Description
Heads in northern Napa Valley on the southeast slope of Mount Saint Helena in the Mayacmas Mountains, flows southeast to the town of Napa then south through Mare Island Strait to Carquinez Strait at San Pablo Bay. (US-T121)
Solano County · California
Heads in northern Napa Valley on the southeast slope of Mount Saint Helena in the Mayacmas Mountains, flows southeast to the town of Napa then south through Mare Island Strait to Carquinez Strait at San Pablo Bay. (US-T121)