I-80 Gilman Interchange Improvement Project
Overview
Caltrans and the Alameda County Transportation Commission (Alameda CTC) in cooperation with the cities of Berkeley and Albany began construction in May 2021 on the Gilman Interchange Improvement Project at the Interstate 80 Gilman Street exit in Berkeley.
The project will enhance safety and improve traffic operations along Gilman Street between West Frontage Road and 5th Street through the I-80 Interchange. The main project components are two roundabouts at Gilman Street intersections on both sides of I-80, as well as a new bicycle/pedestrian overcrossing over I-80 and bicycle facilities at and near the interchange. The project will also close the gap in the Bay Trail at the west end of Gilman Street and create a dedicated two-way cycle track along Gilman Street from the interchange to Fourth Street.
Project Purpose
- Simplify and improve navigation, mobility, and traffic operations on Gilman Street between the West Frontage Road and 5th Street through the I-80 interchange
- Reduce congestion, vehicle queues, and traffic, bicycle, and pedestrian conflicts
- Improve local and regional bicycle and pedestrian facilities through the I-80/Gilman Street interchange
- Enhance safety for drivers, pedestrians, and bicyclists at I-80/Gilman Street interchange
The Gilman Street Interchange Project is being constructed in two separate construction contracts:
1. Gilman Street Pedestrian Overcrossing Project – Phase 1
Project Scope
Construct a bicycle/pedestrian overcrossing south of Gilman Street similar to the crossing over I-80 at University Avenue, began in May 2021. It will involve ramp closures on I-80, street closures and brief overnight closures of I-80 in one direction at a time. Work on this phase was concluded in 2023.
2. Gilman Street Roundabouts Project – Phase 2
Project Scope
The second phase, building a double roundabout, is scheduled to begin in July 2022 and complete in 2024, weather permitting. Periodic closures of Gilman Street, local streets and freeway ramps will be necessary to construct the project. Work on this phase is expected to conclude in 2024.
Available Documents
Environmental Document:
Initial Study with Negative Declaration / Environmental Assessment with Finding of No Significant Impact
Traffic Advisories
- Temporary Nighttime Closures for Paving for the I-80/Gilman Street Interchange Project Final Paving Scheduled the Week of November 19, 2024
- Temporary Closures of Gilman Street at I-80 Gilman Interchange in Berkeley September 3rd and September 4th, 2024
- Traffic Switch at I-80 Gilman Street Interchange in Berkeley August 5, 2024
- Traffic Switch at I-80 Gilman Street Interchange in Berkeley July 10, 2024
- Update: Gilman Street to Close Between Second and Fourth Streets in Berkeley Mid- to Late April through Mid- to Late June 2023
- 12-Hour Overnight Closure of Gilman Street at the I-80 Gilman Interchange in Berkeley November 11-12, 2022
Links
Alameda County Transportation Commission – Gilman St Interchange Improvement Project Page
Contact
For additional information, contact Public Information Officer Hector Chinchilla at Hector.Chinchilla@dot.ca.gov.