They’re Open – State Route 160/Highway 4 Direct Connector Ramps


0925-00601

The existing State Route 160/Highway 4 interchange previously included only two of the four possible interchange movements. The State Route 160/Highway 4 Direct Connector Ramps project created a much-needed connection between the Senator John A. Nejedly (Antioch) Bridge and Highway 4 by constructing two new connector ramps, one connecting westbound Highway 4 to northbound State Route 160, and one connecting southbound State Route 160 to eastbound Highway 4. Additionally, this project eliminates the U-turn previously required at Hillcrest, removes through traffic on Oakley’s city streets, and improves access for Eastern Contra Costa County.

The project also added a 12-foot auxiliary lane to State Route 160 in both directions between the State Route 160/Highway 4 Interchange and the East 18th/Main Street Interchange, as well as new retaining walls. The southbound separation structure accommodates a future rail transit (BART) extension in the median of Highway 4.

Construction was contained within the existing right-of-way and progressed in phases. Initial substructure work involved installing cast-in-drilled-hole (CIDH) piles and driving steel shell piles for the ramp foundations, as well as constructing abutments. After temporary support structures (falsework) were erected, the bridge superstructure, or roadway, was constructed, then paved. New soundwalls were also installed as part of this project.

MAJOR COMPONENTS

  • 2.62 miles of new lane miles between Senator John A. Nejedly (Antioch) Bridge and Highway 4
  • Additional auxiliary lane on State Route 160 in both directions » Two new soundwalls
  • Retaining walls

CONSTRUCTION

  • Contractor: RGW Construction, Inc.
  • Construction cost: $33.5 million
  • 18,500 cubic yards of concrete poured

SCHEDULE

  • Start of work: Spring 2014
  • Completion of work: February 2016

FUNDING

  • Bay Area Toll Authority (BATA) Bridge Toll funds: $50 million
connector 1

From the connector ramp looking into Oakley

connector 2

Looking north on the ramp connecting southbound 160 to eastbound 4

WP_20151120_08_38_32_Pro

connector 3

WP_20160229_09_34_27_Pro

Ramp connecting Highway 4 west bound with Highway 160 north bound

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About Kevin

Mayor - City of Oakley, Data Center Manager of Mainframe Operations and Optimization – USS-POSCO INDUSTRIES, Co-Founder and Board Member - Friends of Oakley A Community Foundation, Advisory Board – Opportunity Junction, Commissioner - Contra Costa Transportation Authority, Board Member - Tri Delta Transit and Transplan
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