RaceAtlas

Alcatraz Island Tides: Tuesday, August 18, 2026

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

4.2 ft4:46 AM2.3 ft9:57 AM5.7 ft4:34 PM1.1 ft11:32 PM2 ft4 ft6 ft12 AM6 AM12 PM6 PM12 AM
High 5.7 ft at 4:34 PM, low 1.1 ft at 11:32 PM. Gate: flood 2.6 kt at 2:07 PM, ebb 1.0 kt at 8:32 AM.
Modelled current at the Golden Gate on a 2.6 kt floodThe Gate at max flood, 2.6 kt
Tide height
TimeHeight
4:46 AMHigh4.2 ft
9:57 AMLow2.3 ft
4:34 PMHigh5.7 ft
11:32 PMLow1.1 ft
Current · Golden Gate
TimeStateSpeed
2:42 AMmax flood ENE (074°)2.2 kt
6:21 AMslack–
8:32 AMmax ebb SW (235°)1.0 kt
10:59 AMslack–
2:07 PMmax flood ENE (074°)2.6 kt
5:57 PMslack–
8:26 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.