The pavement on Sonoma County’s nearly 2,737 lane-miles of streets and roads remains in “poor” condition, with the typical stretch of asphalt requiring major rehabilitation or reconstruction.

Data released today by the Metropolitan Transportation Commission puts the county’s 2012 pavement condition index score at 44 out of a maximum possible 100 points, one point lower than last year. The only two Bay Area locations with worse roads are Larkspur and St. Helena, both with scores of 42.

Sonoma and Windsor are the only two Sonoma County cities with roads in “good” condition, although their condition also has deteriorated over the past three years. Here’s how they rate, with pavement condition score and lane miles of paved road:

Sonoma — Good, 71 (68.2 miles)

Windsor — Good, 70 (173.1 miles)

Rohnert Park — Fair, 68 (207 miles)

Santa Rosa — Fair, 64 (1,093.8 miles)

Sebastopol — Fair, 64 (47.2 miles)

Healdsburg — Fair, 61 (93.2 miles)

Cotati — At-risk, 59 (46.3 miles)

Petaluma — Poor, 49 (389.7 miles)

Sonoma County — Poor, 44 (2,737.2 miles)

Napa County — At-risk, 59 (833.9 miles)

Marin County — At-risk, 55 (845.7 miles)

PCI scores of 90 or higher are considered “excellent.” These are newly built or resurfaced streets that show little or no distress. Pavement with a PCI score in the 80 to 89 range is considered “very good,” and shows only slight or moderate distress, requiring primarily preventive maintenance.

The “good” category ranges from 70 to 79, while streets with PCI scores in the “fair” (60-69) range are becoming worn to the point where rehabilitation may be needed to prevent rapid deterioration. Because major repairs cost five to 10 times more than routine maintenance, these streets are at an especially critical stage.

Roadways with PCI scores of 50 to 59 are deemed “at-risk,” while those with PCI scores of 25 to 49 are considered “poor.” These roads require major rehabilitation or reconstruction. Pavement with a PCI score below 25 is considered “failed.” These roads are difficult to drive on and need reconstruction.

Read Matt Brown’s story about the report and responses from Sonoma County officials here.


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