City of Los Angeles
Following a worldwide competition, the City of Los Angeles selected HNTB to deliver final design and construction support for the Sixth Street Viaduct Replacement project.
HNTB and architect Michael Maltzan collaborated on the project to pay tribute to the original bridge – a backdrop in movies, videos and commercials – which was at risk of failure in the event of an earthquake. Dubbed “The Ribbon of Light,” the design features white concrete arches of varying heights canted at 9 degrees – an industry first. The Sixth Street bridge features a concrete “Y” column that branches into arches using grade 80 rebar instead of grade 60, which is a first for the state of California, and sliding isolation bearings exceed seismic code. Stairways and bike ramps improve connectivity for pedestrians.
The award-winning Sixth Street bridge design honors the original viaduct and with innovative safety, durability and beauty features to connect communities. The project has a 100-year service life, marking the first HNTB design to use the Envision infrastructure rating system for sustainability and resource efficiency.