Instead, the central section was built out from the ends of the cantilevered portions. Treacherous currents made such a process dangerous and unpredictable. In one of the many innovations that the bridge's engineers had to develop during construction, the central portion of the cantilevered section (in the middle of the photo) was not raised into place from the water, as was typical at the time. This photograph shows the completed eastern span of the Bay Bridge, looking northeast from Yerba Buena Island. Pier E-3, near Yerba Buena Island, had the distinction of being the deepest bridge pier ever built up to that time, at a depth of 242 feet below water level. These photographs show some of the stages in constructing a series of twenty-two support piers for the eastern span of the bridge.
The final design consisted of two suspension bridges on the San Francisco side of Yerba Buena Island, a tunnel through the island, and a series of truss and cantilever spans on the eastern portion of the bridge between the island and Oakland's shoreline.
Purcell as the project's Chief Engineer, Charles Andrew as Bridge Engineer, and Glenn Woodruff as Engineer of Design. To meet these challenges, the Toll Bridge Authority and the Department of Public Works appointed Charles H. The bridge needed to span more than five miles (four of which are over water) from Oakland to San Francisco, and be able to withstand turbulent tides, strong winds with a high salt content, and potentially devastating earthquakes. The design and construction of the Bay Bridge was one of the great engineering challenges of the twentieth century.
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