The purpose of this technical note is to update an earlier 1961 Memorandum, EWP-59, which had been cancelled, to provide planning staffs with a list of the types of data needed to appraise floodwater damages to roads and bridges and conditions likely to cause bridge failurc. Basic to the analysis of floodwater damage is the determination of the elevation at which damages begin, the elevation at which maximum damage is most likely to occur, and damage estimates at intermediate elevations. The following is a list of data that needs to be obtained and developed by the engineer, hydrologist, geologist, and economist to make a joint appraisal of floodwater damages.