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17 "In planning thelocation of a highway, serious consideration should be given to locations that avoid areas subject to flooding. If an encroachment of a floodplain is necessary, an evaluation should be made of the flood potential, the effect of the flood potential on the highway, and the effect of the highway construction on the flood hazard. Such evaluations should assure that any highway structure, roadway embankment, or bridge, that encroaches on or crosses the floodplain of a drainage course will not cause a significant adverse effect to develop- ments in the floodplain and will be capable of withstanding the flood flow with minimum damage". ~ \~ 6> In part, the memorandum reads as follows: The Federal Highway Administration requires that the State Highway Departments make (or cause to be made) the flood hazard evaluation. Thus, inquiries regarding the effects of proposed highways should be made of those Departments. The effects of existing or proposed upstream or local flood prevention or control measures will generally be learned from the agency or organization responsible for such measures and will be used in conjunction with Guideline 13. If information on the eff~cts of proposed highways or protective measures is nowhere available, the agencies mentioned in Section 3 of Executive Order 11296 may be able to provide as.sistance in determ.ining the effects. (11).... .MAKE THE EVALUATION OF FLOOD HAZARD FOR THE SITE OR STRUCTURE, USING INFORMA TION COMPILED UNDER THE PRECEDING GUIDELINES, AND DECIDE WHETHER THE PROPOSED USE IS SUITABLE AT THE PROPOSED LOCATION AND, IF SO, UNDER WHAT CONDITIONS. If the impact analysis mentioned in Guideline 5 has been made, that analysis will provide the information needed for a decision about" proposed use.