The Sixth Street Viaduct (Bridge No. 53C-1880) and Sixth Street Overcrossing (Bridge No. 53‑0595) comprised of a single structure that spanned a portion of the Hollywood Freeway (US 101), the Los Angeles River, city streets, and several railroad tracks. The structure is located in a highly urbanized area just east of Downtown Los Angeles and connected Downtown Los Angeles on the west side of the river with the Boyle Heights community on the east side of the river. The 66-foot-wide viaduct (from outside edge to outside edge) was approximately 3,500 feet long, with a 46‑foot-wide (curb-to-curb) four-lane roadway having an 11-foot-wide interior and 12-foot-wide exterior traffic lanes, no shoulders, and variable-width sidewalks extending along both sides. An approximate 3,264-foot-long segment of the viaduct was owned by the City, and the 235-foot-long portion crossing US 101 was owned by Caltrans.
PacRim is part of the HNTB team in the structural design of the River Gateway Structure under the main 6th Street Viaduct.
PacRim was selected to revise the previous traffic study that was prepared for the Draft EIR/EIS and update the report by utilizing current traffic counts. The initial task required the acquisition of traffic counts from data available from the Los Angeles Department of Transportation (LADOT) and manual counts at key locations. PacRim prepared a technical memo comparing the current traffic counts to the projected traffic as stated in the previously prepared report. The Final EIR/EIS for the project was then reviewed and updated to reflect the new traffic counts.