Clam Lake is an unincorporated, census-designated place in the town of Gordon in Ashland County, Wisconsin, United States. It is located on Wisconsin Highway 77 near County Highway GG. The entire area lies within the Chequamegon National Forest, an 860,000-acre area spread across northern Wisconsin. As of the 2020 census, its population was 36, a tiny decrease from 37 in 2010.