RaceAtlas

Alcatraz Island Tides: Monday, April 21, 2025

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

3.3 ft12:40 AM4.7 ft5:56 AM-0.1 ft1:13 PM4.4 ft8:49 PM0 ft2 ft4 ft12 AM6 AM12 PM6 PM12 AM
High 4.7 ft at 5:56 AM, low -0.1 ft at 1:13 PM. Gate: flood 2.3 kt at 5:48 PM, ebb 1.1 kt at 10:30 AM.
Modelled current at the Golden Gate on a 2.3 kt floodThe Gate at max flood, 2.3 kt
Tide height
TimeHeight
12:40 AMLow3.3 ft
5:56 AMHigh4.7 ft
1:13 PMLow-0.1 ft
8:49 PMHigh4.4 ft
Current · Golden Gate
TimeStateSpeed
1:02 AMslack–
4:00 AMmax flood ENE (074°)1.7 kt
7:23 AMslack–
10:30 AMmax ebb SW (235°)1.1 kt
1:53 PMslack–
5:48 PMmax flood ENE (074°)2.3 kt
10:22 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.