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California State Route 57 (SR-57) is a major north-south freeway corridor that provides commuters access to and from the San Gabriel Valley, portions of Los Angeles, San Bernardino, Orange and Riverside Counties. California State Route 60 (SR-60) is a major east-west freeway corridor that is parallel to and south of the Interstate 10 (San Bernardino Freeway) and links commuter and commercial travel to and from the San Gabriel Valley, Pomona Valley, San Bernardino and Riverside Counties to the Los Angeles Central Business District.

When the existing freeway interchange connecting SR-57 with SR-60 was designed, the underlying “Valley-shaped” terrain forced both freeways into a common alignment for a distance of 2-miles in the vicinity of Grand Avenue, referred to as the “Confluence”. Caltrans has identified the 57/60 Confluence as one of the five most congested segments within Caltrans District 7, which encompasses Los Angeles County and Ventura County. A Freight Performance Measures Analysis of 30 Freight Bottlenecks conducted by the American Transportation Research Institute in December 2014 ranks the Confluence as the #8  bottleneck in the Nation and #1 for freight delays and truck accidents in California.


More than 356,000 commercial and personal vehicles use the interchange every day an average of 1 million vehicles every 3 days, or about 100 million vehicles annually.


In 2005, Metro initiated the 57/60 Feasibility Study, which explored a wide range of potential improvements to the 57/60 Interchange, including “New Connections,” “Symmetric Widening,” and “Double-Deck” concepts. At its conclusion, the Feasibility Report concluded that of the three final conceptual improvements, all three were feasible for traffic operations; the New Connections concept provides improved operations through the main interchange area at the lowest overall cost and the highest cost benefit ratio. The New Connections concept formulated by Metro includes most of the improvements proposed for the 57/60 Confluence Project.


The current plan is to divide the total project into three phases with multiple contract packages. By phasing the project, the project will be built in a sequence that best utilizes available funds from the City of Industry, and the Los Angeles Metropolitan Transportation Authority. The project phasing also follows a logical sequence that will facilitate construction activities in subsequent phases.

PHASE I: Currently Under Construction

Construct the westbound Grand Avenue on-ramp and the westbound auxiliary lane on SR-60. Construct interim operation improvements at the Grand Avenue Interchange. 

PHASE IIA: Currently Under Construction

Construct improvements on the arterial highways, including Grand Avenue south of the SR-60 Interchange, Approximately 0.4 miles of Golden Springs drive, and rebuild the intersection of Grand Avenue and Golden Springs Drive. 

PHASE IIB: Currently Under Construction

Construction of a westbound off-ramp and an auxiliary lane to Grand Avenue. 

PHASE III: Planning in Progress

Construct Grand Avenue Bridge over SR-60, eastbound bypass off-ramp, and bypass connector. The $205M for construction is included in Measure M with a construction start date of 2025. A $35M FASTLANE grant will accelerate the start date to 2019-2020.





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