![]() Upon its completion, the span became part of the Lincoln Highway. It was the first major crossing of the San Francisco Bay and a significant technological achievement in its time. Prior to this, crossing the Carquinez Strait necessitated the use of ferries. The original steel cantilever bridge was designed by Robinson & Steinman and dedicated on May 21, 1927. ![]() Ferry service at the site of the bridge started in 1913 by the Rodeo-Vallejo Ferry Company. ![]() A train ferry operated between Benicia and Porta Costa from 1879 until 1930 when a rail bridge opened. Auto service started on this route in 1913. The first regular crossing of the Carquinez Strait began in the mid-1800s as a ferry operated between the cities of Benicia and Martinez, six miles upstream from the bridge site. The Alfred Zampa Memorial Bridge carries southbound traffic from Vallejo to Crockett, and the 1958 cantilever span carries northbound traffic. Later, seismic problems made the 1927 span unsafe in case of an earthquake, and led to the construction, and 2003 opening, of a replacement: a suspension bridge officially named the Alfred Zampa Memorial Bridge, in memory of iron worker Al Zampa, who played an integral role in the construction of numerous San Francisco Bay Area bridges. A second parallel cantilever bridge was completed in 1958 to deal with the increased traffic. The name Carquinez Bridge originally referred to a single cantilever bridge built in 1927, which was part of the direct route between San Francisco and Sacramento. They form the part of Interstate 80 between Crockett and Vallejo, California. The Carquinez Bridge is a pair of parallel bridges spanning the Carquinez Strait at the northeastern end of San Francisco Bay.
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