The following is from Alameda Harbor Bay Ferry Service …
The Alameda/Oakland Ferry will provide direct service between Oakland, Alameda Main Steet, and AT&T Park for the Saturday and Sunday, October 2 and 3, games with San Diego. The ferry schedule for both Saturday and Sunday games is:
a) Departs Oakland at 11:30 AM.
b) Departs Alameda Main Street at 11:50 AM.
c) Arrives AT&T Park at approximately 12:20 PM.
d) After the game ferry departs AT&T Park 20 minutes after last out (but no earlier than 4:00 PM).