After California's wheat output dropped in the early 20th Century and especially after the Southern Pacific ( which took over the operations of the Central Pacific ) constructed a railroad bridge at Martinez in 1930 to replace the ferry crossing, Benicia declined until the economic boom of World War II, which doubled the population to about 7, 000 residents.

After California's wheat output dropped in the early 20th Century and especially, after the Southern Pacific ( which took over the operations of the Central Pacific ) constructed a railroad bridge at Martinez in 1930 to replace the ferry crossing, Port Costa lost population and importance.

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