A field study at seven bridge sites was conducted to evaluate the effectiveness of the current method of riprap protection of bridge piers used in Washington State. The method consists of using protective riprap as a streambed--level scour arrester, with the riprap being dumped into place in an excavation surrounding the pier and with the top of the riprap stone being placed at streambed level. Three solid wall and four single circular cylindrical shaft piers were studied. Field methods are described, and correlation with hydraulic data are included where possible. Generally the method seems to have worked well, as little loss or subsidence of riprap was noted; however, some of the bridges are fairly new and have not yet been subjected to major floods. On the basis of field observations, a modification is suggested for minimizing possibilities of scour concentrations between piers. Suggestions are included for routine inspection and maintenance of bridge piers and foundations in streams, and for more early attention to hydraulic considerations in pier location. /FHWA/

  • Supplemental Notes:
    • The study was conducted for the U.S. Department of Transportation, Federal Highway Administration, Region Ten, Portland, Oregon.
  • Corporate Authors:

    Northeast Corridor

    Seattle, WA  United States 
  • Authors:
    • Nece, R E
  • Publication Date: 1974-1

Media Info

  • Pagination: 85 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00263038
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: Final Rpt.
  • Files: TRIS, USDOT
  • Created Date: Oct 22 1974 12:00AM