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Transportation and Public Works

Projects in Planning

Projects planned for the future by Sonoma County Department of Transportation & Public Works.


Chalk Hill Road Bridge Replacement

The existing bridge that carries Chalk Hill Road over Maacama Creek is a one-lane structure built in 1915. It is a County landmark and is eligible for inclusion on the National Register of Historic Places. The existing bridge has deteriorated significantly and is vulnerable to earthquakes as well as foundation scour and erosion along the south creekbank. The bridge has been determined to be unstable in an earthquake, and is threatened by erosion. The County seeks to replace the bridge with a new two-lane bridge.


Freestone Flat Road Bridge Replacement (C11004)

The Sonoma County Department of Transportation and Public Works (DTPW) proposes to replace the existing Freestone Flat Road Bridge, which is a two-span, steel-girder truss bridge over Salmon Creek, in the southwest portion of the County.


Monte Rio Bridge Replacement

The County is actively working to engage the community regarding a new bridge that reflects local preferences, meets modern constructions standards, and protects the natural beauty of the region.


Permanent Asti Bridge

A Permanent Asti Bridge will provide an additional, reliable, year-round egress, particularly during disaster emergencies, which are an increasingly frequent threat. The total estimated project cost is $20 million, and the County proposes to fund $16 million. Property owners may be required to fund up to $4 million of project costs, dependent on any grant moneys that may be available,


River Road Bridge Replacement over Gill Creek

Sonoma County is currently working towards replacing the two-lane bridge over Gill Creek, on River Road, Geyserville. The bridge requires replacement due to scour deficiencies and seismic deficiencies.