Update: 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 I-580 , 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.

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

To search for current District 4 lane closure information, please click here.

Scheduled Closures and Work Activities

Week of July 6-9, 2026

Location: Eastbound I-80 from McDonald Ave to San Pablo Ave

Closures

• Eastbound I-80 Lanes #3 & #4
• Barrett Ave Westbound On ramp
• Barrett Ave local streets
• San Pablo Ave Eastbound Off-ramp

Time: 11 PM-5 AM

Location: Closures Between El Portal to Appian Way

• Eastbound #3 & #4 lanes, 10 PM-5 AM
• Richmond Pkwy Eastbound Loop On ramp (closed)
• Westbound #3 & #4 lanes, 7 PM-3 AM
• Richmond Pkwy Westbound Loop On ramp (closed)

I-980→I-880 Connector

Ramp closure, 12 AM-5 AM

• Lane Closure, 10 PM-6 AM

Location: Eastbound I-80 from Route 4 to Pomona St Off-ramp

Closures

• Eastbound I-80 Lanes #3 & #4

Time: 8 PM-4 AM

Location: Eastbound I-80 from San Pablo Ave Off-ramp to McBryde Ave

Closures

• Eastbound Lanes #3 & #4, 10 PM-5 AM
• Westbound Lanes #3 & #4, 10 PM-4 AM
• San Pablo Ave Eastbound On-ramp, 10 PM-5 AM
• Solano Eastbound Off-ramp, 9 PM-5 AM
• Solano Westbound On-ramp, 7 PM-5 AM

Vault Installation (E-40 to E-41)

Week of July 12-17

Location: Eastbound I-80 from McDonald Ave to San Pablo Ave

• Eastbound #1 & #2 lanes, 10 PM-5 AM
• Westbound #1 & #2 lanes, 7 PM-3 AM

Bridge Casing at I-980→I-880 Connector

• 12 AM-5 AM
• 10 PM-6 AM

Eastbound I-80 from Route 4 to Pomona St

Closures

• Eastbound #3 & #4 lanes, 8 PM-4 AM

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 24/7 traffic updates, follow 511.org on Twitter. For real-time traffic updates, visit
QuickMap.dot.ca.gov.

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

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