Boulder Lake is a 516 acre lake located in Vilas County. It has a maximum depth of 23 feet. Visitors have access to the lake from 2 public boat landings. Fish include muskie, walleye, northern pike, largemouth bass, smallmouth bass and panfish. According to the Wisconsin DNR, walleye are abundant in this lake. Muskie and panfish are considered common in the lake. Northern pike, largemouth bass and smallmouth bass are listed as present.