Willow Road/U.S. 101 Interchange

Willow Road - US 101 Interchange

Interchange layout

The construction will enter into the final stage the weekend of April 5, 2019 (weather permitting) and the vehicle lanes will be shifted into the middle portion of the bridge. The final traffic signals will be implemented and the construction team will complete the improvements to the sidewalks, bike lanes, fencing, signing, striping and street lighting.  The lane configuration will remain the same with two through lanes and one right turn only lane in each direction of Willow Road. The lanes on the freeway ramps will also remain the same and movements to and from the freeway ramps will remain the same.

Project description


The City of Menlo Park is a project sponsor of the Caltrans project to update the interchange of U.S. 101 at Willow Road. This project was awarded to a contractor in February 2017 and construction began in May 2017 and is expected to continue for approximately 2 years. The current "full cloverleaf" style interchange will be replaced with a "partial cloverleaf" which will eliminate the short merge weaves both on Willow Road and on the freeway and will create a more efficient way for all modes of traffic, including bikes and pedestrians, to get across the freeway at Willow Road. The project will replace the existing interchange with a new, wider bridge; add sidewalks on both sides, bike lanes on both sides and protected bike paths on both sides; and add two signalized intersections. The final version of the new interchange layout is available for review.

Willows Neighborhood traffic changes 


To help alleviate additional congestion experienced in the neighborhoods, the following temporary turn restrictions were implemented in December 2017:
  • No right turns from Chester Street, Durham Street and O’Keefe Street to
    Willow Road, 3-7 p.m. weekdays (Except SamTrans and school buses)
  • No left turns from Woodland Avenue to Baywood Avenue, 3-7 p.m. weekdays

Current construction activities


For detailed construction information, review the weekly construction news updates.

Dates Times  Impacted area Activity  Traffic impacts
April 4 - April 6, 2019 10 p.m. - 8 a.m, Friday to Sunday Willow Road at both ramp intersections Traffic switch, turn on new traffic signals, re-stripe lanes through intersection Lanes on Willow Road may be closed during non-peak hours. Ramps to and from 101 may be closed and detours in place. Pedestrians will be prohibited during this period and pedestrian access will be reopened upon completion of the traffic switch
December 18, 2017 through TBD 3-7 p.m., Monday to Friday Chester Street, Durham Street and O'Keefe Streets at Willow Road No right turns Right turns will be restricted every weekday from 3-7 p.m. for all vehicles
December 18, 2017 through TBD 3-7 p.m., Monday to Friday Woodland Avenue to Baywood Avenue No left turns Left turns will be restricted every weekday from 3-7 p.m. for all vehicles 
October 10, 2018 - Spring 2019 24 hours per day Willow Road pedestrian access across 101.  One sidewalk will be open on one side of the bridge at all times
Sidewalk on the north side of the bridge will be open for pedestrians and to walk bicycles across the bridge. During construction of the north side final sidewalk and bike lanes, sidewalk on the south side will be open for pedestrians and to walk bicycles across the bridge The shuttle service has been discontinued. Pedestrians should follow signs to the pedestrian access across the bridge
Last updated on March 28, 2018