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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 I -  Proposes to improve connector routes from westbound I-80 to westbound SR 12 and to modify the westbound onramp from Green Valley Road, as well as the I-80/Green Valley Road Interchange. Construction to begin in Summer 2015.

Package II - Re-align Lopes Road near Rodriguez High School.  Design is complete.  Construction contingent of funding availablilty.

Package III - Design is complete.  Construction contingent of funding availablilty.

Package IV - Design contingent on funding availablilty.

Package V - Design contingent on funding availablilty.

Package VI - Design contingent on funding availablilty.

Package VII -Design contingent on funding availablilty. 


Project Updates and Timeline 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/SR 12 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.  

I-80/I-680/SR 12 Interchange Monthly Construction Report May 2016

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