Home Contra Costa County CALTRANS Set For 55-Hour Full Freeway Closure Between Discovery Bay and Tracy Blvd

CALTRANS Set For 55-Hour Full Freeway Closure Between Discovery Bay and Tracy Blvd

by ECT

SAN JOAQUIN COUNTY – The California Department of Transportation (Caltrans) has scheduled a 55-hour full highway closure of State Route 4 for culvert rehabilitation work due to equipment availability issues.

The 55-hour full closure is scheduled to begin at 10:00 p.m. on Friday, September 24, until 5:00 a.m. on Monday, September 27, 2021. The original 55-hour full closure was scheduled to take place September 17-20, 2021.


During this closure, an existing 36-inch corrugated metal pipe will be removed and replaced with a 42-inch reinforced concrete pipe to extend the service life of the stormwater drainage systems and to ensure traffic safety, reliability, and integrity of the highway system.


  • Westbound SR-4 travelers: The detour begins at the Tracy Boulevard intersection; south on Tracy Blvd; west on I-205; north on Mountain House Parkway; northwest on Byron Road to SR-4.
  • Eastbound SR-4 travelers: The detour begins at the Byron Road intersection; southeast on Byron Road; south on Mountain House Parkway; east on I-205; north on Tracy Blvd to SR-4.
  • Restricted access past these locations will only be allowed for emergency vehicles and those trying to reach local businesses and work locations within the closure.

Caltrans will utilize flaggers, as well as overhead and portable changeable message signs, alerting motorists of the detour and potential delays which are expected to be approximately 30-45 minutes.

This work is scheduled to begin as listed, but is subject to change due to traffic incidents, weather, availability of equipment, and/or materials and construction related issues.

For the safety of workers and other motorists, please Be Work Zone Alert.

Information released by CALTRANS

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