The purpose of the Sonoma State Route (SR) 1 Culvert Rehabilitation Project (Project) is to restore, improve, and upgrade the three culverts to reduce the potential for highway flooding and damage within the Project area. The Project is needed because maintenance surveys determined that the culverts have exceeded their service life and exhibit structural deficiency due to corrosion, deformation, and/or abrasion. If not addressed, these conditions could lead to insufficient drainage across SR 1 in the Project area, threatening future use of the highway. 

SR 1 is an important coastal connector for local residents and businesses in unincorporated Sonoma County and the only connecting road for several coastal communities. The loss of hydraulic capacity would affect access to these rural areas for the traveling public including emergency service providers.