They say that due to "vessel availability" they can't provide direct ferry service to the park.
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Instead, you can ride the ferry to and from the San Francisco Ferry Building, and walk to the ballpark, or go underground and take Muni.
The Giants-Tampa Bay game is due to start on time at 1:35 p.m. despite a rainy morning.
Go here for more information.
ALERT: Due to vessel availability, Golden Gate Ferry is unable to provide direct ferry service to today's @SFGiants home opener at @OracleParkSF. Ride regular ferry service to/from the SF Ferry Bldg instead. It's a short walk to the ballpark. MORE INFO: https://t.co/dmAr8zBLpo pic.twitter.com/RuRX87t07A— Golden Gate Ferry (@GoldenGateFerry) April 5, 2019