Willow Road/U.S. 101 Interchange

Willow Road - US 101 Interchange
The City of Menlo Park is a project sponsor of the Caltrans project to update the interchange of U.S. 101 at Willow Road. 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.

Current status

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. 

Interchange traffic layout updates

In mid-September, the construction is scheduled to begin the next stage of construction. Traffic will be moved to the outside lanes of the new bridge and demolition of the center existing bridge will begin. In order to make this switch, Willow Road will be completely closed to all traffic for a weekend. That closure is tentatively scheduled for Friday, September 14, 2018, at 10 p.m. until Monday, September 17, 2018, at 4 a.m. Subscribe to the Construction News Updates to keep informed about this closure.

After this closure, the new traffic layout will be in effect.

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
Download larger map
  Map - Willows Traffic Funiture-Phase 1

Current construction activities

For more detailed construction information, please refer to the weekly construction news updates

Dates Times  Impacted area Activity  Traffic impacts
Mid - to late - September Nighttime, hours TBD Existing bridge area Demolition of remaining existing bridge Freeway will be completely closed.  Noise impacts expected in surrounding area
September 14 (10:00pm) - September 17 (4:00am) 24 hours per day
Willow Road and all on- and off-ramps Complete closure of Willow Road to switch traffic to outside of new bridge lanes Complete closure of Willow Road and all on- and off-ramps to all modes of traffic
April - August 2018  7 a.m. to 6 p.m., Monday to Friday Median and both sides of freeway Installation of new bridge structure columns and walls  Periodic freeway lanes closures may occur during non-peak hours 
January - August  2018 8 a.m. to 5 p.m., Monday to Friday Sound walls areas Construction of new sound walls No traffic impacts, but noise  impacts may be experienced by adjacent residential areas
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 
Mid-September 2018 24 hours per day U.S. 101 Ramps and Willow Road intersections Change in ramp layout and added temporary traffic signals New traffic signals will be turned on; Both SB ramps will be on south side; Both NB will be on the north side of Willow Road
Fall 2018 - Spring 2019 24 hours per day Willow Road between Bay Road and Newbridge Street Construction of Willow bridge, no bicycles or pedestrians allowed Bicycle and Pedestrian shuttle provided and Ringwood Avenue pedestrian bridge available as detour. Shuttle map
Last updated on August 13, 2018