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Travel costs associated with flood closures of state highways near Centralia/Chehalis, Washington.
  • Published Date:
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Filetype[PDF-772.03 KB]

  • Publication/ Report Number:
    WA-RD 832.1
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  • Abstract:
    This report discusses the travel costs associated with the closure of roads in the greater

    Centralia/Chehalis, Washington region due to 100-year flood conditions starting on the Chehalis River. The costs

    were computed for roadway closures on I-5, US 12, and SR 6, and are based on estimated road closure durations

    supplied by WSDOT. The computed costs are only those directly related to travel that would otherwise have

    occurred on the roads affected by the flooding closures. The computed costs do not include the economic losses

    associated with delayed delivery of goods or services, losses in economic activity attributable to travelers being

    unable to reach their intended destinations, or economic losses associated with the loss of goods because they

    could not be delivered. The reported costs do include the added costs of time and vehicle mileage associated with

    available detour routes. Costs were also estimated for each trip that will be abandoned. That is, this study

    estimated the number of trips that will not be made as a result of road closures.

    The researchers also conducted a sensitivity analysis of the findings for the I-5 cost computation.

    Sensitivity tests were conducted for the value of time, the speeds and level of congestion assumed to occur on the

    routes used for detours, the values associated with trips that are not made via the expected detours, the

    percentage of personal trips made for work/business purposes versus those being made for personal reasons, the

    fraction of cars and trucks willing to detour, the effects of flood closure during the weekend or the summer, and

    growth in traffic volumes on I-5.

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