RaceAtlas

Alcatraz Island Tides: Thursday, July 31, 2025

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

3.9 ft5:06 AM2.0 ft10:35 AM5.5 ft5:25 PM2 ft4 ft6 ft12 AM6 AM12 PM6 PM12 AM
High 5.5 ft at 5:25 PM, low 2.0 ft at 10:35 AM. Gate: flood 2.3 kt at 2:44 PM, ebb 0.9 kt at 9:16 PM.
Modelled current at the Golden Gate on a 2.3 kt floodThe Gate at max flood, 2.3 kt
Tide height
TimeHeight
5:06 AMHigh3.9 ft
10:35 AMLow2.0 ft
5:25 PMHigh5.5 ft
Current · Golden Gate
TimeStateSpeed
12:14 AMslack–
3:38 AMmax flood ENE (074°)1.7 kt
7:15 AMslack–
9:12 AMmax ebb SW (235°)0.8 kt
11:29 AMslack–
2:44 PMmax flood ENE (074°)2.3 kt
6:53 PMslack–
9:16 PMmax ebb SW (235°)0.9 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.