Projects in Planning
Sonoma County Public Infrastructure is actively developing road improvement projects that are not yet out to bid but will be in the near future. These projects are in the planning and design phase, where engineers and staff evaluate road conditions, identify needed improvements, and prepare construction documents. Sharing this information helps the public, contractors, and community partners stay informed about upcoming work before it moves into the bidding stage.
Penngrove Intersection Improvements
The County is looking at ways to improve safety at two intersections in Penngrove.
Penngrove Traffic Study
The County completed a traffic study for the Penngrove area to better understand long-standing concerns from residents.
Arnold Drive Bike Lane Project
The Arnold Drive Bike Lane Project will improve safety and create a dedicated transportation corridor between Madrone Road and Country Club Drive.
Chalk Hill Bridge Replacement
Sonoma County is planning to replace the Chalk Hill Road Bridge over Maacama Creek.
Franz Creek Bridge Replacement
Sonoma County plans to replace the one-lane bridge over Franz Creek on Franz Valley School Road.
Freestone Flat Road Bridge Replacement
Sonoma County plans to replace the Freestone Flat Road Bridge over Salmon Creek in southwest Sonoma County.
Geyserville Drainage Project Development
The County is studying Geyserville’s drainage system to understand why flooding happens and to prioritize fixes.
King Ridge Road Bridge Replacement over Austin Creek
Sonoma County plans to replace the one-lane bridge over Austin Creek on King Ridge Road.
Permanent Asti Bridge
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.
Rio Nido Culverts Installation
After the 2019 winter storms caused major flooding and damage, the County launched the Rio Nido Culverts Installation Project.
River Road Bridge Replacement over Gill Creek
Sonoma County will replace the two-lane River Road Bridge over Gill Creek in Geyserville.
Historic Watmaugh Bridge
Sonoma County is evaluating the current condition and future options of the Watmaugh Road Bridge over Sonoma Creek as part of broader roadway and infrastructure planning.
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