Interstate 680 / State Route 4 Interchange Improvements


A recent headline announced that the California Transportation Commission approved $34 million in funding for upgrades to the Interstate Highway 680/state Highway 4 interchange. Concord Assemblymen Tim Grayson was active in securing this funding. Because of the size of the project and previous funding issues the Contra Costa Transposition Authority (CCTA) has split the project into many phases and will include construction of a three-level interchange with two-lane direct connector ramps for the high-demand northbound to westbound and eastbound to southbound movements. The project will also widen Highway 4 from four to six lanes, eliminate the current eastbound lane drop on Highway 4 west of the Pacheco Boulevard interchange, and construct auxiliary lanes to the adjacent interchange ramps at Morello Avenue and Solano Way on Highway 4, and Pacheco Boulevard and Concord Avenue on Interstate 680.

The phases are:

  • Phase 1 – NB I-680 to WB SR 4 connector.
  • Phase 2 – EB SR 4 to SB I-680 connector.
  • Phase 3 – SR 4 widening: Morello Avenue to SR 242 and replacement of Grayson Bridge.
  • Phase 4 – SB I-680 to EB SR 4 connector.
  • Phase 5 – WB SR 4 to NB I-680 connector.

This round of funding will be used to start Phase 3.

The 680/4 Phase 3 project will widen State Route 4 in the median to provide a third lane in each direction from Morello Avenue to State Route 242. Scope of work includes widening five structures at Pacheco Blvd, I-680, Walnut Creek, Solano Way and Peralta Road, installation of safety lighting, and replacement of Grayson Creek Bridge in each direction of SR 4. The plan is to advertise the project in July 2018 following the California Transportation Commission meeting on June 26/27. Construction contract is planned for award in September 2018 assuming no protests and approval from the CCTA board, with ground breaking in October 2018. Construction duration is around 2 years.

This project was “shovel ready”, but without SB 1 we would not be in a position to advertise the project.

Read more about the project from CCTA

About Kevin

Councilmember - City of Oakley, Manager of Mainframe Operations and Optimization – USS-POSCO INDUSTRIES, Co-Founder and Board Member - Friends of Oakley A Community Foundation, Commissioner - Contra Costa Transportation Authority, Board Member - Tri Delta Transit, Transplan, San Joaquin Joint Powers Authority and RD 2137, Advisory Board – Opportunity Junction
This entry was posted in Highway 4 Construction, Highways. Bookmark the permalink.

1 Response to Interstate 680 / State Route 4 Interchange Improvements

  1. devinserpa says:

    I think there’s more demand for northbound to eastbound than the proposed northbound to westbound.

    Is the eastbound to southbound going over the storage place? Or is it getting bought out?

    Also, the northbound to westbound looks like it goes over the Pacheco Transit Hub. Or perhaps just the old park and ride property… If it does go over the Transit Hub I hope more lighting is put in first.

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