CFR›Title 18›Chapter III›Part 401›Subpart I ContainsSections 401.121–401.124CorpusDaily eCFRDisplayed edition2026-08-07Last updated2026-08-07 Subpart I—General Provisions Sections 401.121 § 401.121 Definitions. 401.122 § 401.122 Supplementary details. 401.123 § 401.123 Waiver of rules. 401.124 § 401.124 Construction. Source40 FR 14059, Mar. 28, 1975; 40 FR 17987, Apr. 24, 1975, unless otherwise noted. Redesignated at 52 FR 37602, Oct. 8, 1987. Previous B Subpart B—Water Resources Program Next C Subpart C—Project Review Under Section 3.8 of the Compact