I-80 Auxiliary Lanes

I-80 Aux Lanes-Logo Update cropped

About the Project

The Interstate 80 Auxiliary Lanes Project includes adding an auxiliary lane on eastbound I-80, between Highway 65 and Rocklin Road, and a fifth lane on westbound I-80, between Douglas Boulevard and Riverside Avenue. Currently, Interstate 80 is not working to its full potential because of high traffic levels during peak commute hours.

I-80 Auxiliary Lanes Project Locations

To improve traffic flow on I-80 this project will construct multiple improvements. An I-80 eastbound auxiliary lane will be constructed between the existing SR 65 eastbound on-ramp and the existing Rocklin Road eastbound off- ramp. The existing I-80 eastbound off-ramp at Rocklin Road will be widened from one lane to two lanes. The two-lane off-ramp will transition into the existing three-lane portion of the off-ramp.

The existing 5th lane on I-80 westbound will extend past the existing Douglas Boulevard off-ramp through the Riverside Avenue interchange to the existing five lanes, creating a continuous five lanes on westbound I-80 from east of Douglas Boulevard to west of Riverside Avenue. The existing I-80 westbound two-lane off-ramp at Douglas Boulevard will be converted to a one-lane off-ramp to provide space for the new 5th lane. A 5th lane on I-80 westbound between Douglas Boulevard and Riverside Avenue would provide a great benefit to the area, resulting in five continuous lanes from Highway 65 to the Capital City Freeway. An auxiliary lane on I-80 eastbound from Highway 65 to Rocklin Road would also improve safety in the area.

The video below shows Year 2020 conditions during the morning for the proposed 5th lane improvements and existing conditions for I-80 Westbound between Douglas Boulevard and Riverside Avenue (Location 2). The video begins at the Douglas Boulevard interchange and travels along westbound I-80 to the Riverside Avenue interchange.

Current Status

PCTPA and its partners (the Cities of Rocklin and Roseville, County of Placer, Caltrans, and the Federal Highway Administration) have been diligently working to get this project “shovel-ready,” so construction can begin. The Interstate 80 Auxiliary Lanes Project is now in the final design (PS&E) phase. While the final design phase has been funded by PCTPA, the construction phase of the project remains

Project Schedule and Cost

The I-80 Auxiliary Lanes project improvements are estimated to cost $18.65 million. Both state and federal environmental approvals were received in October 2016. Final design is scheduled to be complete by December 2019, and should funding become available, construction could start as early as 2020.

Environmental Documents

The final environmental document for the I-80 Auxiliary Lanes project was approved in October 2016 and Caltrans has signed off on the proposed improvements. The final Mitigated Negative Declaration and Initial Study, along with other project documents are available for download.

A public meeting for the draft environmental document for this project was held at the PCTPA Board Meeting on January 27, 2016 at the Placer County Community Development Resource Agency, 3091 County Center Drive, Auburn, CA. A Public Notice was published in the Auburn Journal, Roseville Press Tribune, and Placer Herald and is available for download.

The presentation from the PCTPA January 27, 2016 Board Meeting is also available for download.

A public meeting for the preferred alternative for this project was held at the PCTPA Board Meeting on April 27, 2016 at the Placer County Board of Supervisors Chambers, 175 Fulweiler Avenue, Auburn, CA. The presentation from the PCTPA April 27, 2016 Board meeting is available for download.


For more information about this project, please contact PCTPA at 530-823-4030 or pctpa@pctpa.net.

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