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 HERE to view the November 2025 STATUS Newsletter.
Date: November 24, 2025
Agency: Solano Transportation Authority, Caltrans District 4-Bay Area
Contact: Contact: Sean Person, Geoffrey Johnson
Phone: (707) 399-3217, (510) 421-7348
State Route 37/SR-37- Fairgrounds Drive Interchange- Vallejo
Construction Shifts into Gear- December 2025
Watch for Traffic Lane Shifts/Overnight Ramp Closures
SOLANO COUNTY – The Solano Transportation Authority (STA), in close coordination with its transportation partner, the California Department of Transportation (Caltrans), has started construction work on the new State Route 37 (SR 37)/Fairgrounds Drive Interchange Project in Vallejo. The interchange improvement project will enhance motorist safety and improve bicycle and pedestrian access with construction of a new divergent diamond interchange. This is the first-ever divergent diamond interchange (DDI) constructed in the Bay Area and only the second-ever constructed on a major highway in California.
What to Expect During Initial Construction Work
Construction at SR 37 and Fairgrounds Drive started construction in April 2025. The site is near the Six Flags Discovery Kingdom Theme Park and the Solano County Fairgrounds. In May traffic in both directions was shifted to the west side of SR 37 and a temporary pedestrian walkway was constructed. Beginning mid-December, traffic will be shifted to the east side of SR 37, under the freeway.
Weather permitting, the following construction-related activities are scheduled to happen in mid-December, 2025.
Motorists should drive with caution in construction zones and expect travel delays. All work is weather dependent.
For general questions, please email our project team at: SR37-FairgroundsPIO@portal3.pbid.com.
For more information about the project and to view a video explaining the DDI design, please visit https://sta.ca.gov/project/redwood-parkway-fairgrounds-dr-improvement-project/.
STA and Caltrans thank the motoring public for its patience and understanding as we work to improve and maintain our state’s highways.
Date: November 13, 2025
District: District 3 – Marysville
Sergio Aceves, District 3 Director
Contact: Dennis Keaton dennis.keaton@dot.ca.gov
Phone: (916) 825-5252
UPDATE – 55 Hour Closure Friday, November 14 through 4 a.m. Monday, November 17 for the Rio Vista Bridge is Postponed due to Weather
RIO VISTA – Caltrans is advising motorists that this weekend’s 55-hour closure for repair work on the ongoing $27.2 million State Route 12 (SR 12) Rio Vista Bridge (Helen Madere Memorial Bridge) Rehabilitation Project has been postponed due to weather. The bridge will remain open to motorists.
A rescheduled weekend has not yet been determined.
All construction schedules are subject to change due to weather conditions, equipment and/or material availability, or other unexpected events.
Caltrans District 3 is responsible for maintaining and operating 4,385 lane miles in 11 Sacramento Valley and Northern Sierra counties. Caltrans reminds motorists to “Be Work Zone Alert” and slow in construction zones for the safety of travelers and crews performing these improvements.
The department will issue construction updates on X @CaltransDist3 and on Facebook at CaltransDistrict3. For real-time traffic, click on Caltrans’ QuickMap or download the QuickMap app from the App Store or Google Play.
For real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/
Date: October 29, 2025
District: 4
Contact: Sabrina Martinez
Phone: (510) 934-5257
Email: sabrina.martinez@dot.ca.gov
SOLANO COUNTY – Caltrans is continuing to work on installation of new electrical equipment to improve pedestrian safety at unsignalized crosswalks around Solano County. This includes new ADA curb ramps and restriping the cross walks around the intersection.
Work will continue on Ryder St. and Arkansas St. along SR-29. Installation of foundations for new electrical poles will require a lane closure. Starting Monday, November 3 to November 14 a single lane will be closed with one city street open in the direction of travel during the day from 9 am to 3 pm. All work is dependent on weather.
Pedestrians are directed to utilize the crosswalk on the other side of the road via signage barricades on the sidewalk.
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/
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 HERE to view the October 2025 STATUS Newsletter.
Date: October 20, 2025
District: 4
Contact: Geoffrey Johnson/Vince Jacala
Phone: (510) 421-7348 / (510) 385-7069
Email: geoffrey.johnson@dot.ca.gov / vince.jacala@dot.ca.gov
Night Lane Closure, One-Way Traffic Control for Eastbound State Route 37 (SR-37) Paving Project in Sonoma County
Work scheduled to start Monday, Oct. 27 from 9 p.m. to 5 a.m. each night
SOLANO COUNTY – Caltrans has scheduled paving work that will require a lane reduction and one-way traffic control on Eastbound State Route 37 (SR-37) just west of the Sonoma Creek Bridge.
One-way traffic control, with a pilot vehicle, will be using the eastbound lane of travel to lead traffic. Work is scheduled to begin the night of Monday, Oct. 27. Working hours are between 9 p.m. and 5 a.m. the next mornings.
There is tentative work scheduled the week of Monday, Nov. 3 during the same hours.
Work is expected to last about five days. All construction is limited to overnight hours in the area.
Construction includes grinding and paving the existing area near between Nobel Road and Skaggs Island Road. No on- or off-ramps on SR-37 are expected to be closed during construction.
A separate paving project on Westbound SR-37 began on Wednesday, Oct. 15 and will continue into the week of Monday, Oct. 20. Hours also are 9 p.m. to 5 a.m. the next mornings for that work.
Please drive with caution. Slow for the Cone Zone and Be Work Zone Alert. Caltrans thanks motorists for their patience while we work to maintain our state’s highways, bridges, and tunnels.
For real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/
For 24/7 traffic updates, follow 511.org: https://twitter.com/511SFBay
Date: October 10, 2025
District: 4
Contact: Sabrina Martinez
Phone: (510) 934-5257
Email: sabrina.martinez@dot.ca.gov
Lane Closure on I-80 Westbound On-Ramp from Springs Rd/ Solano Ave.
Schedule: Lanes scheduled to be closed from 9 am to 3 pm
SOLANO COUNTY – Caltrans is currently working on the installation of new electrical equipment to improve pedestrian safety at unsignalized crosswalks around Solano County. This includes new ADA curb ramps and restriping the crosswalks around the intersection.
Current work is happening on Solano Ave/Westbound Interstate – 80 & Glen Cove Rd/Eastbound Interstate -780. This project currently requires a single lane closure with one city street lane open in the direction of travel during the day from 9 am to 3 pm until Friday, October 17.
Pedestrians are directed to utilize the crosswalk on the other side of the road via signage barricades on the sidewalk.
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: October 6, 2025
District: 4
Contact: Sabrina Martinez
Phone: (510) 934-5257
Email: sabrina.martinez@dot.ca.gov
UPDATE: DELAY DUE TO UPCOMING WEATHER CONDITIONS
Nighttime Lane Closures on State Route 29 (Sonoma Boulevard) from the Napa/Solano County Line at Mini Drive to Missouri Street
THURSDAY, OCT 16 through Nov. 21, lane is scheduled to be closed from 8 p.m. until 6 a.m. each night
SOLANO COUNTY – Caltrans is scheduled to start construction on the Rehabilitation and Complete Street Project on State Route 29 (Sonoma Boulevard) in October.
This work is scheduled to begin Thursday Oct. 16, from the Napa/Solano County line at Mini Drive and span the 6 miles to Cal Poly Maritime Academy. From Oct. 16 to Nov. 21, work is scheduled from 8 p.m. until 6 a.m. each night. Work will be seen from the Napa/Solano County line at Mini Drive to Missouri Street.
All work depends on weather.
The project is estimated to be completed in the Fall of 2026.
This project will consist of the deconstruction of current medians and curbs. The construction activities may be noisy and create dust at times as work will be done by jackhammering and other construction equipment.
This project will require a lane closure with one lane open for motorist and traffic control in place. Daytime access is expected to be available for motorists. While construction is occurring, there will be a CHP presence in place.
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: October 6, 2025
District: 4
Contact: Sabrina Martinez
Phone: (510) 934-5257
Email: sabrina.martinez@dot.ca.gov
Nighttime Lane Closures on State Route 29 (Sonoma Boulevard) from the Napa/Solano County Line at Mini Drive to Missouri Street
Monday, Oct. 13 through Nov. 21, lane is scheduled to be closed from 8 p.m. until 6 a.m. each night
SOLANO COUNTY – Caltrans is scheduled to start construction on the Rehabilitation and Complete Street Project on State Route 29 (Sonoma Boulevard) in October.
This work is scheduled to begin Monday, Oct. 13, from the Napa/Solano County line at Mini Drive and span the 6 miles to Cal Poly Maritime Academy. From Oct. 13 to Nov. 21, work is scheduled from 8 p.m. until 6 a.m. each night. Work will be seen from the Napa/Solano County line at Mini Drive to Missouri Street.
All work depends on weather.
The project is estimated to be completed in the Fall of 2026.
This project will consist of the deconstruction of current medians and curbs. The construction activities may be noisy and create dust at times as work will be done by jackhammering and other construction equipment.
This project will require a lane closure with one lane open for motorist and traffic control in place. Daytime access is expected to be available for motorists. While construction is occurring, there will be a CHP presence in place.
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: October 3, 2025
Agency: 4 – Oakland
Contact: Sabrina Martinez
Phone: (510) 934-5257
Email: sabrina.martinez@dot.ca.gov
Nighttime Lane/Ramp Closures on State Route 113 in and near Dixon from Parkway Boulevard to SR-113/Interstate-80 (I-80) Interchange
Schedule: Lanes scheduled to be closed from 8 p.m. until 6 a.m. each night
SOLANO COUNTY – Caltrans continues its work on State Route 113 (SR-113), also known as 1st Street, which goes through the City of Dixon. The project started on the first week of September, it is scheduled to finish within 30 working days.
October 5, 2025, Sunday Night, crews will start the striping work, along with any finishing touched needed to complete the project. This will occur down the length of project from Parkway Boulevard to SR-113/ I-80 Interchange. Work is scheduled to conclude around October 16, 2025. All work depends on weather and the end date may change due to any weather delays.
This project will require multiple lane, ramp and portions of the highway closures during construction. The number of lanes closed will depend on the closure location within the project limits.
The following on- and off-ramps will be affected by the closure and will have intermittent detours as follows:
Detour for Northbound Route 113 Connector to Westbound I-80
Drivers on Eastbound I-80 will take the SR-113 off-ramp to Pedrick Road; Then on Pedrick Road take a left to enter the Westbound I-80 on-ramp. Drivers will continue down Westbound I-80 and take the connector to Currey Road.
Drivers on Northbound Route 113 wanting to go to Northbound Currey Road. Will take the Eastbound I-80 on ramp and take the Pedrick Road off-ramp. A left turn will be taken on Pedrick Road to enter the Westbound I-80 on-ramp. Drivers will continue down Westbound I-80 and take the connector to Currey Road.
Detour for Southbound Route 113 on-ramp closure on Westbound I-80
Drivers will continue to travel on Westbound I-80 and take the Pitt School Road Exit and make a left onto Pitt School Road. Then enter Eastbound I-80 on-ramp and then take the Southbound Route 113 off-ramp.
Detour for Southbound Route 113 on-ramp closure on Currey Road
Driver will need to take the Westbound I-80 on-ramp and exit on Pitt school road then take a left on Pitt School Road and enter the Eastbound I-80 on ramp and then take the Southbound Route 113 Exit.