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The original item was published from 8/4/2021 4:20:53 PM to 8/31/2021 10:05:00 PM.

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Posted on: June 28, 2021

[ARCHIVED] Confluence Project Gets $30 Million Grant

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The SR 57/60 Confluence Project has received a major boost in the form of a $30 million federal grant from the U.S. Department of Transportation.

The Project was among those selected to receive funding as part of the fiscal year 2021 round of Infrastructure For Rebuilding America (INFRA) discretionary grant program, created to fund transportation projects of national and regional significance.

With this award of INFRA funds, the third phase of the larger SR 57/60 Confluence Project is on track to get underway by August 2022, which is two full years ahead of previous schedule. Improvements in this phase will be concentrated along the 2.5-mile-long segment where the two highways merge creating major bottleneck conditions that contribute to severe congestion and forced lane changes that often result in fatal collisions. To address the eastbound weaving conflicts, the improvements include: 

  • Construction of a new eastbound travel lane.
  • Construction of a new eastbound SR-60 off-ramp bypass lane to Grand Avenue that eliminates weaving movements for traffic exiting SR-60 to Grand Avenue.
  • Reconstruction of the Grand Avenue eastbound on/off ramps including an exclusive ramp on viaduct for Grand Avenue traffic accessing SR-60 that eliminates weaving movements in the eastbound direction east of Grand Avenue.
  • Widening of Grand Avenue and reconstruction of a new wider bridge over SR-60.
  • Construction of an eastbound SR-60 on-ramp bypass from the northbound SR-57 split. 
  • Reconstruction of the eastbound SR-60 Diamond Bar Boulevard on-ramp.


Built in the 1970s, the 2.5-mile stretch of SR-57/SR-60 confluence has consistently been ranked among the top 10 most congested truck bottlenecks in the nation. It is currently ranked the second worst truck-involved accident location in Southern California, according to the California Highway Patrol. Both SR-57 and SR-60 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.

The third phase is currently in the Plans, Specifications and Estimate (PS&E) stage, and is anticipated to be completed by the end of 2021. Metro is leading the development and design of the improvements, working closely with the California Department of Transportation (Caltrans), San Gabriel Valley Council of Governments (SGVCOG), and the City of Diamond Bar, and City of Industry.

Two related improvement projects are currently underway in the project area: the Grand/Golden Springs Improvements Project and the Diamond Bar Golf Course Renovation. Construction is anticipated to complete in 2023 for Grand/Golden Springs and in December 2022 for the golf course.

Support and Funding

Over the years, the Project has received significant support from a number of U.S. legislators, including U.S. Sens. Dianne Feinstein and Alex Padilla, as well as U.S. Reps. Young Kim (CA-39), Grace Napolitano(CA-32), Linda T. Sánchez (CA-38), Ken Calvert (CA-42), Norma J. Torres (CA-35), Michelle Steel (CA-48), and Judy Chu (CA-27). 

The Project, which has a total cost of $420.2 million, is funded through a mix of local, state and federal funds, including Measure M local sales tax revenue funds, the California State SB1-funded Trade Corridor Enhancement Program, and Infrastructure For Rebuilding America (INFRA) grant dollars.

Additional information on the project is available at

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