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The Rocky Flats National Wildlife Refuge is a 5,237-acre (21.19 km2) National Wildlife Refuge in the United States, located approximately 16 miles (26 km) northwest of Denver, Colorado. The refuge is situated west of the cities of Broomfield and Westminster and north of the city of Arvada. The refuge is home to various animals, including a herd of 150 elk, occasional black bear, mountain lions, and moose; as well as badgers, bats, coyote, two species of owl, mule deer, northern flicker, white pelican, black-tailed prairie dog, and porcupine. The site also contains an estimated 630 plant species. Prior to its establishment in 2007, the area housed a large manufacturing complex that produced nuclear weapons parts from the 1950s through the 1990s, until shutting down in 1992.