Yulupa Creek is a 2.8-mile-long southeast-flowing perennial stream that rises on the southeastern flanks of the northern Sonoma Mountains in Sonoma County, California, United States. This creek, which drains the eastern slopes of Bennett Mountain, is a tributary to Sonoma Creek, which in turn discharges to San Pablo Bay. Yulupa Avenue in Santa Rosa i…Yulupa Creek is a 2.8-mile-long southeast-flowing perennial stream that rises on the southeastern flanks of the northern Sonoma Mountains in Sonoma County, California, United States. This creek, which drains the eastern slopes of Bennett Mountain, is a tributary to Sonoma Creek, which in turn discharges to San Pablo Bay. Yulupa Avenue in Santa Rosa is presumably named after this creek.