US 101/Peninsula Avenue Interchange Project

Current News

The California Department of Transportation (Caltrans) has initiated a public review period and is conducting a virtual scoping meeting to request comments on the scope and content of a planned Environmental Impact Report/Environmental Assessment (EIR/EA) for the proposed U.S. Highway 101/Peninsula Avenue Interchange Project in San Mateo County.

 Caltrans has issued a California Environmental Quality Act (CEQA) Notice of Preparation (NOP) with the State Clearinghouse. The NOP contains information about the project scope and planned environmental studies. 

 Submit your comments by 5 p.m. on or before May 24, 2021 to:

Caltrans District 4 

Attn: Tanvi Gupta

P.O. Box 23660 MS 8B 

Oakland, CA 94623-0660

or via email to


Caltrans will host a virtual scoping meeting on Wednesday, April 28, 2021 at 6 p.m. 

Project team members will be available to clarify basic information about the project and the process for submitting comments. All scoping comments must be submitted in writing by email or mail. Attendance at the virtual scoping meeting is not required to a submit comment.

Caltrans organizará una reunión virtual de alcance el miércoles 28 de abril del 2021 a las 6 p.m.

Miembros del equipo del proyecto estarán disponibles paraaclarar información sobre el proyecto y el proceso para enviarcomentarios. Todos los comentarios de alcance deben presentarse porescrito por correo electrónico o por correo. No se requiere la asistencia a la reunión virtual de alcance paraenviar comentarios.

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This meeting will be presented in English and Spanish. Este encuentro se presentará en inglés y español. Registration is not required. No es necesario registrarse.

To request additional assistance in attending the meeting or obtaining a copy of the NOP, please contact: Tanvi Gupta, Caltrans District 4, (510) 421-8378. Para solicitar asistencia adicional para asistir a la reunión uobtener una copia del NOP, póngase en contacto con: TanviGupta, Caltrans District 4, (510) 421-8378.

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.  When Caltrans issued the NOP, the project entered the public scoping period. Please provide your comments about the project to Caltrans.  

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).
  • End of 2021/Early 2022 – Complete draft environmental document (receive formal public comments).
  • Fall 2022 – 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.