Trancas Bridge

This project is to replace the bridge over Trancas Creek on the Pacific Coast Highway in Malibu, CA, directly adjacent to the world famous Zuma Beach. The existing bridge was nearly 100 years old, and it's channel size would not meet the water flow requirements of a 100-year storm. The bridge is being demolished and replaced in two stages, with half of the bridge being replaced in each stage. The construction is limited to seasonal activity due to the active creek channel flowing underneath it. This means work can only take place between May and November each year. 

Before construction, the span underneath the bridge was 80 feet, and after construction is completed it will be increased to 240 feet. It will also be almost 20 feet wider, allowing easier traffic flow and a protected pedestrian sidewalk to be placed along the iconic PCH. The substructure is composed of Cast-in-Steel-Shel Pilling supporting cast-in-place columns, pier caps, and abutments. The superstructure will consist of 100 precast, prestressed voided slabs, on top of which a cast-in-place deck will be placed. Channel restorations will be performed with native planting at. the end of Stage 2, restoring the natural beauty of the channel and providing a walkway for public beach access underneath the PCH.