Periodically Public Infrastructure (formerly Department of Transportation and Public Works) hires a consultant to assess the conditions of Sonoma County’s 1,349 miles of paved roads (the county also has 17 miles of gravel roads). The current version of this information can be found in Harris & Associates “2022 Pavement Management Program Update.”

The report contains a wealth of information on Pavement Condition Index (PCI), which is a measure of road condition. It uses a scale from 1 to 100, with 100 being perfect. Below 50 the condition of a road is classified as "poor" and below 25 a road is classified as being in "very poor" condition.


Overall county roads in 2022 have a Pavement Condition Index of 53, an improvement from 52 the previous year.  The major collectors and arterials are in the best condition, ranging between 69 and 78 and classified as very good. Local roads account for almost two-thirds of the county road system and have a PCI of 42. Many are in very bad shape, with 17 percent being ranked as poor and 25% ranked as very poor.


Appendix I (PDF pages 27-90) contains the current Pavement Condition Index for each road section of Sonoma County, listed alphabetically.

The county has made considerable progress in recent years, but still has a long way to go.