Eel Lake is large, deep lake in a chain of water bodies along the Oregon Coast south of the Umpqua River in the United States. The chain includes other large lakes—Clear, North Tenmile, and Tenmile—as well as smaller lakes, which drain into the Pacific Ocean via Tenmile Creek.Eel Lake is about 7 miles (11 km) south of Reedsport, east of U.S. Route 101 and north of Lakeside. Steep slopes of the Oregon Coast Range border Eel Lake on the east. William M.