State Route 1 Pilarcitos Creek Bridge Project in Half Moon Bay
Project Information
The Pilarcitos Creek Bridge on State Route 1 near State Route 92 in Half Moon Bay has been identified as a "scour critical bridge" which requires installation of additional protection for the foundation. Erosion around its supports —known as scour—poses a risk to the structure’s long-term stability, particularly during high-flow events such as floods. Caltrans has initiated a project to restore and protect the bridge.
Construction will require intermittent closures of the right-hand turn ramp from northbound SR-1 to eastbound SR-92. During the construction phase, the bike/pedestrian path running under SR-1 from San Mateo Road to SR-92 will be closed.
Bicycle and Pedestrian Path Detour
Caltrans will close the right-hand turn ramp from northbound SR-1 onto eastbound SR-92 in Half Moon Bay starting on July 7, 2025. Motorists and cyclists may access SR-92 by turning right at the traffic signals. Cyclists and pedestrians using the path are advised to follow the posted detour and take crosswalks across SR-1 to connect back to the path, approximately 500 yards east of the SR-1 – SR-92 intersection.
Project Schedule
The project will run from summer 2025 through fall 2026. Most construction activities will take place between June and October 2025.
Hours of construction:
Weekdays: 7:00 a.m. to 6:00 p.m.
Saturdays: 8:00 a.m. to 6:00 p.m.
Sundays and holidays 10:00 a.m. to 6:00 p.m.
What is Scour?
Scour is a process in which rapidly flowing water strikes a bridge column resulting in whirlpools that erode the sediment supporting the bridge column, which can compromise the strength of the bridge.
Project Contact
Jeneane Crawford
Public Information Officer - Caltrans District 4
Cell: 510.390.3253
Email: Jeneane.Crawford@dot.ca.gov