Located near the site of Colbert's Ferry, Denison Dam was completed in 1944 as America's largest rolled, earth-filled dam. By impounding the Red and Washita Rivers, it created Lake Texoma. The dam generates hydroelectric power, provides downstream flood control, and creates recreational opportunities. One of the best fishing lakes in the nation, Texoma also features the Tishomingo National Wildlife Refuge, numerous resorts and marinas, and the University of Oklahoma Biological Station, established in 1949 as the first university-affiliated research facility on a manmade lake.