Holter Lake Map by Kingfisher Fishing Maps

Holter Lake is located between Helena and Great Falls off Interstate 15. It is a reservoir that is part of the Missouri River system. It covers 4800 acres and has a maximum depth of 125 feet at the dam. Primary fish species include walleye, rainbow trout, perch, and kokanee salmon. Secondary species include brown trout, mountain whitefish, and burbot.