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on june 14, 2002, these four industrial cranes, valued at approximately $1.25 million each, arrived in san francisco bay from shanghai, china. designed to rapidly hoist 40-foot-long containers from super-sized cargo ships, they had to be transported beneath the oakland bridge to reach their final destination, the port of oakland. the tidal range of san francisco bay when these cranes were transported was 4.1 feet and the bridge had a motion of approximately 6 inches. with light chop on the bay and winds blowing at around 10 mph, there was little room for error. with detailed knowledge of the tidal cycle and skillful piloting of the vessel, the cranes cleared the bottom of the bridge by about 6 feet.

navigating ships through shallow water ports, intracoastal waterways and estuaries requires knowledge of the time and height of the tides as well as the speed and direction of the tidal currents. this was particularly critical to sailing ships because they had to take advantage of the tides and currents to maneuver correctly. knowledge of tides and currents is still critical because today’s vessels are much larger than the old sailing ships. the depths and widths of the channels in which they sail, and the increased marine traffic leaves very little room for error. real-time water level, water current, and weather measurement systems now are being used in many major ports to provide mariners and port operators with the latest condition

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