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Transportation Final 01-15-11 -   2.1 - State Highway Pavement

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Transportation Final 01-15-11
1. Safety
2. Preservation
3. Mobility
4. Ferries
5. Stewardship
Action Plan

2.1 - State Highway Pavement
What is the condition of pavement on WSDOT-managed roadways?

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Data Notes
Data Source: WSDOT Materials Lab. Data updated March 2010.
Measure Definition: Percent of pavement lane miles by condition category.
Target Rationale:
Link to Agency Strategic Plan: Objective 2.2: Preserve highway pavements at the lowest life cycle cost.

Notes: (optional)



WSDOT is one of a few states to perform its pavement condition survey using an automated pavement condition vehicle on 100% of the surveyed lanes, allowing WSDOT to complete an evaluation of all state highways. WSDOT’s vehicle travels at highway speeds and collects data through the use of high-resolution digital imaging to determine the amount of cracking and patching, pavement roughness and rutting annually on all state highways.

Also Available
Action Plan:


Extended Analysis Yes

 Drill Down Measures

 Summary Analysis

According to the 2008 pavement condition survey, road conditions continued to be good in Washington State. More than 94% of all pavements were rated as good or fair. The percentage of all pavements in poor condition decreased slightly to 5.3% in 2008, compared to 6.7% in 2007. 

  •      WSDOT currently maintains over 18,500 lane miles of state highway pavement consisting of three pavement types: chip seal (Bituminous Surface Treatment), asphalt (either hot mix or warm mix asphalt), and concrete.
  •      WSDOT's pavement management system is one of the best in the nation, called a "model" for other states by FHWA. WSDOT developed an alternative strategy to lowest life-cycle costs in the face of sharp cost increases, reduced revenues, and accelerated deterioration of concrete pavements. 
  •      Hot mix asphalt—nearly two-thirds of WSDOT's roadway network—doubled in price over the last five years, impacting the number of miles WSDOT can overlay. 
  •      Using less-expensive chip seals to resurface HMA roads with lower traffic volumes (less than 5,000 vehicles per day) rather than HMA, WSDOT has minimized the growth of the backlog requiring rehabilitation at one third the equivalent annual cost: $5,000/per lane mile per year vs. $15,000-$20,000/per lane mile per year. 
  •      The concrete backlog has grown, and 60% is past its design life. To meet this long-term backlog, an estimated investment of $1.5 billion over the next 10 years is needed to replace cracked pavement and dowel bar retrofit those that are coming to the end of their regular life-cycle.