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Grand Avenue Interchange Ramp Closures

Diamond Bar, CA – November 8, 2017) As part of the ongoing construction of the 57/60 Interchange Improvement project, multiple roadway and ramp closures along Grand Avenue are scheduled to take place beginning on November 14 and continue through February 2018.

Starting Tuesday, November 14 AND Wednesday, November 15 from 12:00 a.m. (Midnight) to 3:00 a.m. (Overnight Full WB SR-60 Closure)

  • Full closure of westbound SR-60 (Pomona) between Diamond Bar Boulevard and Brea Canyon Road for the installation of overhead signage.

Starting Friday, November 17 at 10:00 p.m. to Monday, November 20 at 5:00 a.m. (55-hour Grand Avenue Closure)*southbound SR-57 (Orange) Temple Avenue off-ramp and one lane of Sunset Crossing off-ramp will also be closed.

  • Full closure of Grand Avenue (north and southbound lanes) between Baker Parkway (Industry) and the SR-60 (Pomona) eastbound on- and off-ramps, westbound on- and off-ramps at Grand Avenue, and Old Brea Canyon Road to complete pavement work and construction of the new westbound on-ramp.

Note: Southbound Grand Avenue traffic will be detoured to Baker Parkway to Brea Canyon Road and motorists exiting eastbound Grand Avenue –off-ramp will be restricted to right turns only onto southbound Grand Avenue toward Golden Springs Drive.

Starting November 18 through February 2018/approximately 3.5 months (Long-term Grand Avenue On-Ramp Closure)

  • Full long-term closure of westbound SR-60 (Pomona) on-ramp and right-turn only restrictions for westbound off-ramp at Grand Avenue for the construction of new westbound on-ramp.

Note: Traffic exiting westbound Grand Avenue off-ramp will be restricted to right turns only onto northbound Grand Avenue towards Industry/Walnut. Traffic will NOT be permitted to make a left turn to travel towards Diamond Bar/Chino Hills.

Motorists are encouraged to plan ahead. For real time freeway traffic information, please visit the Caltrans Quickmap:

For project information, contact the City's Public Works Department at 909.839.7040 or email  or visit project page at  for additional information.

About the project - 57/60 Confluence at Grand Avenue Project – The three phase project is designed to improve traffic operation on Grand Avenue from Golden Springs Drive to the interchange at SR-60 (Pomona), increase capacity at the Grand Avenue Interchange, improve traffic operation on the freeway mainline, reduce traffic weaving and increase weaving distance and improve safety.