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Lone Tree Way / A Street

Cavallo Road Bridge Demo - Photo Courtesy of Karl NielsenThe Lone Tree Way/A Street segment is the fourth segment along the corridor, between Contra Loma Boulevard/L Street and Hillcrest Avenue. 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 Lone Tree Way/A Street to just west of Hillcrest Avenue. The project includes reconstruction of the Lone Tree Way/A Street Interchange and widening the highway median to accommodate mass transit (eBART).

Lone Tree Way / A Street Map


Bay Cities/Myers, Joint Venture


$59.8 million


Construction began in August 2012 and the segment is expected to be open to traffic in late 2015.


Milestone Activities:

  • Switch the eastbound Highway 4 traffic onto the new westbound Cavallo bridge to allow the construction of the eastbound Cavallo bridge and adjoining roadway improvements- Spring 2015

Recently Completed Work:

  • Completed the construction of the foundations for portions of the eastbound Lone Tree/A Street bridge.
  • Completed the construction of the foundation for the Lone Tree/A Street eBART bridge.
  • Completed the construction of the foundation for the westbound Cavallo Road bridge .
  • Completed the construction of the foundation for the Cavallo Road eBART bridge.
  • Completed the traffic switch of westbound Highway 4 traffic into median to accommodate the westbound Highway 4 widening.
  • Completed the construction of an interior portion of the Pedestrian Undercrossing  east of Lone Tree/A Street.

Upcoming Work:

Cavallo Road Bridge Demo - Photo Courtesy of Karl Nielsen

  • Continue construction of various drainage improvements on the project.
  • Continue construction of the the westbound  Highway 4 interior lanes and median between G Street and Hillcrest Avenue.
  • Continue construction of the superstructure for a protion the eastbound Lone Tree Way/ A Street bridge.
  • Continue construction of the superstructure for the eBART bridge at Lone Tree Way/ A Street.
  • Continue construction of the superstructure for a portion of the westbound Cavallo bridge.
  • Continue construction of the superstructure for the eBART bridge at Cavallo Road .
  • Continue construction of various retaining walls throughout the project.