January 2022


The project team began the new year by continuing to make steady progress on the Sixth Street Viaduct. This month we saw the continuation of hanger cabling installation, and a major milestone was reached when we completed the final concrete pour on the last of the viaduct’s 20 arches. 

Final pouring

We began installing hangar cables on the Sixth Street Viaduct arches in October of last year, and in just a few months' time, we will have installed over 15,000 feet of steel cables which help to support the bridge. The arches, which range between 30 to 60 feet in height and are about 300 feet in length, are supported by up to 24 cables each that connect the Arch Ribs and the edge girders that support the viaduct.  

Once the cables are secured, they are tensioned using a hydraulic jack. This process is carefully monitored by engineers to gauge their force, which can be up to 250,000 pounds of force! After cabling is complete, the supportive falsework is then removed, allowing the viaduct to be self-supporting. 

The new viaduct is designed to meet rigorous earthquake standards to withstand even the strongest earthquakes. The columns of the viaduct have been fitted with seismic isolation bearings that absorb a majority of the shock during an earthquake. 

The pouring of the final arches on January 18th was a momentous occasion as it marks some of the final steps toward completion of the viaduct later this Summer. More than 65 truckloads of concrete were used to complete the pour of this arch, with each batch injected with liquid nitrogen to cool the mix. This process helps keep the concrete at an ambient temperature and reduce the potential for concrete cracking.

Concrete Mixing

City Engineer, Gary Lee Moore, who is leading the project, toured the construction site last week. Check out a video of his visit on the link below. With the final arches now poured, we will soon be able to remove the falsework and begin embedding the arches for more cable work. We are looking forward to being able to reveal the beautiful arches this summer and display their spectacular LED lights to celebrate many of the holidays and events that LA has to offer. 

You can watch Gary Lee Moore talk about the final pour and the completion of the viaduct here. 

Thank you for being a part of the Sixth Street Viaduct journey!

About the Project

Stay Involved!

The City of Los Angeles Bureau of Engineering is leading the construction of the new, $588 million Sixth Street Viaduct Replacement Project, the largest bridge project in the history of Los Angeles. The completed structure will be a 3,500-foot long viaduct connecting Boyle Heights and the Arts District across the Los Angeles River. The original viaduct was built in 1932, but had significantly deteriorated due to "concrete cancer"; it was demolished in 2016. The new viaduct will have ten pairs of lit arches, bike lanes and wider sidewalks, along with stairway access and bike ramps connecting to 12 acres of recreational and open space under the bridge, including the Len Hill Plaza. The bridge is funded primarily through the Federal Highway Administration, with additional City support. The viaduct will be completed in Summer 2022.

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The Bureau of Engineering is the City's lead agency for the planning, design and construction management of the City's public buildings and its public infrastructure. Engineering is also responsible for managing permitting for all construction that takes place in the public right-of-way, as well as managing the City's state-of-the-art online mapping system, NavigateLA. Engineering is committed to designing and building environmentally-sustainable projects that include extensive community input. Engineering projects and services support the City's goals of creating a prosperous, livable and safe city for all residents and businesses.

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