RaceAtlas

Alcatraz Island Tides: Tuesday, October 21, 2025

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

4.8 ft12:31 AM1.9 ft5:45 AM5.8 ft12:01 PM0.1 ft6:33 PM0 ft2 ft4 ft6 ft12 AM6 AM12 PM6 PM12 AM
High 5.8 ft at 12:01 PM, low 0.1 ft at 6:33 PM. Gate: flood 2.9 kt at 11:11 PM, ebb 1.6 kt at 4:20 PM.
Modelled current at the Golden Gate on a 2.9 kt floodThe Gate at max flood, 2.9 kt
Tide height
TimeHeight
12:31 AMHigh4.8 ft
5:45 AMLow1.9 ft
12:01 PMHigh5.8 ft
6:33 PMLow0.1 ft
Current · Golden Gate
TimeStateSpeed
1:56 AMslack–
4:21 AMmax ebb SW (235°)1.2 kt
6:46 AMslack–
9:55 AMmax flood ENE (074°)2.8 kt
1:18 PMslack–
4:20 PMmax ebb SW (235°)1.6 kt
7:51 PMslack–
11:11 PMmax flood ENE (074°)2.9 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.