Fourmile Lake is a reservoir located 5,748 feet (1,752 m) above sea level in Klamath County, Oregon, United States. It is 45 miles (72 km) northeast of Medford. The lake was created when the 25-foot (7.6 m) tall Fourmile Lake Dam was constructed, impounding Fourmile Creek, in the Klamath River watershed. It is located just to the east of Mount McLoughlin, which stands 9,495 feet (2,894 m) above sea level. The lake is bordered by Sky Lakes Wilderness, and is in the Winema National Forest.