Imperial Highway and Pioneer Boulevard


  • Closures

    Weekly Construction Updates

  • Project Information

    Improvements: HOV lane, one mixed-flow lane in each direction, interchange modifications at San Antonio Dr. undercrossing, Imperial Highway undercrossing, Pioneer Boulevard undercrossing, and Orr and Day Road.
    Start Date: 2013
    Completion: This project is primarily complete as of August 1, 2019. (Plant establishment & punch list in progress).
    Currently: 96% complete.
    Overall Project Cost: $323 Million
    Project Construction Cost: $144.5 Million

    The new Imperial Highway on ramp to northbound I-5 is open.
    The new Imperial Highway off ramp from southbound I-5 is open.
    The new San Antonio Dr. on ramp to  southbound I-5 is open.

    Pioneer Bridge: Construction complete.
    San Antonio Bridge: Construction complete.
    Imperial Highway Bridge: Construction complete.

    Final striping and signal installation is complete on Imperial Highway, Pioneer Blvd., and San Antonio Dr. / Norwalk Blvd. at the I-5 interchanges.

    Crews have completed placing decorative tile on the walls of the San Antonio, Imperial Highway, and Pioneer Blvd. bridges under I-5.

    Photos below from under the San Antonio Bridge on July 23:

    New paving on Imperial Highway at the I-5 interchange and the decorative concrete wall are complete. Traffic signal and sign installation are also complete. Photos below from June and July:

    New paving on Pioneer Blvd. and the tile walls under the bridge at the I-5 interchange are complete. Photos below from June 18:

    The new Norwalk Blvd. off ramp from northbound I-5 opened to the public on November 21, 2018:

    The Pioneer Blvd. on ramp to northbound I-5 is permanently closed to allow the addition of lanes to northbound I-5.

    Project Benefits

    • Increasing capacity by widening the freeway
    • Accommodating future projected traffic demands
    • Extending the HOV lanes.
    • Enhancing safety
    • Revitalizing our I-5 community



Project Map

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