James W. Marshall discovered gold in 1848 on the South Fork of the American River in the valley the Nisenan Indians knew as Cullumah. This event led to the greatest mass movement of people in the Western Hemisphere and was the spark that ignited the spectacular growth of the West during the ensuing decades. The gold discovery site, located in the still visible tailrace of Sutter's sawmill, in present day Coloma California, is one of the most significant historic sites in the nation.

The purpose of Marshall Gold Discovery State Historic Park is to secure for the people and to make available for their observation, inspiration, and enjoyment, the gold discovery site and its environs as an accurate portrayal of the story that unfolded at the time of the discovery and Gold Rush. The park's interpretive program primarily embraces the period from 1847 through 1852, but also shows the town of Coloma as it developed.

Marshall Gold Discovery State Historic Park is the place where James W. Marshall found shining flecks of gold in the tailrace of the sawmill he was building for himself and John Sutter. This discovery in 1848 changed the course of California's and the nation's history. See a replica of the original sawmill and over 20 historic buildings including mining, house, school, and store exhibits.

Visitors have the opportunity to try panning for gold in the American River and enjoy hikes and picnics under the riparian oak woodlands. Overlooking the beautiful river canyon, where the gold discoverer rests today, see California's first historic monument, the statue of James Marshall pointing at his gold discovery site .