I-10 Mount Vernon Avenue Improvements

Project Google Map - click for live closures and detours.

Planning
Environmental
Design
Construction
Completion

The San Bernardino County Transportation Authority (SBCTA), California Department of Transportation (Caltrans), and the City of Colton have partnered to improve Mt. Vernon Avenue over Interstate 10 (I-10). The project will enhance circulation and mobility along Mount Vernon Avenue between East Valley Boulevard to the north and the I-10 eastbound ramps/Mt. Vernon Avenue intersection to the south.

Improvements include replacing and widening the existing Mt. Vernon Avenue bridge over I-10, upgrading roadway and intersection operations, and enhancing bicycle and pedestrian facilities through the interchange. The project will also provide Americans with Disabilities Act (ADA) compliant curb ramps, crossing activators, and tactile warning surfaces at intersections where crosswalks are included.

These upgrades will help reduce local congestion, improve safety for all users, and support future transportation improvements in the corridor, including planned I-10 Express Lanes.

Construction is anticipated to begin in May 2026.

Over the coming weeks, the contractor will prepare the work area for the start of construction. These preparations may include installing construction area signage and temporary concrete barriers known as k-rail, adding temporary striping on Mt. Vernon Avenue south of the I-10 freeway bridge, and vegetation removal. Intermittent closures within the project limits may be needed to facilitate these activities.

Construction work will generally take place Monday through Friday during daytime hours (7:00 a.m. to 4:00 p.m.) and nighttime hours (8:00 p.m. to 5:00 a.m.). Motorists are advised to reduce speeds, follow all posted signage, and use caution when traveling through the work zone. Please check the Google Map for the most up-to-date closure information.