There are over 600 bridges in all of Sonoma County. Over half of them – 327 – are on county-maintained roads, in the unincorporated area outside of city limits. Transportation and Public Works maintains and operates all 327 bridges, more than any other County in the Bay Area by almost 200 bridges.
These bridges are an important part of the Sonoma County transportation system. Every day, over 800,000 trips on average are made over these bridges. In California, all designated bridge structures are inspected by Caltrans, the state transportation agency, on a two-year cycle. A bridge inspection examines the structural integrity of each bridge, and is coupled with ongoing staff inspections to form the basis for the County’s bridge replacement, repair, rehabilitation, and maintenance program.
Fun Fact: The oldest bridge in Sonoma County is the O’Donnell Lane Bridge over Calabazas Creek in Glen Ellen (pictured), constructed in 1900. The primary mode of transportation at this time was a horse and buggy. It was not until 1903 that Henry Ford invented the Ford Model T.