Two-rail steel-backed timber guardrail system : Crown Point Highway, Multnomah County, Oregon : final report.
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ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners. As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.
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Two-rail steel-backed timber guardrail system : Crown Point Highway, Multnomah County, Oregon : final report.

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English
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  • Alternative Title:
    Two-rail steel-backed timber guardrail system : Crown Point Highway : final report.
  • Creators:
    Peters, Wendy
  • Corporate Creators:
    Oregon. Dept. of Transportation. Research Unit
  • Corporate Contributors:
    United States. Federal Highway Administration
  • Subject/TRT Terms:
  • Publication/ Report Number:
    Oregon Experimental Feature Project #OR92-03
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Oregon
  • Corporate Publisher:
    Oregon. Dept. of Transportation. Research Unit
  • Abstract:
    In 1920, to provide for the safety of drivers on the Columbia River Highway, two-rail timber guardrail were installed. Subsequently, the two-rail timber guardrail were replaced by more modern guardrail. Recently, the Historic Columbia River Highway Advisory Committee requested that the Oregon Department of Transportation (ODOT) install the old style two-rail guardrail by reinforcing the rails with galvanized steel. The two-rail steel-backed timber guardrail was successfully crash tested and installed on the HCRH.

    In March 1992, the guardrail was installed using Douglas-fir for the posts and rails and galvanized steel as backing for the rails. The guardrail was installed with few delays, although it was more time consuming than standard guardrail installation. The cost to install the two-rail steel-backed timber guardrail was $134.50/meter ($41.00/foot), which is about 3-1/2 times more costly than the typical Type 2A guardrail. The wood was pressure treated with ammoniacal copper zinc arsenate (ACZA), which leached out, discoloring the paint and corroding the galvanized steel.

    ODOT Research Unit staff evaluated the two-rail steel-backed timber guardrail for two years as part of an Experimental Features research project. Recommendations from this include: 1) pressure wash, seal and repaint the existing guardrail, 2) continue the evaluation of the guardrail by maintenance staff, 3) identify a funding source for routine maintenance, 4) revise the ODOT specifications for drying guardrail posts and rails, and 5) for future projects, the sealant and paint should be specified in the Special Provisions.

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