American Canyon will continue looking to the proposed, massive Sites reservoir in Colusa County to someday help slake its thirst. The city of about 20,000 residents is the only Napa County city without a local reservoir. It depends on the state’s North Bay Aqueduct that pumps water out of Barker Slough, a dead-end slough in the Solano County portion of Sacramento-San Joaquin Delta. Supply reliability is tied to the Sierra snowpack that melts and sends water into the state’s Lake Oroville reservoir that feeds into the Delta. From year to year, it’s wait-and-see how much of the American Canyon allocation will actually arrive.