Skanska has signed a $267m contract with the San Gabriel Valley Council of Governments to make improvements to the State Route 57/60 interchange that runs through the City of Diamond Bar and the City of Industry in Southern California.
The purpose of the project is to reduce traffic at the State Route 57/60 interchange, part of the State Route 57/60 confluence. This two-mile stretch of highway is the sixth most congested freeway segment in the country and third most congested in California.
Skanska will: rebuild an overpass bridge at Grand Avenue; reconfigure Grand Avenue eastbound on- and off-ramps; build an eastbound SR-60 elevated bypass; and widen the eastbound SR-60 Diamond Bar Blvd on-ramp.
“The State Route 57/60 Interchange Improvements Project will increase freeway capacity, improve traffic flow, and reduce congestion in one of the most trafficked areas in the San Gabriel Valley,” said Mike Aparicio, executive vice president of Skanska USA Civil’s West Coast operations.
Construction starts in June and is expected to be finished in June 2028.
