Arvada (/ɑːrˈvædə/) is a Home Rule City located in Jefferson and Adams counties, Colorado, United States.The Olde Town Arvada historic district is 7 miles (11 km) northwest of the Colorado State Capitol in Denver.The first documented discovery of gold in the Rocky Mountain region occurred on June 22, 1850, when Lewis Ralston, a Georgia prospector traveling with a party headed for the California gold fields, dipped his sluice pan into a small stream near its confluence with Clear Creek.The Territory of Colorado was formed on February 28, 1861, and the farms in the valley expanded to feed the growing population of the region.On December 9, 2007, Matthew J. Murray walked into the Youth With a Mission Center in Arvada and, after he was refused his request to stay overnight in the dormitories, opened fire and killed two people, injuring two more.A memorial was held the following Wednesday, December 12, in which Youth With a Mission leaders forgave Murray's family for what happened.The Amtrak California Zephyr passes through Arvada westbound each morning and eastbound each evening and stops at the nearby Denver Union Station.Arvada is served by the Regional Transportation District commuter rail G line and bus routes 28, 32, 51, 52, 72, 76, and 100.[29] Notable individuals who were born or have lived in Arvada include novelist Clive Cussler,[30] baseball pitcher Roy Halladay,[31] Joe King[32] and Isaac Slade[33] of the rock band The Fray, actor Nicholas Alexander Chavez, and professional golfer and U.S. Olympic track and field gold medalist Babe Didrikson Zaharias.