Alameda County — Caltrans will begin the first phase of construction on the Oakland Alameda Access Project (OAAP) starting Monday, March 2, 2026.
The first week will consist of preparation and staging work only. This includes installation of construction signage, detour and wayfinding signs, temporary striping configurations, establishing work zones, and placement of K-rail along the right side of Oak Street.
Traffic impacts will be limited during this early setup period. Full construction activities impacting traffic will begin after staging is complete, and a separate updated advisory will be issued in advance of those impacts.
All work is weather dependent and subject to change.
*Highlighted in orange, the map shows anticipated work locations and parking restrictions in Oakland for 2026.
What to Expect During Week of March 2
Installation of construction signage
Detour and wayfinding signs
Temporary roadway striping
Establishment of work zones
Limited traffic impacts during staging
Placement of K-rail along Oak Street
Saw-cutting activities are expected to begin on Oak Street later in the week following initial staging work
More significant traffic impacts will begin after staging work. Additional advisories will be issued.
The initial set of work activities will occur at the following locations:
Northbound I-880 Oak Street Off-Ramp
Right-Turn Lane Closure – Preparation Work Beginning March 2
Closure:Right-turn lane only on the NB I-880 Oak Street off-ramp
Long term closure of the Right Turn Lane
Beginning: March 2, 2026
Traffic Control:
Left-turn lane remains open
Middle lane remains open (through / left-turn movement)
Right-turn lane only is closed
Work Includes: Outside widening of the off-ramp
Motorists should expect delays approaching the ramp and follow posted signage.
Upcoming Traffic Impact:
Monday, March 2nd, Shoulder closure from 4:00 PM to 8:00 PM
NB Oak Street Off Ramp Full Closure will occur nightly
starting Monday Night, March 2nd to Friday, March 6th from
7:00 PM to 8:00 AM
to install temporary stripping, K-rail and signage.
Oak Street Improvements (East Side)
Preparation work begins March 2, 2026; K-rail will be installed on the east side of Oak Street.
Location: Oak Street between 3rd Street to 9th Street
Impacts: Lane reductions and temporary parking restrictions on the east side of Oak Street
Work Includes:
Roadway and corridor improvements
Sidewalk and curb ramp improvements (East side)
Temporary pedestrian path/ADA accommodations
Parking Restriction
Upcoming Traffic Impact:
Installation of temporary pedestrian barriers (K-rail and water barriers)
scheduled for Tuesday, March 3rd to Friday, March 6th
between 7:00 AM to 4:00 PM
Parking Notices will be placed 72 hours prior to the start of the work
Jackson Street / 5th Street Improvements
Preparation work begins March 2, 2026
Location: Jackson Street at 5th Street
Impacts: Lane shifts and intermittent closures
Work Includes:
Intersection and circulation improvements
Sidewalk and curb ramp improvements at the southwest corner
Temporary pedestrian path during construction
5th Street Corridor Improvements
Preparation work begins March 2, 2026
Location: between Alice Street and Harrison Street
Impacts: Localized traffic control and lane reductions
Work Includes:
Pavement and roadway improvements
Sidewalk and curb ramp improvements between Harrison Street and Alice Street
Temporary striping and pedestrian adjustments
Harrison Street Improvements
Preparation work begins March 2, 2026
Location: between 4th street and 5th street ( East Side)
Impacts: Temporary lane reductions
Work Includes:
Roadway and safety enhancements
Sidewalk and curb ramp improvements between 4th Street and 5th Street (East side)
Temporary pedestrian path during construction
Mariner Square Loop Improvements (City of Alameda)
Preparation work begins March 2, 2026
Location: Mariner Square Loop
Impacts: Intermittent lane closures and traffic control
Work Includes:
Roadway and circulation improvements
Sidewalk and curb ramp improvements between Webster Street and Willie Stargell Avenue
Webster Tube Walkway Improvements
Construction Beginning First Week of April 2026
Anticipated Start: April 1, 2026
Schedule: Sundays to Thursday Nights from 10:00 PM – 5:00 AM
Duration: 6 months
Impacts: Pedestrian detours and lane restrictions
A separate traffic advisory will be issued once final closure schedules and traffic control details are confirmed.
Stay Tuned for Updates
The OAAP will be constructed in phases, and traffic impacts will evolve as work progresses. Detailed closure schedules, detour maps, and additional information will be issued before major traffic changes begin.
For ongoing updates:
For real-time traffic information and detours, visit Caltrans QuickMap or 511.org.
Drivers are encouraged to check out Caltrans Quickmap https://quickmap.dot.ca.gov/
Motorists can also receive 24/7 highway condition information statewide bycalling 1-800-427-ROAD or 1-800-427-7623.
Caltrans thanks the public for their patience and cooperation as we continue to improve California’s transportation network.
Be Work Zone Alert and expect travel delays.