• TPW Quarterly Newsletter Pavement Edition Web

2016 Pavement Edition Newsletter

Road Fundamentals

Five Year Mile Totals

Sonoma County uses two complementary approaches to keep our roads drivable: corrective maintenance (patching potholes, clearing culverts, vegetation management, and more), and Pavement Preservation. 

Pavement Preservation is a network level, long-term strategy that uses cost-effective road treatments to extend pavement life. Treatments include rebuilding roads, laying new road surfaces, and preserving existing surfaces. 

2016 Pavement Preservation

Irwin Lane 2016 FDRThis year we are re-surfacing over 75 miles of roads. We are working with contractors to: rebuild 11.64 miles using Full Depth Reclamation (FDR), pave 7.85 miles with an asphalt overlay, resurface 11.77 miles with a Bonded Wearing Course, and preserve 9.95 miles with a chip seal. Additionally, our in-house Road Maintenance professionals chip sealed over 33 miles of roads.

To see what roads are currently under construction, and a full list of this summer’s work

2016 is the second year of a two-year Pavement Preservation Program, which totaled about 95 miles, and was funded with $22.4 Million in local, General Fund money.

Road Selection

Bloomfield 2016 Overlay

A list of roads is developed every year, to be resurfaced during the following year. The selection process takes multiple criteria into consideration, including pavement condition, type and amount of usage, design characteristics, as well as geographic distribution of projects. To learn more about these criteria please visit http://sonomacounty.ca.gov/TPW/Project-Selection/.  

The Right Treatment

Madrone 2016 Chip SealPavement Preservation is a multi-faceted approach that includes preserving roads that are in relatively good condition and improving roads that are in poor condition. We apply lower-cost preservation treatments such as Chip Seal to the roads in good condition, while dedicating funds to roads that are in need of more comprehensive treatments, such as a Full Depth Reclamation. 

Full Depth Reclamation (FDR)

  • Involves: pulverizing the existing pavement, mixing in cement, compacting the road base, and paving a new asphalt surface.
  • Used on: roads that have reached the end of their lifespan and have minimal or failing roadway sections.
  • 2016 Examples: Irwin Lane, Watmaugh Road (pictured above) 


  • Involves: making surface and small, localized road base repairs, and paving a new asphalt road surface.
  • Used on: roads that are in need of surface repairs and increased road structural stability.
  • 2016 Examples: Bloomfield Road, Lynch Road 

Bonded Wearing Course

  • Involves: making road surface and minor road base repairs and paving a new high-performance surface asphalt coat to seal the surface of the road.
  • Used on: roads that have sound structural sections, but are beginning to crack (cracking allows water to flow under the pavement, causing significant damage).
  • 2016 Examples: Sebastopol Road, Santa Rosa Avenue, Bodega Avenue 

Chip Seal

  • Involves: making surface and minor road base repairs, spraying liquid asphalt on the road, and then spreading and compacting fine gravel into the asphalt - watch a short time-lapse!
  • Used On: roads that have relatively strong foundations and surface integrity, but the surfaces are losing the oil that keeps the road from cracking.
  • 2016 Examples: Chalk Hill Road, Skillman Lane 

Ongoing Funding for Pavement Preservation

Five Year Funding TotalsWhen the state gas tax was enacted in 1923, there was enough money to cover both corrective maintenance and Pavement Preservation. However, due to stagnant state and federal funding, a 500% increase in the price of asphalt (asphalt is a mix of oil and gravel), and more cars using less gallons, state gas tax only covers a portion of Sonoma County’s corrective maintenance, and leaves no funding for Pavement Preservation. 

The Board of Supervisors (Board) recognizes that our infrastructure is an important investment, and has increased the amount of funds dedicated towards Pavement Preservation over the last few years. In 2015 the Board created an ongoing annual allotment of $11.5 Million for Pavement Preservation in the County budget. 

This is more General Fund money for Pavement Preservation than any other County in California.

2017 Paving and Funding

In addition to the annual commitment of $11.5 million to roads, in 2015 the Board dedicated $13.5 Million in one-time funds to resurfacing roads. The majority of this funding will be combined with the annual $11.5 Million allotment for almost 100 miles of roads in 2017. 

Contact Information

Johannes J. Hoevertsz


Transportation & Public Works
Business Hours
Monday – Friday
8:00 AM – 5:00 PM
Contact us by Phone
Office Location
La Plaza B
2300 County Center Drive
Suite B 100
Santa Rosa, CA 95403
38.462006, -122.725384