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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 Fall of 2015.


Milestone Activities:

  • Switch the westbound Highway 4 traffic onto the new inside roadway to accommodate the soundwall completion on the westbound Contra Loma bridge  – Summer 2015

Recently Completed Work:

  • Completed removal of the existing roadway and median.
  • Completed PG&E overhead electrical relocations on Contra Loma Boulevard at Buchanan Road.
  • Completed eBART bridge and SR4 exterior bridges at Contra Loma/ L Street.
  • Completed realignment of Claudia Court.

Upcoming Work:

Nighttime bridge demolition over Highway 4 - Photo courtesy of Karl Nielsen
  • Continue work on various drainage systems throughout the project.
  • Complete construction of remaining interior lanes and median of Highway 4.
  • Continue construction of local street improvements on Contra Loma/L Street between the on and off ramps.
  • Switch eastbound and westbound SR4 traffic to newly constructed interior lanes to allow completion of remaining highway improvements.
  • Switch northbound and southbound Contra Loma Boulevard/ L Street traffic to the newly completed exterior lanes to allow construction of new median.