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<br /> .eoort No 2. Govwrm... Accau.on No J. R~s CoualoQ No
<br /> HEC.23
<br /> ~ r,IIe.ll'ld Sl.Ibbtle 5. Report Ollte
<br /> July 1997
<br /> BRIDGE SCOUR AND STREAM INSTABiliTY
<br /> COUNTERMEASURES
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<br /> Experience, Selection and Design Guidance
<br /> I 6. C>erlormll'lg OrgoYllzahOtl Code
<br /> ,
<br /> I -:' Al.othor{s) ~. Performng Of'9al'llZallOn Report No
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<br />I P.F. Lagasse, M.S. Byars, l.W. Zevenbergen,
<br />,
<br />i P .E. Clopper
<br />I .3 PerfC!'lTlII'Ig Of'9anlZatJOl'l Name and ~dreS$ 10. Won< Unit No ;TRAIS)
<br />I
<br />I Ayres Associates
<br /> 3665 JFK Parkway, Bldg. 2, Suite 300
<br /> Fort Collins, Colorado S0525
<br /> 11. Contrad or Grant No.
<br /> DTFH61.92.o0049
<br /> 12. Sponsoring~~mAdChsa 13. Type 01 Report 3nd Peciod Covered
<br /> Federal Highway Administration
<br /> National Highway Institute
<br /> 901 North Stuart Street, Suite 300
<br /> Arlington, Virginia 22203
<br /> 14. Sponsoring AlJIrtc'I Code
<br /> 15. ~"""Notes
<br /> Technical Project Manager: Mr. Jorge E, Pagan-Ortiz
<br /> Technical Reviewers: Larry Arneson, Chris Dunn, Mike Fraher, Abbi Ginsberg, Sterling Jones,
<br /> Johnnv l. Morris, E.V. Richardson, S.A. Schumm, Arlo WaddoupS
<br /> 16. AD5Ir'.a
<br /> This document provides guidelines for the selection and design of appropriate countermeasures to
<br /> mitigate potential damage to bridges and other highway components at stream crossings, A
<br /> countermeasure matrix is presented as an aid to identify most types of countermeasures which
<br /> have been used by State highway agencies (SHAs) for bridge scour and stream instability
<br /> problems, The matrix supports the selection of appropriate countenneasures considering such
<br /> characteristics as the functional application, suitable river environment, and estimated allocation
<br /> of maintenance resources. In addition, SHAs with installation experience and design guideline
<br /> references are included for each type of countermeasure, Design guidelines for the following
<br /> seven countermeasures are provided based on information obtained from SHAs: bendway
<br /> weirs/stream barbs, soil cement, wire enclOSed riprap, articulated concrete block systems,
<br /> articulating graut filled mattresses, Toskanes, and grout filled bags, Design Guideline S presents
<br /> guidance for pier and abutment riprap protection from Hydraulic Engineering Circular 18.
<br /> Key worns 18. OIStnbution Statement
<br /> bridge design, highway structures, stream This document is available to the public
<br /> stability, scour, countermeasures, bendway weirs, through the National Technical Information
<br /> stream barbs, bank barbs, reverse sills, soil Service, Springfield, VA 22161 (703) 487-
<br /> cement, wire enclosed riprap, articulated concrete 4650
<br /> block systems, cable-tied concrete, articulating
<br /> grout filled mattresses, articulating block mat,
<br /> Toskanes, grout bags, rock riprap, factor of safety
<br /> 19. Sl!lCl.l"JtVc.....,,(oI!I'lIII~l 20. ~C...,.(d~~) 21. No.olPItg8lI 22. Prie8
<br /> Unclassified Unclassified
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<br />Form DOT F 1700.7 (S-72)
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<br />Roproduclion of completed pe;e authoriZed
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