Karl E. Mundt National Wildlife Refuge protects 1,085 acres along the Missouri River below Fort Randall Dam in southern South Dakota, with a small extension into Nebraska. Part of the Lake Andes National Wildlife Refuge Complex, it is managed by the U.S. Fish and Wildlife Service and is especially important for wintering bald eagles. Open water below the dam, abundant fish, and cottonwood shelter create prime habitat, drawing more than 200 eagles and forming the largest concentration in the lower 48 states. Recognized as a National Natural Landmark in 1967, the habitat gained stronger protection in 1974 and was later named for Senator Karl Mundt, a supporter of endangered species legislation.