Uvas Creek is a 29.5-mile-long mainly southward-flowing stream originating on Loma Prieta peak of the Santa Cruz Mountains, in Santa Clara County, California, United States. The creek descends through Uvas Canyon County Park into Uvas Reservoir near Morgan Hill, and on through Uvas Creek Preserve and Christmas Hill Park in Gilroy. Upon passin…Uvas Creek is a 29.5-mile-long mainly southward-flowing stream originating on Loma Prieta peak of the Santa Cruz Mountains, in Santa Clara County, California, United States. The creek descends through Uvas Canyon County Park into Uvas Reservoir near Morgan Hill, and on through Uvas Creek Preserve and Christmas Hill Park in Gilroy. Upon passing U.S. Highway 101 it is known as Carnadero Creek, shortly before the confluence with the Pajaro River at the Santa Clara County - San Benito County boundary.