Permanent Asti Bridge

What’s Happening?

Sonoma County is working toward building a permanent Asti Bridge to provide reliable, year-round access—especially important during emergencies such as floods or wildfires. The project is estimated to cost $30 million. Property owners may be asked to contribute, depending on grants received and the possible creation of a Bridge Assessment District.

In the meantime, a temporary seasonal bridge continues to provide access, opening each year after June 15 once environmental permits allow. Construction of the temporary bridge takes about two weeks.

How We Got Here

The community has relied on a seasonal temporary bridge for many years. However, growing concerns about emergency access and disaster readiness have made a permanent structure a priority.

Why It Matters

• Provides reliable year-round access, especially during wildfires or floods.
• Strengthens community safety and resiliency.
• Reduces reliance on seasonal temporary crossings.
• Brings long-term certainty for residents, businesses, and emergency responders.

What’s Next

• 2024–2025: Environmental studies completed; Mitigated Negative Declaration adopted.
• 2025:
  
  • Soil drilling for design studies (funded with $300,000 in infrastructure support).
  • Exploring $4 million in funding for bridge design.
  • Ongoing community meetings to review funding options (grants, financing district).
• Formation of a Financing District is expected to be brought to the Board of Supervisors in 2025.

Timeline (recent milestones)

• Dec 2023–Sept 2024: Environmental reviews and adoption of Mitigated Negative Declaration.
• Jan–May 2025: Community events and funding strategy discussions.
• Late 2025 onward: Design and financing decisions; construction timing TBD.

Get Involved

• Community Survey available to gauge support for a Bridge Assessment District.
• Community meetings held regularly; notes and recordings are available.
• Questions? Contact Adriane Garayalde at adriane.garayalde@sonomacounty.gov.