Tidal Data

Active Water Level Station Locator
Mostly US, but some international locations are available.

Tides Online
From the National Oceanographic and Atmospheric Administration.  Water level tables from reference stations throughout the US and territories.

Tidal Predictions at US Tidal Reference Stations
This data is used for the Bridge Simulation course at Cal Maritime - specifically, the Mid Atlantic data for Sandy Hook, New Jersey.  

WWW Tide and Current Predictor  
More data used in the Bridge Simulation course at Cal Maritime.