FLOOD04125

• County: Statewide
• Basin: Statewide
• Title: Interim Procedures for Evaluating Scour at Bridges
• Date: 9/1/1988
• Prepared By: Federal Highway Administration
• Floodplain - Doc Type: Educational/Technical/Reference Information

FHWA TECHNICAL ADVISORY T 5140.20
September 16, 1988

c. lations 23 CPR 650 Sub art C. The
1 88 Iev~sion 0 th a.FHWA regulat on requ~res that
bridge owners maintain a bridge inspection program that
includes procedures for underwater inspection. This
Technical Advisory and the interim procedures in the
Attachment provide guidance on the development and
implementation of procedures for evaluating bridge scour
to meet the requirements of the regulation.

d. Memorandum of Mr. Ronald E. Heinz. Director. Office of
Engineering. to Regional Federal Highway Administrators
and Direct Federal Program Administrator Dated April 17.
1987. This memorandum stated in part: "Each State
ShOUld evaluate the risk of its bridges being subjected
to scour damage during floods on the order of a 100 to
500 year return periQd or more."

e. FY 1989 High Priority Research Program of the FBWA. The
FBWA recognizes the Subject of scour at bridges as a long
range high priority national problem area for research,
and recommends that appropriate studies be carried out to
improve the state-of-practice of designing new bridges
and inspecting existing bridges for scour.

_g' .OtJ:/kr-

Thomas O. Willett, Director
Office of Engineering

Attachment

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