Fiber Optic Infrastructure Installation Along I-80 in Contra Costa Solano and Alameda Counties

Full closure of various eastbound and westbound I-80 on and off ramps, as well as the I-980 connector to I-880, I-80 to SR-4 , including lane and local street closures. Sunday through Thursday, Nightly, between 9 PM -5 AM

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, Day time work may occur with freeway shoulder and local street closures between 7:00 AM and 3:30 PM. To search for current District 4 lane closure information, please click here.

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

WEEK OF MAY 17-22, 2026

• Dover Street→ 31st (Daytime Street closure 7:00AM- 3:30PM)
  • May 19-21

WEEK OF MAY 24-25, 2026

Lane & Connector

• McDonald Ave→ San Pablo Ave (far 2 right lanes closed)
  • May 27-29 • 11 PM-5 AM
• Carquinez Bridge Casing
  • May 26-29 • No closures
• Carquinez Bridge - East & Westbound I-80 lane closures (up to two lanes closed)
  • May 26-28• 11 PM-5 AM
• Dover Street → 31st Street (Local Street Closure)
  • May 26-28 • Surface streets
• Powell Street & Frontage Crossings
  • May 28-29 • 10 PM-5 AM
• EB I-80 from the I-580 interchange (MacArthur Maze) to the Ashby Avenue exit
  • May 28-29 • 11 PM-5 AM

WEEK OF MAY 31 - JUNE 5, 2026

Lane & Connector

• McDonald Ave → San Pablo Ave (far 2 right lanes closed) EB I-80
  • May 31-June 5 • 11 PM-5 AM

Ramp & Connector

• I-980→I-880 Connector
  • May 31-June 5 • 12 AM-5 AM
• I-980→ I-880 Positive Locate ramp and Connector
  • June 1-4 • 12 AM-5 AM

Other Work

• Carquinez Bridge Casing
  • June 1-5 • No closures

Please note some city streets may experience traffic control with flaggers to assist drivers through 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 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.