Grand Avenue Bridge to Close Overnight Nov. 13
Crews will shut the Diamond Bar bridge from 8 p.m. to 8 a.m. as traffic shifts onto its newly completed section.
Updated on Nov. 5, 2026 in Construction
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The Grand Avenue bridge in Diamond Bar, adjacent to the Pomona (60) Freeway, will be closed overnight on November 13 from 8 p.m. until 8 a.m. the following day. All Grand Avenue lanes between Golden Springs Drive and Grand Crossing Parkway will also be closed, along with the eastbound and westbound ramps to and from the 60 Freeway.
Why it matters
The closure is required to safely transition traffic onto the newly completed bridge section while crews demolish and rebuild the remaining half of the structure. Drivers in the area should plan alternate routes for the overnight window.
The overnight closure runs 12 hours, from 8 p.m. to 8 a.m., on a stretch of the State Route 57/60 corridor that carries approximately 350,000 vehicles a day. Officials have not said whether the timeline could be extended if work runs longer than planned.
The players
Caltrans
The California Department of Transportation, the state agency responsible for the State Route 57/60 corridor and its bridges, oversees the Confluence Project.
The details
Crews are demolishing and reconstructing the remaining half of the Grand Avenue bridge while vehicle movement continues. The on-ramp from southbound Grand Avenue to the westbound 60 Freeway will remain closed for the rest of the bridge reconstruction.
Timeline
November 13, 2026, 8 p.m.: overnight closure of the Grand Avenue bridge begins
November 14, 2026, 8 a.m.: bridge closure ends
November 5, 2026: closure announced by officials
Construction Outlook
The closure is a step in the State Route 57/60 Confluence Project, which aims to ease a two-mile stretch ranked the worst truck bottleneck in California and the seventh worst in the nation. Upgrades along this corridor are part of a broader effort to reduce congestion on one of the region's busiest freight routes.
Drivers should plan alternate routes for the overnight closure on November 13 and expect detours between Golden Springs Drive and Grand Crossing Parkway. The southbound Grand Avenue on-ramp to the westbound 60 Freeway will remain closed for the duration of the reconstruction.
The takeaway
Check your route before traveling near the Grand Avenue bridge on the evening of November 13, since the closure runs overnight and the southbound on-ramp to the westbound 60 Freeway stays closed through the project. Planning an alternate path now can prevent delays during the reconstruction.
What happens next
The on-ramp from southbound Grand Avenue to the westbound 60 Freeway will stay closed for the remainder of the bridge reconstruction.
Further reading
Find more coverage of Construction projects shaping the Inland Empire commute.
Source note: This article includes information reported by My News LA.
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