RaceAtlas

Alcatraz Island Tides: Sunday, September 21, 2025

Tide heights at Alcatraz Island with the flood, ebb and slack schedule at the Golden Gate.

0.5 ft5:53 AM5.5 ft12:31 PM1.2 ft6:17 PM2 ft4 ft6 ft12 AM6 AM12 PM6 PM12 AM
High 5.5 ft at 12:31 PM, low 0.5 ft at 5:53 AM. Gate: flood 3.4 kt at 10:08 AM, ebb 1.7 kt at 5:06 PM.
Modelled current at the Golden Gate on a 3.4 kt floodThe Gate at max flood, 3.4 kt
Tide height
TimeHeight
5:53 AMLow0.5 ft
12:31 PMHigh5.5 ft
6:17 PMLow1.2 ft
Current · Golden Gate
TimeStateSpeed
1:09 AMslack–
4:22 AMmax ebb SW (235°)1.6 kt
6:52 AMslack–
10:08 AMmax flood ENE (074°)3.4 kt
1:43 PMslack–
5:06 PMmax ebb SW (235°)1.7 kt
7:37 PMslack–
10:39 PMmax flood ENE (074°)2.8 kt

Not for navigation. These are harmonic predictions, not live measurements. Tide heights: station 9414792 (Alcatraz Island). Currents: station SFB1203 (San Francisco Bay Entrance, Golden Gate). · RaceAtlas, the SF Bay current atlas.