Road closures are posted here (but this does not include closures in city limits): https://roadclosures-sonomacounty.hub.arcgis.com/
You can follow the progress of roadwork projects at these links
https://www.facebook.com/SonomaCoPI
https://sonomacounty.gov/development-services/sonoma-public-infrastructure/roads-projects-and-services/road-closures
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