Alcatraz Island, 0.5 mile north of

Fri 21 Aug 2026

1.0 kn0.7 kn1.0 kn03:4909:5314:0819:41Now
Tidal current at Alcatraz Island, 0.5 mile north of, computed from harmonic constituents. Maximum flood of 1.0 knots on Fri 21 Aug 2026 at 07:12.

Slackwater predicts tides and currents offline, on your phone — tides worldwide, currents across the US and Canada.

Get the beta on TestFlightSlackwater