Benicia-Martinez Bridge - Benicia-Martinez, Calif.
Kiewit completed the Benicia-Martinez Bridge in August 2007. The five-lane, 8,790-foot-long toll bridge carries northbound vehicles across the Carquinez Strait and connects the City of Benicia in Solano County and the City of Martinez in Contra Costa County. The bridge runs parallel to the existing six-lane Benicia-Martinez Bridge and the Union Pacific Railroad Bridge.
The substructure work required construction of 17 piers, of which 12 are water piers. These piers are founded on 99 concrete and steel piles, which are approximately eight feet in diameter and extend nearly 300 feet into the bedrock below. To reduce impacts to the native fish habitat, Kiewit, in conjunction with the California Department of Transportation, developed an air-bubble curtain system to contain the sound waves generated by the pile driving. The bridge's 1,700-ton footings were constructed offsite, floated into place and supported on the piles.
The bridge's segmental superstructure consists of 11 pier tables and 344 concrete segments. The segments were cast-in-place balanced cantilevers using a traveling form system to cast the entire superstructure in 15-foot sections.
The bridge topped Roads & Bridges' Top 10 Bridges list published in November 2006 and is one of the longest span bridges of its type in the U.S.