Interchange Transformation at Interstate 80 and Gilman Street Now Complete
Berkeley – Motorists, bicyclists, and pedestrians will experience safer and more efficient travel in one of the city’s most congested corridors, now that a $100 million project to transform the Gilman Street interchange on Interstate 80 is finished.
After a two-phase buildout, the project includes modern roundabouts on both sides of the interstate, a bicycle and pedestrian overcrossing above the freeway, a new street-level bicycle/pedestrian pathway through the interchange and a new connection to the Bay Trail, which closed the gap between Berkeley and Albany.
"The I-80-Gilman Interchange improvement project is exactly the kind of effort Alameda County voters envisioned when they approved Measure BB to fund local transportation projects," Remarked Board of Supervisors President and Chair of the Alameda County Transportation Commission, David Haubert. “Our efforts are already delivering a safer, more streamlined interchange that supports all travelers. With the improvements we are celebrating today, this interchange will make mobility safer, reduce congestion, and improve access to the waterfront and the Bay Trail.”
“This comprehensive project is a prime example of how reimagined transportation infrastructure can better serve all Californians, regardless of their travel mode of choice,” said Caltrans District 4 Director Dina El-Tawansy. “Innovative design, strong collaboration and community input worked in concert to deliver a passage that is safer, more efficient and better connected to the neighborhoods it serves.”
Representatives from Caltrans, Alameda County, the City of Berkeley and local transportation agencies formally announced the interchange opening, today during an 11 a.m. ceremony on Gilman Street in Berkeley.
The $100 million project was funded through a combination of local, state and federal sources. Senate Bill (SB) 1, the Road Repair and Accountability Act of 2017, contributed $4.1 million and federal programs added $3.1 million. Meanwhile, $53.8 million in funding came from the State Transportation Improvement Program (STIP), $34.3 million from local voter-approved Measure BB and nearly $5 million from local and regional partners such as the City of Berkeley, East Bay MUD and the Bay Area Air District. Caltrans led the development effort, with input from the Alameda County Transportation Commission in partnership with the cities of Berkeley and Albany.
The I-80/Gilman interchange provides critical access to local businesses, parks and other destinations, and is a vital link for regional bike and pedestrian networks. The improvements reflect broad input from residents, businesses and advocacy groups, and demonstrates the region’s commitment to multimodal travel and sustainability. The upgrades address long-standing concerns at the interchange, previously known for complicated intersections and limited access for people who walk and bike, by delivering infrastructure that prioritizes safety and accessibility for all users.
SB 1 provides $5 billion in transportation funding annually split between the state and local agencies. Road projects progress through construction phases more quickly based on the availability of SB 1 funds, including projects that are partially funded by SB 1.
Visit build.ca.gov to learn more about transformative infrastructure projects happening in communities throughout the state. For more information about I-80/Gilman Interchange Project, visit: https://www.alamedactc.org/programs-projects/highway-improvement/i80gilman
For 24/7 traffic updates, please visit 511.org: https://x.com/511SFBay
For real-time information, visit Caltrans QuickMap: https://quickmap.dot.ca.gov
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Or call 1-800-472-7623, 1-800-427-ROAD for state highway conditions statewide.
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