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Projects: Working for You > Highways & Roads > Interstate Highway Projects > I-80/I-680/SR-12 Interchange Project

I-80/I-680/SR-12 Interchange Project

I-80 Interchange Logo

The Solano Transportation Authority (STA), and its project partners, Caltrans, and the Metropolitan Transportation Commission (MTC) are working together on major improvements to the Interstate 80, Interstate 680 and State Route 12 interchanges.

Caltrans project webpage


What's Being Planned - Long Term

This multi-year, multi-phase project is located in Solano County. The southwest project limits are near Fairfield's Green Valley and Cordelia neighborhoods, the northeast project limits near Suisun City.Interchange Segment 1 Coming Soon Sign

Once completed, the project will improve safety and travel times for motorists on I-80, I-680, Highway 12 and adjacent city streets. Features include a realignment of I-680, an improved direct connector route between I-80 and Highway 12, construction of new interchange overcrossings, new entrance/exit ramps, bike and pedestrian safety improvements, and the extension of some local streets leading to I-80 and Highway 12.

The project will benefit citizens by improving travel times, reducing cut-through traffic on local streets, and enhance safety by streamlining connections for motorists transitioning between these three major state routes linking the Bay Area, the Napa Valley, and Sacramento.

The multi-year project includes Package I through Package VII. Download the Package I Fact Sheet below.

Package IGreen Valley Road Interchange and SR12 (West) Connector - This contract constructed a new connector from westbound I-80 to westbound SR12 (West) (Jameson Canyon), crossing over (braiding with) a new on ramp from Green Valley Road to westbound I-80.

Package IIA - Eastbound SR12 to Eastbound I-80 Connector - This project would construct a new connector from Eastbound SR12 to Eastbound I-80, which will also connect two previous CMIA projects, ICP and Jameson Canyon widening projects.

Package IIB - I-680/Red Top Road Interchange - This contract will construct a new partial interchange at I-680 and Red Top Road, including realigning Lopes Road and Fermi Road to accommodate the future I-680 alignment.

Package III - I-80 Westbound to I-680 Southbound Connector - This contract will construct the first of the two main regional interstate connectors, realigning southbound I-680 approximately 0.5 miles to the west of the original location, connecting back to the existing alignment near the I-680/Red Top Road interchange.

Package IV - I-680 Northbound to Eastbound I-80 Connector - This contract will realign northbound I-680 to complement the improvements of Construction Phase 3, reconstruct the eastbound SR12 (West) connector to eastbound I-80, and reconstruct the eastbound ramps at I-80/Green Valley Road.

Package V - Northbound I-680 to Westbound SR12 (West) Connector and SR12 (West)/Red Top Road/Business Center Drive - This contract will construct the northbound I‑680/westbound SR12 (West) connector, extend Business Center Drive from its current terminus westerly across SR 12, connecting with a realigned Red Top Road at the existing I-80/Red Top interchange.

Package VI - I-80/I-680 HOV/T Connector - This contract will construct the HOV (can accommodate HOT) connector between I-680 and the eastern leg of I-80 connecting in the median of both facilities.

Package VII -Remaining I-80 / I-680 connectors - This contract will construct the eastbound I-80 to southbound I-680 and northbound I-680 to westbound I-80 connectors.


Project Updates and Timeline 

August 21, 2018: Package 2A of the I-80/I-680/SR12 interchange was awarded $53,200,000 in Trade Corridor Enhancement Program (TCEP) funds through the California Transportation Commission.  The TCEP program was created with the passage of SB1 in February 2017 and is intended to improve frieght and good movement.  With these new funds, the STA, in conjunction with Caltrans will build a new 2 lane connector from SR12 EB to I-80 EB, eliminate the current weave from I-80 EB to I-680 SB, and create a new offramp to Green Valley Rd.  Construction of Package 2A is expected to begin in Summer 2020. 


June 22, 2017: Construction Package 2A was approved by the STA Board and added to the Long-Term Plan.  With Package 1 nearing completion, each following Construction Package needs to compete for funding in a highly competitive funding environment.  As such, in order to have a Construction Package that would be more competitive, staff has developed a revised implementation plan.  A Construction Package 2A has been developed, which staff believes will compete more effectively for upcoming potential calls for projects.  Construction Package 2A is more closely tied directly to I-80 than Construction Package 2B - I-680/Red Top Road Interchange (previous CP2) and connects two previous Prop 1B funded projects, ICP and Jameson Canyon widening projects.

 Package 2A

I-80 Interchange Video

October 31, 2016: On August 9th, 2016, Caltrans invited elected officials and key staff to a ribbon cutting ceremony for the completion of the first of seven packages for the I-80/I-680/SR12 interchange, click here to watch the video!  Packages 2 and 3 are currently in design and seeking funding for Construction.

July 28, 2016: STA Board members got a close-up look at the nearly-complete construction of the I-80/I-680/SR12 Initial Construction Package of the Solano County major interchange in Fairfield. The new Connector Bridge from WB I-80 to Jameson Canyon will open to traffic in Mid-August (2016). 

STA Board I-80 I-C Construction Tour
STA Board I-80 I-C Construction Photo

STA Board members at the construction work at the I-80/I-680/SR 12 Initial Construction Package construction site.

Surveying the finishing work while standing on the deck of the new WB I-80 to Jameson Canyon Connector Bridge before it opens in mid-August.

I-80 I-C Construction STA Board I-80 I-C STA Board Tour

Pouring concrete for the slope paving at the new Jameson Canyon Connector.

View of the construction project from atop the deck.  


Project Historical Timeline

December 11, 2013: The STA Board approved the funding allocation request to MTC for $29M in Regional Measure 2 or AB1171 funds for the I-80/I-680/SR12 Interchange Project for the construction phase.

I-80 Interchange Groundbreaking Display 6-2-14March 12, 2014: The STA Board approved a Funding Agreement with the City of Fairfield for the construction of Phase I of the I-80/I-680/SR12 Interchange, the Green Valley Interchange Project, with a commitment of $10.4 million of Fairfield's local Transportation Impact Fee (TIF) over 10 years and 5 years of Regional Transportation Impact Fees (RTIF) from District 4 estimated to be $1.3 million.

June 2, 2014: The groundbreaking ceremony for package 1 (Green Valley Interchange Project) was held.

The Green Valley Rd. segment, first of seven segments, of the I-80/I-680/SR12 Interchange broke ground on construction phase June 2nd. The ceremony was attended by elected officials, Caltrans and MTC staff, and local representatives. The ceremony marks the beginning of the construction phase for this regionally significant project, which will result in relieved congestion, improved safety, and easier access.

I-80 Interchange Groundbreaking 6-2-14I-80 Interchange Groundbreaking Shovel with Tag I-80 Interchange Groundbreaking Speakers 6-2-14I-80 Interchange Groundbreaking Basket of Pin Cards


I-80 Interchange Logo



Final Environmental Impact Report (EIR) for the I-80/I-680/SR 12 Interchange Project

The California Department of Transportation (Caltrans) has prepared a final environmental impact report/environmental impact statement (EIR/EIS) for the Interstate 80/Interstate 680/State Route 12 Interchange Project  in compliance with the California Environmental Quality Act (CEQA) and State CEQA Guidelines and with the National Environmental Policy Act (NEPA) and the Council for Environmental Quality Regulations for implementing NEPA. The purpose of this Final EIR/EIS is to identify environmental effects associated with the proposed project, identify measures to avoid, minimize or mitigate those effects and disclose all substantive comments and responses on the Draft EIR/EIS.

Final Environmental Impact Report/Environmental Impact Statement (EIR/EIS) by chapter: 

Summary & Table of Contents

Chapter 1 - Proposed Project

Chapter 2 - Project Alternatives

Chapter 3.A - Affected Environment; Environmental Consequences; and Avoidance, Minimization, and/or Mitigation Measures

Chapter 3.B - Affected Environment; Environmental Consequences; and Avoidance, Minimization, and/or Mitigation Measures

Chapter 4 - California Environmental Quality Act (CEQA) Evaluation

Chapter 5 - Comments and Coordination

Chapter 6 - References Cited

Chapter 7 - List of Preparers

Chapter 8 - Distribution List


Appendix A - CEQA Environmental Checklist

Appendix B - Resources Evaluated Relative to the Requirements of Section 4(f)

Appendix C - Title VI Policy Statement

Appendix D - Summary of Relocation Benefits

Appendix E - Summary of Relocation Benefits

Appendix F - Threatened and Endangered Species List

Appendix G - Native Trees Mapped in the Study Area

Appendix H - Agency Consultation

Appendix I - Property Impacts

Appendix J - Environmental Commitment Record

Appendix K - Glossary

Appendix L - Responses to Comments

Caltrans and the STA have secured permits for the Phase I project

The following environmental documents effective May 2013 are available for viewing:

Biological Opinion 

Amended Biological Opinion

Army Corps of Engineers Permit

Water Board Permit