Traffic Advisory: Hwy 4 nighttime closure in Brentwood this weekend

Nighttime construction on the Mokelumne Trail Overcrossing will occur this weekend. Photo: CCTA

Between Lone Tree Way and Sand Creek Road Saturday, July 8 through Sunday, July 9, 2023

For Mokelumne Trail Overcrossing construction

By Ivan Ramirez, Contra Costa Transportation Authority

BRENTWOOD, CA – In partnership with the City of Brentwood, the Contra Costa Transportation Authority (CCTA) is constructing the Mokelumne Trail Bicycle and Pedestrian Overcrossing to provide safe access to cyclists and pedestrians for commuting and recreational travel, reconnecting two sides of the trail that were separated by the expansion of State Route 4.

This overnight closure will facilitate the removing of the temporary structure that was used to support the bridge and will impact State Route 4 in the eastbound direction. CCTA and the California Department of Transportation (Caltrans) have scheduled the closure during the early morning hours in order to minimize impacts to the motoring public.

In order to ensure crew and public safety during the planned construction work, a temporary nighttime freeway closure in the eastbound direction of State Route 4 will occur between Saturday, July 8 and Sunday, July 9, 2023 on the following schedule (weather permitting):

Eastbound Highway 4 will be closed between Lone Tree Way and Sand Creek Road from 9:00 p.m. on Saturday, July 8 until 7:00 a.m. on Sunday, July 9, 2023. 

Detours will be in place to reroute drivers around the closure and are planned as follows:

Eastbound traffic will be directed to exit at Lone Tree Way, go eastbound to Shady Willow Lane, then southbound on Shady Willow Lane to Sand Creek Road, before proceeding westbound on Sand Creek Road to the eastbound State Route 4 on-ramp.

Future Freeway Closures

Additional overnight closures will be needed over the course of the next several weeks (weather dependent) to facilitate ­­­­construction work­­­­­­­­ of the future Mokelumne Trail Bicycle and Pedestrian Overcrossing. Additional information regarding dates and detours will be provided once the schedule is confirmed. This project is anticipated to be complete in late summer or early fall of 2023.
About the Contra Costa Transportation Authority

The Contra Costa Transportation Authority (CCTA) is a public agency formed by Contra Costa voters in 1988 to manage the county’s transportation sales tax program and oversee countywide transportation planning efforts. With a staff of twenty people managing a multi-billion-dollar suite of projects and programs, CCTA is responsible for planning, funding and delivering critical transportation infrastructure projects and programs that connect our communities, foster a strong economy, increase sustainability, and safely and efficiently get people where they need to go. CCTA also serves as the county’s designated Congestion Management Agency, responsible for putting programs in place to keep traffic levels manageable. More information about CCTA is available at

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Mokelumne Trail Overcrossing nighttime construction CCTA

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