Big Boy Lake is a 3,452-acre lake located near Boy River, Minnesota that has 26.2 miles of shoreline and a maximum depth of 45 feet. There is a state-owned public access on the southwest shore. The Minnesota Department of Natural Resources (MNDNR) has classified Minnesota lakes into 43 different classes based on physical, chemical, and other characteristics. Big Boy Lake is in Lake Class 25. Lakes in this Class are generally deep, clear and irregularly shaped. Big Boy Lake is primarily managed for Walleye, Northern Pike, and Muskellunge and secondarily for Bluegill, Black Crappie, Largemouth Bass, Yellow Perch, and Tullibee (Cisco).
Walleye are abundant in Big Boy Lake and the 2013 catch rate was above average compared to similar local lakes. The average length was 15 inches and fish up to 28 inches were sampled. The walleye population is supported by excellent natural reproduction; no walleye stocking has occurred since the late 1980's and abundance has been consistently higher since stocking was discontinued. In addition, Northern Pike are abundant and the 2013 catch rate was the historical high for Big Boy Lake. The average length for Northern Pike was 19 inches and fish up to 32 inches long were sampled. There is a small but natural reproducing population of Muskellunge in Big Boy Lake with fish up to 51 inches sampled during 2013. Other fish species that are available for anglers to catch are Black Bullhead, Black Crappie, Bluegill, Bowfin (Dogfish), Brown Bullhead, Burbot, Largemouth Bass, Pumpkinseed Sunfish, Redhorse (Greater and Shorthead), Rock Bass, Tullibee (Cisco), White Sucker, Yellow Bullhead, And Yellow Perch.
People can have significant impacts on lakes and the fish populations they support. Harvest, lakeshore development, removal of shoreline vegetation, and introductions of invasive species can all adversely affect fish populations. Currently the aquatic invasive species (AIS) that have been identified in Big Boy Lake are the rusty crayfish and purple loosestrife. AIS are moved from infested to non-infested waters by anglers, boaters, and lake shore owners and can adversely impact lakes and fish populations. To avoid spreading AIS, lake users are required to remove all aquatic plants or animals from their watercraft and drain all water from their boat before leaving the access. If you suspect an infestation of an invasive species in this lake, save a specimen and report it to a local natural resource office. Additional information on all of these topics can be found on the DNR website (www.dnr.state.mn.us) or by contacting the Walker Area Fisheries office.