consumption

Follow the statewide guidelines; fish from this lake have not been tested

Size

100 to 499 acres

Deepest point

30 to 59 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.