The 6th Street Viaduct (Bridge No. 53C-1880) and 6th Street Overcrossing (Bridge No. 53‑0595) comprise of a single structure that spans 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 connects 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 (ft)-wide viaduct (from outside edge to outside edge) is approximately 3,500 ft long, with a 46‑ft-wide (curb-to-curb) four-lane roadway having 11-ft-wide interior and 12-ft-wide exterior traffic lanes, no shoulders, and variable-width sidewalks extending along both sides. An approximate 3,264-ft-long segment of the viaduct is owned by the City, and the 235-ft-long portion overcrossing US 101 is owned by Caltrans.
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 acquisition of traffic counts from data available from the Los Angeles Department of Transportation (LADOT) and from 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.