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Update: Fiber Optic Infrastructure Installation Along I-80 in Contra Costa Solano And Alameda Counties

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District 4 Caltrans Logo and Building California Logo

Full closure of various eastbound and westbound I-80 on and off ramps, as well as the I-980 connector to I-880, including lane closure
Sunday through Thursday, Nightly, between 9 PM -5 AM

Interstate 80 highway shield

Contra Costa County – Caltrans announces ongoing closures associated with the Fiber Optic Infrastructure Project affecting eastbound and westbound I-80, I-980, and I-580 in Contra Costa, Solano, and Alameda Counties. Construction activities pertaining to the installation of new fiber optic infrastructure will take place during overnight hours, from 9 PM to 5 AM, to reduce disruptions to traffic flow.

Caltrans will conduct nightly lane and ramp closures on eastbound and westbound I-80 from West MacArthur Boulevard to the Carquinez Bridge. Additional nightly closures will occur near the Carquinez Bridge and from the I-980/I-580/880 interchange to the I-580/I-80 connector for the project duration.

Work is tentatively scheduled to continue through Winter 2028 and will require intermittent closures between 9:00 PM and 5:00 AM, unless otherwise noted. For real-time traffic and lane closures, visit Caltrans QuickMap.

What to Expect: *All work is weather dependent and subject to change.*

WEEK OF MAY 10–14, 2026

Lane Closures

  • None this week (subject to change)

Ramp Closures

  • Hilltop Drive EB Loop (EB I-80 on-ramp)
    • May 11
    • 9:00 PM – 5:00 AM

Local Street Closure

  • Peralta Street (EB I-80 on-ramp)
    • May 14
    • 9:00 AM – 5:00 PM

WEEK OF MAY 17–22, 2026 (subject to change)

Lane & Connector Closures

  • WB I-80 at Willow Avenue & SR-4 Connector
    • May 17–18
    • 11:00 PM – 4:00 AM

Ramp Closures

  • El Portal Drive (WB off-ramp)
    • May 19–20
    • 9:00 PM – 5:00 AM
  • El Portal Drive (EB off-ramp)
    • May 20–21
    • 10:00 PM – 5:00 AM
  • El Portal Drive (EB on-ramp)
    • May 21–22
    • 10:00 PM – 5:00 AM

Connector Closure

  • I-980 to I-880 Connector
    • May 19–22
    • 12:00 AM – 5:00 AM
    • Includes ramp closures impacting connector access

Please note some city streets may experience lane closures and detours

Motorists should expect delays, reduce speeds in work zones, and follow posted detours. Changeable message signs will be in place to assist drivers. For 24/7 traffic updates, follow 511.org on X. For real-time traffic updates, visit QuickMap.dot.ca.gov.

For more information about D4 Projects, visit: Caltrans D4 Traffic Advisory Publications

For 24/7 traffic updates, please visit 511.org: https://x.com/511SFBay
For real-time information, visit Caltrans QuickMap: https://quickmap.dot.ca.gov
Follow us on X: https://x.com/CaltransD4
Or call 1-800-472-7623, 1-800-427-ROAD for state highway conditions statewide.