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Granite Works On OCTA’s S.R. 91 Improvement Project By Irwin Rapoport
CEG CORRESPONDENT
Granite Construction expects to complete the first segment of the $779 million, three-part State Route 91 (between State Route 57 and State Route 55) Improvement Project in Orange County in late 2027. The initiative, a partnership between the Orange County Transportation Authority (OCTA) and the California Department of Transportation (Caltrans), is upgrading a 6.6-mi. section of S.R. 91 to improve mobility and reduce weaving and merging between ramps and interchanges. Segment 1 operations began in April 2025. Parsons Corp. designed the segment. “The portion of S.R. 91 experiences congestion and traffic delays during peak travel periods due to local and regional traffic demand exceeding available capacity on the freeway, and demand is expected to increase,” Eric Carpenter, an OCTA spokesperson, told Construction Equipment Guide. “In addition, weaving and short merging distances between successive ramps and the S.R. 57 and S.R. 55 connectors create several bottlenecks along westbound S.R. 91. Without improvements, the increased travel demand will result in increased travel time, delays and insufficient operating conditions along the freeway, ramps and areas of weaving. “SR 91 is a vital link in Orange County’s traffic network and, especially with more vehicles traveling to and from more affordable communities in the adjacent Riverside County, traffic is frequently backed up during weekday rush hours and on weekends,” he added. “This is one of the major corridors that connects major ports and Orange County to the Inland Empire, the location of many commercial warehouses and manufacturing facilities that prompt significant truck traffic.” Taming Traffic A 2020 traffic study projected local and regional traffic demand would increase along the project corridor from approximately 185,500 vehicles per day in 2014 to
The initiative is upgrading a 6.6-mi. section of S.R. 91 to improve mobility and reduce weaving and merging between ramps and interchanges.
approximately 220,000 vehicles per day by 2050. The project dates to 2008, when OCTA initiated a feasibility study to consider alternatives and design options that could improve mobility within the study area. The planning phase began in early 2013, while an environmental study began in January 2015. The design phase started in June 2020 and was completed in June 2024. Local funds, $668 million, cover most of the project’s financing. The state is contributing $92 million, with $19 million coming from federal funding. The overall project includes S.R. 91 as it passes through Anaheim, Orange, Placentia, Fullerton and Yorba Linda. see OCTA page 6
A worker prepares rebar.