Putah Creek, c.85 mi/137 km long; rises in the Coast Ranges, SW Lake co., W central Calif., 17 mi/27 km S of Clear L.; flows SE through L. Berryessa (Monticello Dam) and E past Winters and Davis, entering marshy area on W side of Sacramento R. c.10 mi/16 km SW of Sacramento; prevented from entering Sacramento R. by Sacramento Deep Water Canal. Forms part of border bet. Yolo and Solano cos.