Spanning the Carquinez Strait in the San Francisco Bay area, the Carquinez Bridge is actually three parallel bridges at the same site. The original bridge, built in 1927 had developed seismic problems and in 2003 was replaced with a new suspension bridge, the Alfred Zampa Memorial Bridge, designed to withstand quakes of 8.0 of the Richter scale.
The new suspension bridge is a 1,056 metre long orthotropic steel box girder bridge, featuring two 125 metre high concrete towers and a 25 metre wide deck which has four highway lanes, two shoulders and a bike and pedestrian lane.
The orthotropic girder is supported by vertical suspenders and two 512-milimetre diameter main cables. WIRELOCK® was used to socket the hanger ropes and the main tie down ropes.