SR-57 / SR-60 Interchange Improvement Project
New eastbound SR-60 bypass bridge over Prospectors Road to be used as a new lane on eastbound SR-60.
New Grand Avenue bridge with reconfigured on- and -off-ramps.
New eastbound SR-60 Grand Avenue bypass bridge exclusively for eastbound Sr-60 commuters exiting Grand Avenue.
New eastbound SR-60 bypass bridge over Diamond Bar Boulevard to be used as a bypass for eastbound SR-60 commuters.
Project components of Phase III of the 57 (Orange) / SR-60 (Pomona) Interchange Improvement Project - graphic courtesy of San Gabriel Valley Council of Governments (SGVCOG)
NIGHTTIME LANE CLOSURES ON SR-60; SR-57/SR-60 CONNECTOR WILL ALSO EXPERIENCE SOME CLOSURES ALONG WITH
EB SR-60 DIAMOND BAR BLVD. AND GRAND AVE. RAMPS. GOLDEN SPRINGS DRIVE WILL BE CLOSED AT GATEWAY CENTER DRIVE.
Golden Springs Drive will be closed to traffic at Gateway Center Drive. Lanes on SR-57 and SR-60 near the 57/60 may experience intermittent closures throughout night starting on Monday, September 18, 2023 at 7 p.m. until Saturday, September 23, 2023 at 6 a.m. The SR-60 and SR-57 will remain open during lane closures. The EVENING ramp and connector closure schedule is below:
- Golden Springs Drive closure at Gateway Center Drive: September 22 (7 p.m. – 6 a.m.)
- EB SR-60 Connector to NB SR-57 Closure: September 22 (12 a.m. – 6 a.m.)
- EB SR-60 Diamond Bar Boulevard On-Ramp Closure: September 22 (9 p.m. – 6 a.m.)
Construction Notice for September 25-30 - revised 9/22/23 @6 p.m.
Nighttime Lane Closures on SR-60; SR-57/SR-60 Connector Will Also Experience Some Closures Along with EB SR-60 Grand Avenue Ramps. Golden Springs Drive will be closed at Copley Drive.
Golden Springs Drive will be closed to traffic near Copley Drive. Lanes on SR-57 and SR-60 near the 57/60 may experience intermittent closures throughout night starting on Monday, September 25, 2023 at 7 p.m. until Saturday, September 30, 2023 at 6 a.m. The SR-60 and SR-57 will remain open during lane closures.
The EVENING ramp and connector closure schedule is below:
- Golden Springs Drive closure at Gateway Center Drive: September 25, 26, 27, 28, 29 (7 p.m. – 6 a.m.) Time corrected from 7 a.m. to 6 a.m.
- EB SR-60 Connector to NB SR-57 Closure: September 27, 28, 29 (11 p.m. – 5 a.m.)
- EB SR-60 Grand Avenue On-Ramp Closure: September 27, 28, 29 (9 p.m. – 6 a.m.)
- EB SR-60 Grand Avenue Off-Ramp Closure: September 27, 28, 29 (7 p.m. – 6 a.m.)
Phase III of construction, depicted in the graphic above, started in July 2023 and is scheduled for completion in July 2028.
August 2022 - July 2028
Project partners include:
Metro, Caltrans, SGVCOG, City of Industry, and the City of Diamond Bar.
Total Project Cost
Funding sources include:
$22 million of SB 1 Trade Corridors Enhancement Program (TCEP), $205 million Metro Measure M (FY 2024-2025) and $217.9 million CTC 2020 Trade Corridor Enhancement Program funded by SB1.
Watch a drive-through simulation of how traffic will move through the confluence area after the project is completed. Video created by SGVCOG based on the approved design and engineering plans - https://youtu.be/J4F3x99mGIs.
The SR 57/60 Confluence is part of the National Highway Freight Network and is on a federally designated Trade Corridor of National and Regional Significance. The City of Diamond Bar sits right at the crossroads of one of the most heavily travelled and crucial interchange in the nation. Both the SR-57 (Orange) and SR-60 (Pomona) are major travel routes that are critical to Southern California’s regional traffic flow and serve as important links in the movement of goods from coastal ports to inland counties and other states. SR-57 is one of few north-south freeways in the region, serving as a key link between Orange County and East Los Angeles County. In contrast, SR-60 is an essential east-west corridor connecting employees and freight between Los Angeles County and the most populous parts of the Inland Empire. It is also one of the most highly utilized truck routes moving 43% of freight goods in-and-out of the Greater Los Angeles Basin.
The need and travel demand at the confluence of the SR-57 and SR-60 are at growing risk due to increased pressure from increased population and economic demands. In 2020, this stretch of freeway has been ranked the worst truck bottleneck in California and the ninth worst truck bottleneck in the nation, as well as the second highest truck accident location in Southern California. In 2013, the Federal Highway Administration identified it as one of the 25 most “Congested Freight-Significant Locations” in the nation. This significantly impacts travel and goods movement as well as further congesting the Cities of Diamond Bar and Industry streets.
The 57/60 Confluence Project is a three-phased program of improvements consisting of ramp and interchange reconfigurations as well as the addition of auxiliary collector/distributor and bypass lanes to significantly reduce the weaving and the resulting congestion and accidents, improve overall traffic flow, reduce accident rates, and alleviate the bottleneck effect this segment has on the operation of SR-57 and SR-60 and the region.
For the latest information or to sign up for email updates, visit the project website at https://www.sgvcog.org/5760project.