Expanded Access to East County
Metal frames for bus shelters at new Antioch BART station
Grading to prepare for new Highway 4 lanes
Retaining wall construction
Processing the old roadway for recycling
Metal frame for bus shelters at new Antioch BART station
Drilling in soil nails to stabilize the ground under the new highway lanes
Constructing new Highway 4 lanes
The fifth phase of the Highway 4 Corridor Projects, the Hillcrest Avenue segment signified the highly-anticipated conclusion of construction on the main project corridor, ending in the city of Antioch. Additionally, the lane openings at Hillcrest Avenue marked a significant milestone: the official opening of all westbound highway lanes for the Highway 4 Corridor Projects.
The Hillcrest Avenue segment also required the most detailed construction work for the new BART station, including construction of a maintenance tunnel, the median platform foundation, the pedestrian overcrossing, and the entry house. A unique 145-foot-long and 13-foot-wide overcrossing was constructed to ensure the safe passage of pedestrians over the expanded four-lane westbound side of Highway 4 to the future BART platform at Hillcrest Avenue. Usage of a larger-than-life crane, as captured in the images above, was required to lift the platform into place — indeed a monumental sight to behold.
To bring regional connectivity further out into East County at a lower cost, the BART extension is being constructed with a new kind of train for the system, one that is 60% less costly to build than traditional BART trains. Additionally, thanks to leading-edge technology to be installed along the corridor, transit riders will enjoy more seamless connections between bus and BART.
– Randy Iwasaki, Executive Director, Contra Costa Transportation Authority
- Widened Highway 4 from two to four lanes including a High-Occupancy Vehicle lane in the eastbound and westbound directions
- Reconstructed the Hillcrest Avenue Interchange to provide additional local street capacity, upgraded signalized intersections, an additional westbound loop on-ramp, and ramp metering capabilities
- Constructed the BART Pedestrian Overcrossing, Station Platform, and Maintenance Tunnel at Hillcrest Avenue
- Widened Slatten Ranch Road to provide additional local street capacity and accommodate the future BART Station Parking Facilities
- Constructed auxiliary lanes in the eastbound and westbound directions of Highway 4