Los Angeles Engineering Bureau Celebrates the Opening of the HNTB-Designed Sixth Street Viaduct Replacement Project

Sixth Street Viaduct Replacement Project Designed by HNTB Celebrates Opening

We would like to congratulate the Los Angeles Bureau of Engineering and all Angelenos on the completion of this transformative bridge that pays homage to the original iconic structure and looks boldly into the future and seamlessly connects downtown- city ​​of Los Angeles and the east side.

The City of Los Angeles Office of Engineering officially opened the new Sixth Street Viaduct Replacement Project in Downtown Los Angeles with several celebrations. It is the largest bridge project in Los Angeles history and replaces the original seismically deficient structure that was built in 1932.

The new bridge, dubbed “The Ribbon of Light”, was created by HNTB Corp in collaboration with Los Angeles architect Michael Maltzan Associates and Danish bridge architect Dissing+Weitling. The design was selected by the Bureau of Engineering through an international design competition. Construction was led by contractors Skanska and Stacy and Witbeck, a joint venture.

Serving as both architect and reference engineer for the decade-long project, HNTB was responsible for the design of the 3,500-foot-long viaduct, connecting historic Boyle Heights to the downtown arts district. town. The original bridge has often been used in countless films, music videos and TV commercials, including car chases on the river bed.

“After so many years of work and anticipation, it was a great feeling last year to see the viaduct as the formwork and hangers were finally stripped away to reveal the actual concrete structure,” said Michael H Jones, PE, SE, HNTB Project Manager, Associate Engineer and HNTB Fellow. “It was truly gratifying to see that the completed structure exceeded our expectations of providing a supremely elegant, well-proportioned and iconic overpass that all Angelenos can be proud of as it connects our communities and improves mobility for all.”

“Los Angeles has invested in world-class infrastructure for now and for the future,” said Yoga Chandran, head of HNTB’s Los Angeles office, who was involved as a program manager during the environmental phase of the project and in securing funding for the bridge program. “The new Sixth Street Bridge will be on the center stage of the world as the Summer Olympics return to Los Angeles in 2028.”

The replacement viaduct pays homage to the original bridge with innovative safety, durability and architectural features recognized for design excellence. Highlights of HNTB engineering design features include:

  • Columns and abutments fitted with triple pendulum friction bearings allow 30 inches of swing in any lateral direction, capable of withstanding a 9.0 magnitude seismic event.
  • The substructure features concrete “Y-Bents” that fit seamlessly into the arches and use grade 80 rebar instead of 60, which is a first for a California bridge.
  • A lifespan of 100 years, making it the first HNTB design to use the Envision infrastructure rating system for sustainability and resource efficiency.
  • The pilings of the viaduct extend up to 165 feet underground, which is equivalent to a 16-story building.
  • An additional 40 feet have been added, widening the span to 100 feet to allow for safe multimodal transportation using dedicated lanes for pedestrians, bicycles as well as vehicle transit.

“We congratulate the Los Angeles Bureau of Engineering and all Angelenos on the completion of this transformative bridge that pays homage to the original iconic structure and looks boldly into the future,” said Wayne Feuerborn, President of HNTB West Division. “Downtown Los Angeles and the East Side are seamlessly connected by the new overpass which also serves as a destination with pedestrian accessibility, multimodal and community gathering features.”

To celebrate the opening, the City of Los Angeles held community celebrations on Saturday July 9 and Sunday July 10. The press event was held on Friday July 8 for members of the media.

“I am proud to have been involved in this project from the beginning and excited to witness the completion of the Sixth Street Viaduct,” said Yung-Nien Wang, PE, HNTB’s Director of Structures. “The collaborative efforts of the City of LA, Bureau of Engineering, designers, engineers and contractors, with the support of Angelenos, have resulted in a ‘Bridge to Future Opportunity’ as we continue to connect our communities together.”

HNTB’s many signature bridge projects in the region include the recently opened 2,000-foot-long Gerald Desmond Bridge in Long Beach, the state’s first cable-stayed vehicular bridge and one of the widest cable-stayed bridges in the world ; the I-405 Sepulveda Pass widening design-build project in Los Angeles, replacing and widening 23 bridges, including replacing the Mulholland Bridge with a 300-foot-long main span structure over the freeway the busiest in the United States; and LA Metro’s Crenshaw Light Rail project, a design-build contract that integrates Los Angeles International Airport into the regional rail network, among others.

Since its founding, HNTB has been nationally recognized for its bridge expertise. The company has roots in Southern California dating back to 1914 with the landmark design of Pasadena’s historic Arroyo Seco Bridge. Spanning 1,486 feet and notable for its Beaux Arts arches, lampposts and distinctive balustrades, the bridge is listed on the National Register of Historic Places and has been designated a National Historic Civil Engineering Landmark by the American Society of Civil Engineers.

About HNTB

HNTB Corporation is an employee-owned infrastructure solutions company serving public and private property owners and building contractors. With 108 years of service, HNTB understands the infrastructure lifecycle and solves customers’ most complex technical, financial and operational challenges. Professionals across the country provide a full range of infrastructure services, including award-winning planning, design, and program and construction management. For more information, visit http://www.hntb.comor follow HNTB on LinkedIn, Twitter, Facebook Where instagram.

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