Eastern Transportation Corridor

Dokken Engineering was a member of the Silverado Constructors team that was awarded the design/build contract for constructing the 17-mile Eastern Transportation Corridor toll road. For the contract, Dokken Engineering studied 52 bridges and 3 interchanges, as well as providing final design (PS&E) of 24 bridges on this design-build project in Orange County. The Transportation Corridor Agency (TCA), a joint powers toll-road authority in Orange County, administered this privately funded project.

Advance planning studies were initially prepared for 52 separate structures, including investigation of alternative bridge types, construction methods and preliminary cost estimates. Value engineering studies were performed for three individual interchanges to determine the cost impacts of various layouts, including alternative alignment and profile configurations.

Dokken Engineering was responsible for preparing the structure plans & specifications as well as providing construction support for all 24 bridge structures. The work included the design of interchanges, connector structures, grade separation structures, a tunnel, retaining walls and sound walls on the bridges. The structures were designed to satisfy a stringent TCA developed seismic criteria, which included a service level earthquake as well as meeting Caltrans current seismic design criteria. One of the connector structures contains a long outrigger bent, which straddles SR 91. Another bridge used energy absorbing lead-core elastomeric bearings.