Periodically Public Infrastructure hires a consultant to assess the condition of Sonoma County’s 1,349 miles of paved roads (the County also has 18 miles of gravel roads). The most current information can be found in Harris & Associates “2024-25 Pavement Management Program Update.” [link]
The 930-page report contains a wealth of information on Pavement Condition Index (PCI), which is the standard 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 being in "poor" condition and below 25 a road is classified as being in "very poor" condition.
Overall County roads in 2024-25 had a Pavement Condition Index of 53, identical to the year 2022. The major collectors and arterials are in the best condition, ranging between 68 and 74 and classified as very good. Local roads account for almost two-thirds of the county road system and have a Pavement Condition Index of 44, an improvement of two points since 2022. Many local roads remain in bad shape, with 11 percent being ranked as poor and 23% ranked as very poor (Table 5). The report suggests that under current budgets it will be a challenge to maintain a Pavement Condition Index of 53, and a significant increase is needed to boost the Pavement Condition Index to 58 (p. 10).
Appendix I (90 pages) contains the current Pavement Condition Index for each road section of Sonoma County, listed alphabetically. Appendix III (725 pages) provides information about the condition of each road section in Sonoma County.
Sonoma County has made considerable progress since SOSroads began in 2011, but clearly still has a long way to go.