Overnight Full Closures of State Route 84 and Shuttle Service for the Arroyo de la Laguna Bridge Project in Unincorporated Sunol

Alameda County - Caltrans continues work on State Route 84 (Niles Cayon Road) as part of the Arroyo de la Laguna Bridge Project; Caltrans will continue construction activities requiring intermittent overnight full closures of State Route 84 (Niles Canyon Road) between Main Street and Pleasanton Sunol Road in Sunol. The closures are scheduled between 8:00 PM to 5:00 AM, Monday to Sunday, for approximately 4 months. For the safety of the crews and travelers, Caltrans will implement full closures while the work is underway. Daytime construction will follow and continue through November. Additional traffic advisories and updates will be sent as the project progresses.

As a result of the Bridge Replacement a daytime shuttle service will be provided beginning June 15, 2026, to allow pedestrians to safely cross the bridge during construction. Details are provided below.

Closure Details

SR-84 between Main Street and Pleasanton Sunol Rd, Sunol
During the nightly closures, motorists will be detoured around the work zone.

All work is weather and schedule dependent.

Project Information

Caltrans is replacing the Arroyo de la Laguna Bridge, which was built in 1939, to ensure a safer and more dependable connection along SR 84.
The new bridge will:

• Provide a wider, safer roadway
• Add ADA-compliant sidewalks
• Improve safety through Niles Canyon and Sunol
• Support better travel between Pleasanton, Sunol, Fremont, and Livermore

Construction of the replacement bridge began in May 2026 with Stage 1 on the north side.

Shuttle Service Information:

Details:

• A shuttle will provide service for cyclist and pedestrians crossing the bridge from the intersection of Main Street/ State Route 84 (Niles Canyon Road) and Pleasanton Sunol Rd / State Route 84 (Niles Canyon Road).
• The shuttle is free of charge for all passengers and can accommodate bicycles.
• The shuttle will operate from 6:00am - 6:00pm, 7 days a week, starting Monday, June 15.
• A single shuttle will be circulating continuously between the pickup and drop-off locations. If you arrive and the shuttle is not present, please call or text 925-419-4609 for assistance.

The map below details the pick-up/drop-off locations for the shuttle:

Detours for motorist:

Drivers traveling toward Main Street (Sunol):

• Turn right onto Main Street
• Turn left onto Kilkare Road
• Turn right onto Foothill Road
• Turn right onto Castlewood Drive
• Turn left onto Pleasanton-Sunol Road
• Turn right to access the I-680 on-ramp

Drivers traveling from Bond Street toward SR-84:

• Turn left onto Main Street
• Turn left onto Kilkare Road
• Turn right onto Foothill Road
• Turn right onto Castlewood Drive
• Turn left onto Pleasanton-Sunol Road
• Enter I-680 using the on-ramp on the right

Drivers traveling from Livermore toward Sunol:

• Take the right connector to I-680
• Stay right to merge
• Exit right at Sunol Blvd
• Turn right onto Sunol Blvd
• Turn right onto Castlewood Drive
• Turn left onto Foothill Road

Drivers traveling from Pleasanton-Sunol Road:

• Continue straight
• Turn right onto Koopman Road
• Turn left onto the I-680 on-ramp
• Exit right at Sunol Blvd
• Turn right onto Sunol Blvd
• Turn right onto Castlewood Drive
• Turn left onto Foothill Road

Drivers heading toward Fremont:

• Take the right connector to I-680
• Stay right to merge
• Exit right at Mission Blvd
• Continue straight on Mission Blvd

Changeable message signs will be activated to guide motorists through the detour.

Caltrans advises motorists to allow extra travel time and use alternative routes when possible. Caltrans will update its Social Media pages with the latest highway conditions. Drivers are encouraged to check out QuickMap http://quickmap.dot.ca.gov/ Motorists can also receive 24/7 highway condition information statewide by calling 1-800-427-ROAD or 1-800-427-7623.

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