The Hanford Reach National Monument is a national monument in the U.S. State of Washington. It was created in 2000, mostly from the former security buffer surrounding the Hanford Nuclear Reservation (Hanford Site). The area has been untouched by development or agriculture since 1943. The monument is named after the Hanford Reach, the last non-tidal, free-flowing section of the Columbia River in the United States, and is one of only two National Monuments administered by the U. S. Fish and Wildlife Service. President Bill Clinton established the monument by presidential decree in 2000.