The STATUS Newsletter is published every month after the STA Board meeting to inform the public and our stakeholders of what’s happening with transportation in Solano County.
Click the link HERE to view the July 2026 STATUS Newsletter.
Date: July 23, 2026
Agency: 4 – Bay Area
Contact: Sabrina Martinez / DeNise Harding
Phone: (510) 934-5257 / (279) 234-2175
Email: sabrina.martinez@dot.ca.gov / DeNise.Harding@dot.ca.gov
One-Lane and Shoulder Closure on Westbound I-80 Carquinez (Alfred Zampa) Bridge in the cities of Vallejo and Crockett
Starting: Friday, August 7, 2026, from 6:00 PM to Saturday, August 8, 2026 7:00 PM.
SOLANO/CONTRA COSTA COUNTIES – Caltrans construction is scheduled to implement a one-lane and shoulder closure on westbound I-80 Carquinez (Alfred Zampa Memorial) Bridge on Friday, August 7, 2026, 6:00 PM, and continues until 7:00 PM Saturday, August 8, 2026. This work is in preparation for the upcoming 53-hour weekend full closure for a full deck replacement.
Schedule:
• Start – Friday, August 7, 2026, at 6:00 PM
• End – Saturday, August 8, 2026, at 7:00 PM
Note: Pedestrian/Bike Path is still accessible for the one-lane closure.
Motorists may expect delays and be aware of construction equipment on the deck bridge for the safety of workers and motorists.
Sign up for closure updates here: I-80 Westbound Carquinez (Al Zampa) Bridge Deck Rehabilitation Project or visit the Carquinez Bridge Website.
For 24/7 traffic updates, follow 511.org: https://twitter.com/511SFBay
For real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/
Date: July 22, 2026
Agency: 4 – Bay Area
Contact: Sabrina Martinez
Phone: (510) 934-5257
Email: sabrina.martinez@dot.ca.gov
Nighttime Lane, Ramp Closures of Various Locations on Interstate 80 (I-80) in Fairfield, Solano County for Trash Capture Device Project
Start of work: Friday, July 24 from 8 p.m. to 5 a.m. the following mornings
SOLANO COUNTY – Caltrans is scheduled to start installation of a Trash Capture Device project on Interstate 80 (I-80) in the city of Fairfield. Prior to construction, k-rails will be put into place in Fairfield from Pittman Road to the North Texas Street overcrossing.
This requires nighttime lane closure at multiple locations. Closures will occur nightly starting on Friday July 24, from 8 p.m. until 5 a.m. the next mornings.
This project will install trash capture systems that will stop trash from going out into water sources. It will also entail update of guardrails and construction of mainline pull outs for maintenance vehicles and erosion control. Project will be in construction until January 2027.
Locations:
• Eastbound on and off-ramps to and from Pittman Road
• Westbound I-80 near State Route 12 (SR-12)
• Westbound I-80 near Air Base Parkway
• Various locations along I-80 in Fairfield from Pittman Road to the North Texas Street overcrossing.
** All work is weather dependent and subject to change**
For 24/7 traffic updates, follow 511.org: https://twitter.com/511SFBay
For real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/
Date: July 16, 2026
Agency: 4 – Bay Area
Contact: Sabrina Martinez
Phone: (510) 934-5257
Email: sabrina.martinez@dot.ca.gov
One-way Traffic Control on Rio Vista Bridge/SR-12 Rio Vista City
Starting: July 16, 2026, from 07:00 PM to 05:00 AM the following day.
SOLANO COUNTY – Caltrans Maintenance will implement a One-way traffic control on State Route 12 at the Rio Vista Bridge for deck maintenance starting on Thursday, July 16, 2026, 7:00 PM, and continuing until 5:00 AM July 17.
Schedule:
Start – July 16, 2026, at 7:00 PM
End- July 17, 2026, at 5:00 AM
Motorists will need to be prepared for significantly longer delays than usual as they pass through the area.
For 24/7 traffic updates, follow 511.org: https://twitter.com/511SFBay
For real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/
Date: July 14, 2026
Agency: 4 – Bay Area
Contact: Sabrina Martinez
Phone: (510) 934-5257
Email: sabrina.martinez@dot.ca.gov
Nighttime Lane Closure and On/Off-Ramp Lane Closures of Various Locations on Interstate 80 (I-80) in Vallejo, Solano County
Starting July 14, 2026, from 08:00 PM to 05:00 AM the following day.
SOLANO COUNTY – Caltrans Construction will be continuing the Trash Capture Project that requires nighttime lane closure of multiple locations. Closures will occur nightly starting on Tuesday July 14, 2026, at 08:00 PM to 05:00 AM the following day until set up completes Friday, July 17, 2026. This project will install trash capture systems that will stop trash from going out into water sources. It will also entail update of guardrails and construction of mainline pull outs for maintenance vehicles and erosion control.
Schedule:
Nightly
Start – Monday, July 14, 2026, at 08:00 PM to 05:00 AM the following day
End- Friday, July 17, 2026
Locations:
July 14 – 15, 2026
• Westbound route I-80 connector on-ramp from Route-780
July 16 – Grading of Maintenance Vehicle Pullouts (MVPs)
• Eastbound I-80 on-ramp from Magazine
• Westbound I-80 mainline near Redwood St.
• Westbound I-80 Off/On- Ramp to Tennessee St.
• 0.1 Mile West and East of Route 80/780 Separator
• Westbound I-80 off-Ramp to Columbus Prkwy.
July 17 – Removal of K-Rails
• Westbound connector On-Ramp from Route 780
• Westbound I- 80 mainline near Redwood St.
• Westbound I-80 Off-Ramp to Columbus Pkwy.
**All work is weather dependent and subject to change **
For 24/7 traffic updates, follow 511.org: https://twitter.com/511SFBay
For real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/
Date: July 13, 2026
Agency: 4 – Bay Area
Contact: Sabrina Martinez
Phone: (510) 934-5257
Email: sabrina.martinez@dot.ca.gov
UPDATE: Nightly One-way Traffic Control on State Route-12 (SR-12) for Pavement Rehabilitation near Suisun City in Solano County
Schedule: Work starts on Monday June 22 at 8 p.m.
SOLANO COUNTY – Caltrans is scheduled to continue pavement rehabilitation work on SR-12 from Monday, June 22 until the end of July, Friday, July 31 starting at 8 p.m. as crews will be performing roadway improvements.
This work includes rebuilding parts of the roadside to keep the highway strong, adding material along the shoulders for safety, installing asphalt dikes to help guide rainwater away from the road, and putting down new permanent lane striping for better visibility. These activities help maintain a safe and reliable roadway for all travelers.
Eastbound and westbound lanes of SR-12 will be subject to one-way traffic control with one lane open at a time alternating directions of traffic through the work zone.
Schedule:
Mondays to Thursdays from 8 p.m. to 5 a.m. the next mornings
Fridays from 9 p.m. until 5 a.m. the next mornings
Weekend closures as needed
Saturdays from 9 p.m. until 8 a.m. the next mornings
Sundays from 9 p.m. until 5 a.m. the next mornings
**All work is weather dependent and subject to change **
For 24/7 traffic updates, follow 511.org: https://twitter.com/511SFBay
For real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/
Date and Time: Tuesday, July 7, 2026,
District/Agency: Solano Transportation Authority, City of Vallejo, Caltrans District 4 – Bay Area, Solano County
Contact: Sean Person, Sabrina Martinez
Phone: (707) 399-3217, (510) 934-5257
Email: sperson@sta.ca.gov, sabrina.martinez@dot.ca.gov
STA, Caltrans, and Local Representatives Celebrate the Opening of the Bay Area’s First Diverging Diamond Interchange in Vallejo
VALLEJO, CA – Today, with over 100 attendees standing near the famed Six Flags Discovery Kingdom Medusa Coaster, the Solano Transportation Authority (STA), in partnership with the California Department of Transportation (Caltrans), the City of Vallejo, the Metropolitan Transportation Commission (MTC), Solano County, Six Flags Discovery Kingdom, and elected officials hosted a ribbon cutting event to mark an important milestone for project partners, the Vallejo community and other nearby North Bay communities. The event celebrated the recent installation of an innovative Diverging Diamond Interchange (DDI) that enhances safety, reduces congestion, and supports easier access for motorists, pedestrians, cyclists, transit users, and the surrounding communities.
The DDI is the first of its kind in the Bay Area and only the second in the State of California to open to traffic.
“The Diverging Diamond Interchange reimagines the State Route 37 corridor as a gateway to the broader Resilient 37 Project, which will address flooding, sea level rise, bay restoration, traffic congestion, and multimodal access,” said Caltrans Director Dina El-Tawansy.
“The new Diverging Diamond will improve how people move through Solano County on foot, by bike, in a car, or via transit! This project also supports the future development like Solano 360 and connections to a planned mobility hub,” said Solano County (District 1) Supervisor, Cassandra James.
“By leveraging established relationships with regional partners, the Solano Transportation Authority is delivering a new Diverging Diamond Interchange designed to move cars, bicycles and pedestrians more safely and efficiently through Vallejo,” said STA Board Chair and Mayor of Suisun City, Alma Hernandez.
The newly redesigned interchange at the intersection of State Route 37 and Fairgrounds Drive improves traffic flow and safety while reducing congestion. The innovative Diverging Diamond Interchange design reduces conflict points by eliminating left turns against oncoming traffic. The result is both safer and easier for motorists, pedestrians, and cyclists to access and navigate.
Construction at State Route 37 (SR 37) and Fairgrounds Drive started construction in April 2025. The new DDI represents a major investment in safer, smarter, and more connected travel through Vallejo and Solano County, representing one part of the greater Resilient SR 37 Project.
The Solano Transportation Authority, in partnership with the City of Vallejo, Caltrans, and Solano County, led construction on the State Route 37/Fairgrounds Drive Interchange Improvements Project. This project supports Solano 360, a larger regional effort to revitalize the area and encourage economic growth and development. It is funded by Regional Transportation Impact Fee (RTIF) Program and the Metropolitan Transportation Commission (MTC), which has committed $18 million in funding through Regional Measure 3.
For more information, visit the State Route 37/Fairgrounds Drive Project webpage:
https://sta.ca.gov/project/redwood-parkway-fairgrounds-dr-improvement-project/
Date: 30 June 2026
Agency: Solano Transportation Authority, Caltrans District 4-Bay Area
Contact: Sean Person, Contact: Sabrina Martinez
Phone: (707) 399-3217, Phone: (510) 934-5257
State Route 37 (SR 37)/Fairgrounds Drive Interchange in Vallejo:
Watch for Temporary Closure and Detour on Northbound Fairgrounds
On Tuesday, July 7
SOLANO COUNTY – The Solano Transportation Authority (STA), in close coordination with its transportation partner, the California Department of Transportation (Caltrans), is in the process of completing construction work on the new State Route 37 (SR 37)/Fairgrounds Drive Diverging Diamond Interchange (DDI) project in Vallejo. This is the first-ever DDI constructed in the Bay Area and only the second constructed on a major highway in California. The DDI was implemented to enhance safety and improve bicycle and pedestrian access in the area.
What to Expect:
The new DDI opened to traffic on Saturday, May 16, and final construction is slated to for completion soon. A temporary roadway closure and detour are planned, as follows:
Please follow on-site signage for detours and see the embedded map for additional closure information.
We appreciate the public’s cooperation and patience as important work on this important project continues! Motorists should drive with caution in construction zones, slow down for worker safety and expect travel delays. All work is weather dependent.
Diverging Diamonds are Safer and Easier to Access
Navigating the DDI is easy, just follow the road! Watch the informational video available on the STA website or at the link below for more information.
To learn about how to use the DDI, please watch our informational YouTube video at https://youtu.be/L7QOoovsVuU?si=AOsSTF2hREcpQwhA.
For general questions, please email our project team at: SR37-FairgroundsPIO@portal3.pbid.com.
For more information about the project, please visit https://sta.ca.gov/project/redwood-parkway-fairgrounds-dr-improvement-project/
For media inquires, please view the project media bar at https://dot.ca.gov/caltrans-near-me/district-4/d4-projects/d4-37-corridor-projects/37-diverging-diamond-interchange-media-resources
The STATUS Newsletter is published every month after the STA Board meeting to inform the public and our stakeholders of what’s happening with transportation in Solano County.
Click the link HERE to view the June 2026 STATUS Newsletter.
Date: June 19, 2026
Agency: 4 – Bay Area
Contact: Sabrina Martinez
Phone: (510) 934-5257
Email: sabrina.martinez@dot.ca.gov
Nightly One-way Traffic Control on State Route-12 (SR-12) for Pavement Rehabilitation at Union Creek Bridge near Suisun City in Solano County
Schedule: Work starts on Monday June 22 at 8 p.m.
SOLANO COUNTY – Caltrans is scheduled to continue pavement rehabilitation work on SR-12 from Monday, June 22 until Wednesday, July 15 starting at 8 p.m. until as crews will be performing roadway improvements near the Union Creek Bridge near Suisun City.
This work includes rebuilding parts of the roadside to keep the highway strong, adding material along the shoulders for safety, installing asphalt dikes to help guide rainwater away from the road, and putting down new permanent lane striping for better visibility. These activities help maintain a safe and reliable roadway for all travelers. Eastbound and westbound lanes of SR-12 will be subject to one-way traffic control with one lane open at a time alternating directions of traffic through the work zone.
Schedule:
Mondays to Thursdays from 8 p.m. to 5 a.m. the next mornings
Fridays from 9 p.m. until 5 a.m. the next mornings
Weekend closures as needed
Saturdays from 9 p.m. until 8 a.m. the next mornings
Sundays from 9 p.m. until 5 a.m. the next mornings
**All work is weather dependent and subject to change **
For 24/7 traffic updates, follow 511.org: https://twitter.com/511SFBay
For real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/