Bay Trail SFO Gap Study

The Bay Trail SFO Gap Study will identify potential Bay Trail alignments to close the three-mile Bay Trail gap around San Francisco International Airport.

David Raboin

The vision for the San Francisco Bay Trail is a continuous, 500-mile trail around San Francisco and San Pablo Bays that serves 47 cities in all nine Bay Area counties.

Today, there is a three-mile gap around San Francisco International Airport (SFO) and an opportunity for a new Bay Trail segment through Millbrae and San Bruno.

The Bay Trail SFO Gap Closure Study will document existing conditions and identify potential new Bay Trail segments near SFO. The study will also recommend a design for a future segment of the Bay Trail to close the gap in this area.

Project Timeline

Date Activity
Spring 2023-Summer 2024 Community and stakeholder engagement

Spring/Summer 2023

Study existing conditions
Summer/Fall/Winter 2023-2024 Conceptual design alternatives and analysis
Spring/Summer 2024 Develop preferred alternative 15% design
Late 2024 Plan document/final study


This project is funded by a $160,000 donation from the John and Gwen Smart Foundation.

Staff Contact

Diane Dohm
Phone: (415) 778-4429
Email: DDohm@bayareametro.gov

Study Area Map

This graphic shows existing portions of the Bay Trail (in green), as well as the area that will be reviewed in the Bay Trail SFO Gap Study (in red).Bay Trail SFO Gap Study area map.

Success Criteria

Many factors will be used to evaluate the proposed Bay Trail connections, such as length and cost, connectivity to destinations, constructability, environmental impacts and equity considerations.

Regardless of the option selected, the preferred alignment must work towards the overarching goals of the Bay Trail:

  • Foster active transportation;
  • Promote healthy communities;
  • Facilitate environmental stewardship and education; and
  • Increase equitable public shoreline access for all Bay Area residents and visitors.
Public Engagement

There will be three phases of public engagement for this project.

Phase 1: Fall 2023

The goal of phase 1 is to better understand how and why people currently walk, bike and roll through the area; identify key destinations in the study area; and identify preferred trail user experience.

Phase 2: Winter 2023-24

The goal of phase 2 is to share and request input on the alternative alignments and design assumptions.

Phase 3: Spring/Summer 2024

The goal of phase 3 is to solicit input on the preferred alternative alignment and design.