When complete, the Sixth Street Viaduct will have 10 pairs of arches, one of the bridge's most remarkable and beautiful features. The arches will be 10 feet wide, with a typical arch span of 300 feet. You will notice that the arches vary in height as well. Over the railroads they will be 60 feet high above the bridge deck; over the 101 Freeway, they will be 40 feet high; and all other arches will be 30 feet high.

The first step to building the arches is to set up temporary steel and wooden falsework on the bridge deck. The falsework supports the permanent arches during construction.

The Y-bents, which will form the base of the permanent arches, have all been completed.

Over the last two months, the falsework for more than a half-dozen arches have been completed, starting at the east end of the project. Arches can be seen near the 101 freeway.

The City of Los Angeles Bureau of Engineering is leading the construction of the new, $488 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. The bridge is funded primarily through the Federal Highway Administration, with additional City support. The viaduct will be completed in 2022.

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