We're building a better drive where the 57 meets the 60.

SR-57/SR-60 Interchange Improvements Project

Project Overview

The State Route 57 (SR-57) and State Route 60 (SR-60) area of confluence, between the City of Diamond Bar and City of Industry, is among the worst segments of freeway in the nation for traffic congestion and accidents. This two-mile long area is also the busiest truck freight route in the country, which adds additional stress and conflict as cars and trucks contend for position on the road. However, this is about to change.

This Project includes the following improvement sections:

  • SR-60 Eastbound Grand Av bypass off-ramp
  • Grand Av Interchange
  • SR-60 Eastbound Bypass Connector
  • Diamond Bar Bl Eastbound On-ramp
  • Sound Walls and Retaining Walls

About the Project

Metro, together with the City of Diamond Bar and City of Industry, the San Gabriel Valley Council of Governments (SGVCOG) and in cooperation with the California Department of Transportation (Caltrans) District 7, is preparing to complete the last of the improvements for the SR-57/SR-60 Confluence Project, which began in 2011. These final improvements, known as the SR-57/SR-60 Interchange Improvements Project, launched in Fall 2018 and will begin by advancing design of the project improvements and design features, and reevaluating environmental work in preparation for final construction.

Project Schedule

    Environmental Revalidation - Completed June 2021

    Construction - Mid 2022 to Late 2027

Other related projects

    Grand Av / Golden Springs Dr Improvements

    Golf Course Improvements

Project Area Map

Project Goals

  • Increase freeway capacity while reducing traffic congestion
  • Improve traffic flow and community connections
  • Increase freight travel efficiency
  • Improve freeway operations and safety
  • Enhance quality of life

Project Components

01 / 05

SR-60 Eastbound Grand Av Bypass Off-ramp

A mile long, two-lane ramp that begins immediately after the Southbound SR-57 diverge, crossing over the northbound SR-57 lanes to exit Grand Av.

Grand Av Interchange

The overpass bridge will be reconstructed for eight lanes with a new loop on-ramp for southbound Grand Av to eastbound SR-60. Compare existing and planned improvements to the interchange.

SR-60 Eastbound Bypass Connector

A half-mile long elevated bypass for northbound SR-57 and Grand Av eastbound on-ramp traffic to cross over Diamond Bl and eastbound on SR-60.

Diamond Bar Bl Eastbound On-Ramp

Widened from two to three lanes to join eastbound SR-60 past the bypass connector.

Sound Walls and Retaining Walls

Traffic noise from highway improvements can adversely affect local communities if not properly abated through the inclusion of sound walls. Sound walls and retaining walls are used for separating highway surroundings from both sound and dirt runoff. The analysis conducted as part of the project analyzed new and improved sound walls and retaining walls that are meant to provide abatement through the reduction of traffic noise. The 28 new and existing walls range in height from 8- up to 36-feet and in some cases may exceed the height of the existing walls.

Other Related Projects

Grand Av / Golden Springs Dr Improvements

Improvements include:

  • An additional northbound through lane
  • Additional southbound approach lane
  • A westbound right-turn lane
  • Increased traffic lane widths along Grand Av
  • Sidewalk widening
  • New decorative traffic signals
  • New street lights on the north side of Golden Springs Dr
  • Replacement of the golf cart tunnel underneath Grand Av

Construction - Early 2021 to Early 2023

Contact

Diamond Bar Golf Course Improvements

The planned freeway improvements directly impact six golf holes located along the freeway frontage and Grand Av. The project will realign and reconfigure six holes in the westerly portion of the course and three in the easterly half to maintain the overall course yardage of 6,807 and provide the same total course par of 72.

Golf Course Realignment

Construction - Late 2021 to Early 2023

Contact

    Eric C. Shen

    San Gabriel Valley Council of Governments (SGVCOG)

    Chief Engineer

     626.962.9292 

For more information visit:  sgvcog.org/5760project-dbgc 

SR-57/SR-60 Confluence Overview

Use the slide bar for a comparison view of the before and after project improvements.

Project Completion - Late 2027

Contact Us

For more information visit  metro.net/sr57-60 

Mail:

    Robert Machuca, Metro Project Manager

    Metro

    One Gateway Plaza, M/S 99-18-2

    Los Angeles, CA 90012