Sonoma County is geographically large – almost 1,800 square miles – with an extensive system of streets and roads. Although much of the population is clustered within the incorporated cities and along the Highway 101 corridor, 30% of the population lives scattered throughout the County.

There are over 2,300 lane miles of city streets and county roads in Sonoma County. The full cost to rehabilitate and maintain in good condition this vast infrastructure is over $2 billion.

Federal gas tax funds provide some of the only consistent sources of money to pay for road maintenance. SCTA continues to support and encourage the approach of developing “shovel-ready” projects that can use any funding that might become available.

STP Projects

Cotati Old Redwood Highway S. $250,000
Healdsburg Rehab various Street and Roads $250,000
Petaluma Complete Streets $1,609,000
Rohnert Park Rehab various Street and Roads $1,103,000
Sebastopol Rehab various Street and Roads $249,392
Sonoma Rehab various Street and Roads $250,000
Safe Routes to Schools Programs Countywide $1,379,000



All of the cities and the County track their pavement condition so they know what roads need what type of improvement. This is called the Pavement Condition Index and it is updated annually. To find out the condition of a road you drive see the MTC website.

The County of Sonoma has made repairing roads in the unincorporated county a top priority and they have a plan in place to show residents what they hope to achieve. The 2014 Long Term Road Plan provides details on every part of the County and what roads will be the focus of improvement.