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Contra Loma Boulevard / L Street

ContraLoma_0040The Contra Loma Boulevard/L Street segment is the third construction segment along the corridor, between Somersville Road/Auto Center Dr. and Lone Tree Way/A Street. The project will expand the highway from four to eight lanes, including three mixed flow lanes and one High Occupancy Vehicle (HOV) lane, from just west of Contra Loma Boulevard//L Street to just west of Lone Tree Way/A Street. The project includes providing a full diamond interchange at Contra Loma Boulevard/L Street, a median wide enough to accommodate mass transit (eBART) and eliminating the G Street on- and off-ramps.

Contra Loma Blvd / L Street


CC Myers, Inc.


$48.7 million


Construction began in March 2012 and the segment is expected to be open to traffic in mid-2015.


Milestone Activities:

  • Switch westbound Highway 4 traffic onto new inside roadway to accommodate soundwall completion - Winter 2014

Recently Completed Work:

  • Completed the eastbound and westbound Highway 4 traffic switch onto the new outside roadway to accommodate median widening.
  • Continued construction of retaining walls at various locations on the project.
  • Continued placing masonry block for sound wall construction at various locations on the project.

Upcoming Work:

Nighttime bridge demolition over Highway 4 - Photo courtesy of Karl Nielsen
  • Demo old roadway alignment for stage 6
  • Continued work on various drainage systems throughout the project
  • Continue work on Contra Loma utility crossing
  • Begin CIDH piles for Contra Loma UP
  • Begin preparing the jobsite for winter rain
  • PG&E relocations completed at retaining wall 13