State Route 84/I-680 Interchange Improvements

The project proposes to conform SR-84 to expressway standards between south of Ruby Hill Drive and the I-680 interchange in southern Alameda County. The project will also improve SR-84/I-680 interchange ramps and extend the existing southbound I-680 high-occupancy vehicle/express lane northward by approximately 2 miles. The purpose of the proposed project is to alleviate traffic congestion, improve operations and safety, and improve bicycle access on SR-84 and at the SR-84/I-680 interchange.

The project is funded by Measure B, Measure BB and local and regional fund sources. Upon completion, this project will be the final segment in a series of improvements to widen SR-84 to expressway standards from I-680 in Sunol to I-580 in Livermore. For total project cost and phase information, see the project Fact Sheets tab.

Pre-Construction Outreach Meeting

May 20, 2020
(Updated May 21, 2020)

This link will remain active through Wednesday, May 27, 2020. Responses to all questions received will be posted by Wednesday, June 3, 2020.
Submit a question

Meeting Materials

Environmental Information Meeting

The public was invited to attend public meetings about the findings of the Draft EIR/EA  and the potential environmental effects of the proposed project in November 2017 in Livermore, Pleasanton and Sunol. Caltrans accepted comments on the Draft EIR/EA until December 18, 2017.

Notice of May 2016 Scoping Meetings

Caltrans, in cooperation with Alameda CTC, released the Final Draft Environmental Impact Report/Environmental Assessment with Finding of No Significant Impact (EIR/FONSI) for the State Route 84 Expressway Widening and SR-84/Interstate 680 Interchange Improvements Project. Caltrans is the lead agency under the California Environmental Quality Act (CEQA) and National Environmental Policy Act (NEPA). Alameda CTC is the implementing agency for the preliminary design and environmental review phase. Additional information is available at