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<br />,. "_No. FHWA HI-97-030 2. GovemmentAcceuion No. 3. Recipient's C8III1og No.
<br />HEC-23
<br />04. rllleandSubtitIe 5. Report 08te
<br />BRIDGE SCOUR AND STREAM INSTABilITY July 1997
<br />COUNTERMEASURES
<br />Experience, Selection and Design Guidance
<br /> 6. Performing Organization Code
<br />7. AuIhor(s) 8. Performing Organization Report No.
<br />P.F. Lagasse, M.S. Byars, l.W. Zevenbergen,
<br />P.E. Clopper
<br />9. Performing Organization Name and Addreu 10. Worit Unit No. (TRAlSI
<br />Ayres Associates
<br />3665 JFK Parkway, Bldg. 2, Suite 300
<br />Fort Collins, Colorado 80525
<br /> 11. Contr8ctorGrantNo.
<br /> DTFH61-92-00049
<br />12. Sponsor;ng Agency Name and AddreN 13. TypeofReportendPeriodCoverecI
<br />Federal Highway Administration
<br />National Highway Institute
<br />901 North Stuart Street, Suite 300
<br />Arlington, Virginia 22203
<br /> 14. Sponaorng Agency Code
<br />15. Supplementary NoteI
<br />Technical Project Manager: Mr. Jorge E. Pag6n-Ortlz
<br />Technical Reviewers: Larry Arneson, Chris Dunn, Mike Fraher, Abbl Ginsberg, Sterling Jones,
<br />Johnnv l. Morris, E.V. Richardson, SA. Schumm, Arlo WaddouDS
<br />16. Abetract
<br />This document proVides guidelines for the selection and design of appropriate countenneasures to
<br />mitigate potential damage to bridges and other highway components at stream crossings. A
<br />countenneasure matrix is presented as an aid to identify most types of countenneasures which have
<br />been used by State highway agencies (SHAs) for bridge scour and stream Instability problems. The
<br />matrix supports the selection of appropriate countenneasures considering such characteristlcs as the
<br />functional application, suitable river environment, and estimated allocation of maintenance resources.
<br />In addition, SHAs with Installation experience and design guideline references are Included for each
<br />type of countenneasure. Design guidelines for the following seven countenneasures are provided
<br />. based on Infonnatlon obtained from SHAs: bendway weirs/stream barbs, soli cement, wire enclosed
<br />riprap, articulated concrete block systems, articulating grout filled mattresses, Toskanes, and grout
<br />filled bags. Design Guideline 8 presents guidance for pier and abutment riprap protection from
<br />HYdraulic Enalneerina Circular 18.
<br />1r.KeyWotdo 18. DiItrbullon Stmemert
<br />bridge design, highway structures, stream stability, This document is available to the public
<br />scour, countenneasures, bendway weirs, stream through the National Technical
<br />barba, bank barbs, reverse sills, soli cement, wire Infonnatlon Service, Springfield, VA
<br />enclosed rlprap, articulated concrete block systems, 22161 (703) 487-4650
<br />cable-tied concrete, articulating grout filled
<br />mattresses, articulating block mat, Toskanes, grout
<br />bags, rock rJprap, factor of safetv
<br />19. Sectxity Clauif. (of this report) 20. SecurityCIauif. (ofthispttge) 21. No.ofPegu 22. Pnco
<br />Unclassified Unclassified
<br />
<br />Fonn DOT F 1700.7 (8-72)
<br />
<br />Reproduction of completed page authorized
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