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Arroyo De La Laguna Bridge Project

Project Information

Caltrans is currently replacing the Arroyo de la Laguna Bridge (Bridge No. 33-0043) on State Route 84 (Niles Canyon Road) in Sunol, Alameda County.

To protect creek resources, no work is allowed within the bed or banks of Arroyo de la Laguna Creek between October 16 and May 30 of each year. Construction of the new bridge will be completed in three stages over three construction seasons.The existing bridge, built in 1939, is being replaced to address scour and seismic concerns, improve safety, and meet current design standards. Construction began in May 2026 and is currently underway.

The new bridge will provide:

  • A wider and safer roadway
  • ADA-compliant pedestrian facilities
  • Improved bicycle access
  • Enhanced safety for travelers through Sunol and Niles Canyon
  • Improved connectivity between Pleasanton, Sunol, Fremont, and Livermore

Overhead view of Arroyo de la Laguna Bridge on State Route 84 (Niles Canyon Road) in Alameda County.

Current Construction Activities

Construction is currently underway on Stage 1 of the bridge replacement project on the north side of the existing bridge.

To support construction activities, Caltrans is implementing intermittent overnight full closures of State Route 84 (Niles Canyon Road) between Main Street and Pleasanton-Sunol Road in Sunol.

Map showing the closure of State Route 84 between the Sunol Road Exit and Pleasanton-Sunol Road near Sunol in Alameda County.Overnight Closures

  • Hours: 8:00 p.m. to 5:00 a.m.
  • Days: Monday through Sunday
  • Duration: Approximately four months
  • Location: SR 84 between Main Street and Pleasanton-Sunol Road

Motorists will be detoured around the work zone during overnight closures.

Following the overnight closure period, daytime construction activities will continue through November 2026.

All work is weather- and schedule-dependent.

Current Advisories

Aerial view of Arroyo de la Laguna Bridge on State Route 84 in Alameda County near the intersection with Pleasanton-Sunol Road.

Shuttle Service for Pedestrians and Cyclists

Beginning June 15, 2026, Caltrans is providing a free daytime shuttle service to allow pedestrians and bicyclists to safely cross the bridge during construction.

Shuttle Service Details

  • Service Hours: 6:00 a.m. to 6:00 p.m.
  • Days of Operation: Seven days a week
  • Cost: Free
  • Bicycle Access: Bicycles are accommodated

The shuttle operates continuously between pickup and drop-off locations near:

  • Main Street and SR 84 (Niles Canyon Road)
  • Pleasanton-Sunol Road and SR 84 (Niles Canyon Road)

If the shuttle is not present, users may call or text 925-419-4609 for assistance.

Map showing the pick-up/drop-off location for the shuttle provided for pedestrians and cyclists during the Arroyo de la Laguna Bridge Project. The pick-up/drop-off zone on the western side of the project is in the Northeast corner of the intersection of SR-84 and Main Street. The pick-up/drop-off zone on the eastern side of the project is in the Northeast corner of the intersection of SR-84 and Pleasanton Sunol Road.

Project Description

The project will replace the existing six-span reinforced concrete T-beam bridge with a new three-span structure and realign the roadway.

The new bridge will include:

  • Two 13-foot-wide travel lanes
  • A 2-foot-wide median
  • 9-foot-wide shoulders with see-through barrier railings
  • A 17-foot-wide shared-use path for pedestrians and bicyclists on the south side of the bridge

Project News and Updates

Stay informed and sign up here or click on the form below to get news and updates about the Arroyo De La Laguna Bridge Project

Screenshot of the Constant Contact sign-up form for email updates about the Arroyo de la Laguna Bridge project.

Link to Final Environmental Document (FED)