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FHWA TECHNICAL ADVISORY T 5140.20 September 16, 1988 (2) Bridge scour evaluations should be conducted for each bridge to determine whether it is scour critical. A scour critical bridge is one with abutment or pier foundations which are rated as unstable due to: a observed scour at the bridge site or E a scour potential as determined from a scour evaluation study. (See Attachment, Chapter 5.) (3) The interim procedures in Chapter 5 of the Attachment should be followed in conducting and documenting the results of scour evaluation studies. d. Scour Critical Existinq Bridqes. A plan of action should be developed for each existing bridge determined to be scour critical. (See Attachment, Chapter 5.) (11 The plan of action should include instructions regarding the type and frequency of inspections to be made at the bridge, particularly in regard to monitoring the performance and closing of the bridge, if necessary, during and after flood events. (See Attachment, Chapter 7.) (2) The plan of action should include a schedule for the timely design and construction of scour countermeasures determined to be needed for the protection of the bridge. (See Attachment, Chapter 7.) e. Bridge Inspectors. Bridge Inspectors should receive appropriate training and instruction in inspecting bridges for scour. (See Attachment, Chapter 6.) (1) The bridge inspector should accurately record the present condition of the bridge and the stream. (2) The bridge inspector should identify conditions that are indicative of potential problems with scour and stream stability. (3) Effective notification procedures should be available to permit the inspector to promptly communicate findings of actual or potential scour problems to others for further review and evaluation. 4 I I G I I I I I I , I I I I I I I I 'I I