RaceAtlas

Alcatraz Island Tides: Thursday, May 21, 2026

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

5.9 ft3:14 AM-1.1 ft10:22 AM4.8 ft5:52 PM2.9 ft10:49 PM0 ft2 ft4 ft6 ft12 AM6 AM12 PM6 PM12 AM
High 5.9 ft at 3:14 AM, low -1.1 ft at 10:22 AM. Gate: flood 2.8 kt at 2:42 PM, ebb 1.5 kt at 7:42 AM.
Modelled current at the Golden Gate on a 2.8 kt floodThe Gate at max flood, 2.8 kt
Tide height
TimeHeight
3:14 AMHigh5.9 ft
10:22 AMLow-1.1 ft
5:52 PMHigh4.8 ft
10:49 PMLow2.9 ft
Current · Golden Gate
TimeStateSpeed
1:11 AMmax flood ENE (074°)2.6 kt
4:22 AMslack–
7:42 AMmax ebb SW (235°)1.5 kt
11:28 AMslack–
2:42 PMmax flood ENE (074°)2.8 kt
7:02 PMslack–
9:19 PMmax ebb SW (235°)0.8 kt
11:21 PMslack–

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.