US 101/Peninsula Avenue Interchange Project

Current News

The environmental studies phase started in April 2021 and is anticipated to be complete in Summer 2023. 

In late 2021, we were awarded a grant from the San Mateo County Transportation Authority to complete the next phases of work – Design (Plans, Specifications, and Estimate) and Right-of-Way Administration. This grant funding is pending completion of the current environmental studies phase. Funding has not yet been identified for property acquisition.

Project Description

We are proposing to relocate the existing U.S. Hwy 101 southbound on- and off-ramps from East Poplar Avenue to Peninsula Avenue in order to create a single, full-access interchange at Peninsula Avenue and Airport Boulevard. This would improve safety and traffic operations as well as reduce most typical travel times within the Peninsula Avenue interchange area for residents of both San Mateo and Burlingame. The project would also provide bicycle and pedestrian improvements on Peninsula Avenue from just west of North Humboldt Street to North Bayshore Boulevard.

Project Timeline

  • January 2021 – Meetings with property/business owners and the community.
  • April 2021 – Begin environmental studies phase and hold project scoping meeting (receive formal public comments).
  • Early 2023 – Complete draft environmental document (receive formal public comments).
  • Summer/Fall 2023 – Finalize environmental document and determine next steps for project.
  • Potential next steps include right-of-way acquisition and project design. These cannot begin prior to completion of the environmental document and project approval.

2021 Scoping Documents


Right-of-Way Brochures


Related Documents