I-405 Update

The Magnolia Street bridge over I-405 opened May 22, marking another major milestone for the I-405 Improvement Project, which is now more than halfway finished.

The Magnolia Street bridge is the fifth to open among the 18 being built, widened or replaced as part of the project, but it’s the first to open that was reconstructed one-half at a time. This allowed 405

Magnolia Street, which straddles Huntington Beach, Fountain Valley and Westminster, to remain open to traffic during construction, minimizing impacts to the community.

Four other bridges on the project have also been completed. Slater Avenue in Fountain Valley was the first bridge to open in 2019. Last year, Bushard Street in Fountain Valley and McFadden Avenue, which links Huntington Beach and Westminster, were completed. Last month, Talbert Avenue in Fountain Valley opened.

In addition to the bridge construction, substantial work to improve on- and off-ramps, widen the freeway, and replace soundwalls has been completed. As a result, overall construction on the project that began in early 2018 is approximately 55 percent complete.

Next month, the Warner Avenue bridge in Fountain Valley is expected to fully close to traffic for reconstruction. Demolition of the overcrossing will require overnight closures of I-405 near the bridge. For the latest updates, visit the project’s interactive map at octa.net/405map.