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411. In the rare circumstances where the Administrator has determined competing federal interests were unavoidable and has analyzed floodplain impacts for compliance with 44 CFR § 60.3 or higher standards, the Administrator may find only USACE projects recognized by FEMA in 2000 and 2003 and improvements to pre-existing federal-aid transportation systems to be allowable uses. (44 CFR § 80.19(a)(ii)).