The Sixth Street Viaduct was constructed in 1932 using then state-of-the-art concrete technology and an onsite mixing plant. However, just 20 years after the Sixth Street Viaduct was constructed the concrete began to disintegrate due to a chemical reaction known as Alkali Silica Reaction (ASR), causing significant deterioration of the structure.
Over the years, various costly restorative methods have been tried, but none have worked to correct the problem. The results of seismic vulnerability studies, completed in 2004, concluded that the viaduct, in its current state of material deterioration and lack of structural strength, has a high vulnerability to failure in the event of a major earthquake. In addition, the Sixth Street Viaduct has geometric design and safety deficiencies and is in need of replacement. The Bureau of Engineering is working in partnership with FHWA and Caltrans to design and construct a new viaduct.
The project website contains the latest information on what is happening with the project:
For regular email updates on the project and upcoming community meetings, please sign up on the website.
There are also social media sites for the project, including Facebook, Twitter, and Instagram pages:
Facebook: 6th Street Viaduct Replacement Project
The project team continues to seek input from local residents, businesses, community leaders and service organizations in the project area and is working to keep the community as informed as possible on the project, construction impacts and any traffic rerouting as it happens. The project team has also reached out to the broader City of Los Angeles community through the project website and social media pages, and through the local media. The project team has distributed information by email blasts, website and social media updates, door-to-door noticing, and by distributing flyers and posters to over 100 businesses and organizations near the project area.
How will the public be notified of the construction activities, viaduct closure, road closures, and alternate routes?
The public will be notified of all project activities through website and social media updates and through e-blasts to the email list. Please sign up for the project email list at:
Construction notices will be emailed and may be hand-delivered to those communities immediately surrounding the relevant construction area.
In case of emergency, please call 911.
For GENERAL INFORMATION, please contact the Project Information Line at 213-400-8398.
For MEDIA INQUIRIES, please contact 213-485-5085.
For information on JOBS, please contact Veronica Diaz, Skanska Stacy and Witbeck at 213-810-6100.
There may be construction contracting or other vendor opportunities on this project. If you are interested, please submit a message to the project team at:
The project’s funding guidelines allow for reimbursement of relocation expenses accrued by businesses and tenants of buildings in the immediate vicinity of the project. These are properties that are being acquired as a result of project real estate needs, as indicated in the Final Environmental Impact Report/Final Environmental Impact Statement (FEIR/FEIS).
There is no funding to directly assist local businesses impacted by the project. However, the general contractor will notify local residents, property owners, business owners and interested stakeholders in the area of construction activities. The general contractor will work closely with businesses impacted by street closures and traffic congestion to ensure that they can develop alternative routes for their business operations. The project team will provide website and social media announcements to let the public know that businesses are open during construction activities.
What are the intersection improvements that are occurring in conjunction with the Sixth Street Viaduct Replacement Project?
The intersection improvements are a permanent investment in increased multi-modal mobility for the area and are part of the City of Los Angeles’ commitment to reduce traffic. There will be 12 offsite intersection improvements that will accommodate and alleviate traffic loads once the viaduct is closed and detour routes are in use. The project will add permanent traffic signals, left turn phasing, roadway striping, and signage along the detour routes to help move vehicle traffic in the project area. In addition, the project will install new audible pedestrian signals, sidewalk improvements, street lighting, crosswalk striping, and Americans with Disabilities Act (ADA)-compliant ramps to assist pedestrian mobility and safety.
A map of the intersection improvements can be viewed here:
What will be the main alternate routes for getting over the river once the Sixth Street Viaduct is closed?
When the Sixth Street Viaduct is closed, 7th Street and 4th Street will be the primary alternate routes. It is anticipated that 7th Street will be utilized more than 4th Street because it has a greater traffic capacity. Outbound traffic exiting downtown will be encouraged to use Alameda Street or Central Avenue to reach 7th Street. Once across the river, traffic will be directed to Boyle Avenue and then back onto Whittier Boulevard. It is also anticipated that public transportation routes will be used as an alternative to driving, including the use of the Metro bus and rail lines.
A map of the detour routes can be viewed here:
There may be road closures immediately around the construction site for specific construction activities. The project will involve removing demolished viaduct materials from the site and bringing in materials for the new viaduct, including concrete. These activities may produce noise and dust in the immediate area around the construction. The construction traffic may also increase the general traffic congestion around the project area. All mitigation measures included in the approved Environmental Impact Report/Environmental Impact Statement will be incorporated and monitored for compliance.
The general contractor will do everything to the best of its ability to monitor and limit any impacts on the local residents, tenants, and property owners around the project area, including the installation of noise monitoring equipment. The general contractor will notify local residents, property owners, business owners, and interested stakeholders in the area of construction activities. The general contractor will continue to work closely with businesses impacted by street closures and traffic congestion to ensure that they can develop alternative routes for their business operations. The project team will make announcements on the project website and social media pages to let the public know that businesses are open during construction activities.
How will the investment in the Sixth Street Viaduct improve goods movement from the local area? How will it improve mobility in the area?
The new viaduct design removes the “kink” that exists in the existing viaduct. Fixing this geometric deficiency will provide increased safety and better goods movement on the viaduct. The intersection improvements will provide new turn lanes, signaling, and striping around the viaduct, which will assist the movement of large trucks in the area.
The new viaduct will improve bicycle and pedestrian transportation with wider sidewalks, dedicated bicycle lanes, and dedicated pedestrian and bicycle ramps on either side of the viaduct. The Los Angeles County Metropolitan Transportation Authority (Metro) has proposed a new rail station at Sixth Street just near the new viaduct, which would dramatically increase public transportation connectivity to the viaduct and the surrounding areas.
How many jobs will be created? How many jobs will be permanent jobs and how many will be temporary jobs?
The project will create hundreds of jobs. A significant number of these jobs will be construction jobs, which are temporary in nature. These jobs will last for varying amounts of time, depending on the specific trade.
How many internships are being provided to the local youth? How are the internships managed, and will more internships be developed?
In the summers of 2013 and 2014, HNTB, the design firm for the project, brought on recent Bishop Mora Salesian High School graduates (2 graduates per summer) for a 6-week Summer Internship Program. They had the opportunity to interact with elected city officials, the City Engineer, Bureau of Engineering staff, the community outreach team, the Cultural Affairs Commission, public utility executives, client partners and other stakeholders. The City is continuing to look into internship opportunities on the project.
In addition, local students from College Track, Franklin, Mendez, Oscar de la Hoya, Roosevelt, and STEM Academy high schools joined the architectural team from Michael Maltzan Architects to complete the 65-foot long model of the new Sixth Street Viaduct for the project groundbreaking event.
This project is primarily funded with federal transportation funds. At the time this project received funding, the federal government did not allow local hiring preferences.
However, the City’s Bureau of Contract Administration and City Attorney’s office were key in securing a Project Labor Agreement (PLA) for the project, to ensure labor union participation in creating the Sixth Street Viaduct.
The Sixth Street Viaduct team held a public briefing at Puente Learning Center in Boyle Heights on October 6, 2014, which presented the PLA, opportunities for apprenticeship training at Los Angeles Trade Technical College, and goals to include local businesses and local labor participation.
Although there is no official local hiring requirement for this project, Mayor Garcetti, Councilman Huizar, Bureau of Engineering and the Sixth Street Viaduct Construction Manager/General Contractor Skanska Stacy and Witbeck (SSW) are committed to seeking every opportunity to include local participation in this project.
If you are interested in opportunities to work on the Sixth Street Viaduct, please contact:
Veronica Manzo Diaz
Skanska Stacy and Witbeck
585 S. Santa Fe Ave
Los Angeles, CA 90013
Telephone #: 213-810-6100
A book and a video documentary are being developed. They will focus on the history of the Sixth Street Viaduct as well as the other historic bridges along the Los Angeles River.
Will local artists be highlighted, hired, etc? What public art is being planned on each side of the bridge and why? How was this decided?
In June 2014, the City of Los Angeles Department of Cultural Affairs (DCA) selected local artist Glenn Kaino to design the public art component of the viaduct. Chosen from a strong group of local and international candidates, Glenn Kaino works in a range of media, including sculpture, installation, video and performance. Kaino’s grandparents and great-grandparents were long-time residents of Boyle Heights, and he spent more than 15 years living in the Arts District. During his presentation to the Artist Selection Committee, Kaino emphasized the need to engage local communities and honor the viaduct’s significance as an iconic crossing that connects the Downtown Arts District and Boyle Heights.
Councilmember Huizar earlier worked with DCA to establish a Public Art Advisory Committee (PAAC) to assist with the development of a vision for the Viaduct’s public art component. Honoring the PAAC’s vision as a framework, an Artist Selection Committee comprised of local arts experts identified a list of candidates to work on the bridge’s art component. Kaino was then selected by the Committee from a group of top five finalists.
The project team continues to coordinate the design and construction with the US Army Corps of Engineers as the project moves forward. The plans for the project also include bringing more natural light to the tunnel that leads to the Los Angeles River. This will allow for safer pedestrian and bicycle access to the river, and to the Los Angeles River bicycle path if it is extended through the downtown area as has been proposed by the City Council.
The new viaduct will improve bicycle and pedestrian transportation with wider sidewalks, dedicated bicycle lanes, and dedicated pedestrian and bicycle ramps on both sides of the viaduct.
Stairs and access ramps down to the public spaces under the viaduct will be constructed on both sides of the viaduct.
The City is pursuing grant opportunities and possible collaborations with local community organizations to provide programming for the viaduct and its open spaces.
In order to film within the area pictured below, all requests should be directed to FilmLA:
FilmLA Main Phone: 213-977-8600
For any other project related questions, please contact the project hotline at: 213.400.8398