Swan Falls Dam is a concrete gravity type hydroelectric dam in the western United States, on the Snake River in southwestern Idaho. At the dam, the river is the border of Ada and Owyhee counties; it is approximately five miles (8 km) east of Murphy, the seat of Owyhee County. Swan Falls Dam and its reservoir lie within the Snake River Birds of Prey National Conservation Area; the dam and power plant were listed in the National Register of Historic Places in 1976. * 1904 * * Swan Falls Dam at sunrise