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 of 37 at 2010.