Grand Ave. & La Puente Rd. Intersection Improvements

Resident Notification

As part of the City's outreach efforts, an informational flyer was mailed to residents in the Snow Creek neighborhood outlining the project scope, schedule, and anticipated impacts. View the notice here(PDF, 409KB).

Project Overview

The City of Walnut will begin construction on the Grand Avenue and La Puente Road Intersection Improvement Project on Monday, October 6, 2025. Work is anticipated to be completed by the end of April 2026 and work hours are Monday - Friday, 7:00 a.m. - 4:00 p.m. This project will upgrade traffic signals, improve drainage, reconstruct sidewalks and curb ramps for ADA compliance, and enhance roadway safety.

As part of the initial work, the existing monument sign and several trees at the southeast corner of Grand Avenue and La Puente Road will be removed to accommodate a new dedicated right-turn lane. Future improvements and beautification of this corner will be incorporated into any future development project at the site; however, no such project has been approved at this time.

Traffic and Access Impacts

• Reduced Speed: The posted speed limit in the work zone will be reduced to 40 MPH for the safety of workers and motorists.

• Lane Closures: At least one lane in each direction will remain open at all times.

• Driveway Access: Maintained at all times unless special arrangements are made.

• Parking Restrictions: Temporary “No Parking” signs will be posted 72 hours in advance in affected areas.

• Pedestrian Access: At least one pedestrian crossing will remain open in both the north–south and east–west directions during construction.

• Transit Service: Bus stops within the work zone may be temporarily relocated.

Lane Closures and Construction Schedule

Traffic control devices will be installed per the approved TCP and CA MUTCD standards.

• Phase 1 (October – December 2025: Drainage & Underground Work)

• Activities: Utility potholing, storm drain installation, curb ramp/sidewalk demolition and reconstruction.

• Right lane closures on Grand Avenue (northbound and southbound) and westbound La Puente Road.

• Bike lanes temporarily closed.

• Traffic control in place during working hours only; all lanes reopen afterward.

• Phase 2 (January – February 2026: Median & Curb Reconstruction)

• Activities: Median reconstruction, curb and gutter installation, ADA ramp upgrades.

• Left lane closures on Grand Avenue (northbound and southbound) and on eastbound/westbound La Puente Road.

• Median work will also restrict turning movements.

• Traffic control in place during working hours only; all lanes reopen afterward.

• Phase 3 (March – April 2026: Final Paving & Striping)

• Activities: Final paving, new striping, installation of traffic signals and detection cameras.

• Multiple lane closures for paving and restriping.

• Expect only one lane open in each direction at times.

• Traffic control devices will remain in place 24/7 for the entire duration of this phase.

Schedule subject to change due to weather or unforeseen conditions.

Safety and Traffic Control

• Work zones marked with cones, barricades, and flashing arrow boards.

• Trenches will be plated or backfilled at the end of each workday.

• Contractor will maintain traffic control devices 24/7 during Phase 3; Phases 1 and 2 devices removed at the end of the day.

• Access to homes and businesses will be maintained.

Contact Information

For questions or concerns during construction, please contact the City of Walnut Public Works Department:
(909) 598-5605 | publicworks@walnutca.gov

We appreciate your patience and cooperation as we complete these important improvements to enhance safety and traffic flow in our community.