RaceAtlas

Alcatraz Island Tides: Thursday, August 21, 2025

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

-0.7 ft5:13 AM5.1 ft12:14 PM2.6 ft5:01 PM6.5 ft11:00 PM0 ft2 ft4 ft6 ft12 AM6 AM12 PM6 PM12 AM
High 6.5 ft at 11:00 PM, low -0.7 ft at 5:13 AM. Gate: flood 3.2 kt at 9:31 AM, ebb 1.9 kt at 3:59 AM.
Modelled current at the Golden Gate on a 3.2 kt floodThe Gate at max flood, 3.2 kt
Tide height
TimeHeight
5:13 AMLow-0.7 ft
12:14 PMHigh5.1 ft
5:01 PMLow2.6 ft
11:00 PMHigh6.5 ft
Current · Golden Gate
TimeStateSpeed
3:59 AMmax ebb SW (235°)1.9 kt
6:17 AMslack–
9:31 AMmax flood ENE (074°)3.2 kt
1:11 PMslack–
3:57 PMmax ebb SW (235°)1.2 kt
5:56 PMslack–
9:04 PMmax flood ENE (074°)2.7 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.