Placerita Canyon State Park is a California State Park in the San Gabriel Mountains, in an unincorporated rural area of Los Angeles County, north of Los Angeles near Santa Clarita, California.Cultural HistoryThe area of Placerita Canyon was at one time occupied by the Tataviam Native American people and was included in the 1842 Mexican land grant issued for Rancho San Francisco. The park preserves the site of the first documented discovery of gold in California where in 1842, Francisco Lopez found gold flakes on wild onion roots under the "Oak of the Golden Dream".The park is near several movie ranches, all historic and active, including the Monogram Movie Ranch—Melody Ranch and the Disney—Golden Oak Ranch.The "Oak of the Golden Dream" is California Historical Landmark #168.