RaceAtlas

Alcatraz Island Tides: Thursday, August 20, 2026

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

1.0 ft12:41 AM3.9 ft8:05 AM3.4 ft11:59 AM5.6 ft6:10 PM2 ft4 ft6 ft12 AM6 AM12 PM6 PM12 AM
High 5.6 ft at 6:10 PM, low 1.0 ft at 12:41 AM. Gate: flood 1.9 kt at 5:24 AM, ebb 0.6 kt at 9:58 PM.
Modelled current at the Golden Gate on a 1.9 kt floodThe Gate at max flood, 1.9 kt
Tide height
TimeHeight
12:41 AMLow1.0 ft
8:05 AMHigh3.9 ft
11:59 AMLow3.4 ft
6:10 PMHigh5.6 ft
Current · Golden Gate
TimeStateSpeed
1:16 AMslack–
5:24 AMmax flood ENE (074°)1.9 kt
8:49 AMslack–
10:36 AMmax ebb SW (235°)0.6 kt
12:32 PMslack–
3:38 PMmax flood ENE (074°)1.8 kt
7:39 PMslack–
9:58 PMmax ebb SW (235°)0.6 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.