RaceAtlas

Alcatraz Island Tides: Tuesday, July 21, 2026

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

1.4 ft12:23 AM3.8 ft6:24 AM2.1 ft11:32 AM5.8 ft6:21 PM2 ft4 ft6 ft12 AM6 AM12 PM6 PM12 AM
High 5.8 ft at 6:21 PM, low 1.4 ft at 12:23 AM. Gate: flood 2.5 kt at 3:37 PM, ebb 1.0 kt at 11:33 PM.
Modelled current at the Golden Gate on a 2.5 kt floodThe Gate at max flood, 2.5 kt
Tide height
TimeHeight
12:23 AMLow1.4 ft
6:24 AMHigh3.8 ft
11:32 AMLow2.1 ft
6:21 PMHigh5.8 ft
Current · Golden Gate
TimeStateSpeed
1:04 AMslack–
4:26 AMmax flood ENE (074°)1.9 kt
7:47 AMslack–
9:54 AMmax ebb SW (235°)0.8 kt
12:15 PMslack–
3:37 PMmax flood ENE (074°)2.5 kt
7:39 PMslack–
11:33 PMmax ebb SW (235°)1.0 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.