The cost of operation and maintenance of the general navigation features of small boat harbor projects shall be borne by the United States. This section shall apply to any such project authorized (A) under section 201 of the Flood Control Act of 1965 [ 42 U.S.C. 1962d–5 ], (B) under section 107 of the River and Harbor Act of 1960 [ 33 U.S.C. 577 ], (C) between January 1, 1970 , and December 31, 1970 , under authority of this Act, and to projects heretofore authorized in accordance with the policy set forth in the preceding sentence and to such projects authorized in this Act or which are hereafter authorized. ( Pub. L. 91–611, title I, § 103 , Dec. 31, 1970 , 84 Stat. 1819 ; Pub. L. 93–251, § 6 , Mar. 7, 1974 , 88 Stat. 15 .) Editorial Notes References in Text This Act, referred to in text, means Pub. L. 91–611 , Dec. 31, 1970 , 84 Stat. 1818 . For complete classification of this Act to the Code, see Tables. Hereafter, referred to in text, probably means after Dec. 31, 1970 . Amendments 1974— Pub. L. 93–251 amended section generally. Prior to amendment, section read as follows: “The costs of operation and maintenance of the general navigation features of small boat harbor projects authorized between January 1, 1970 , and December 31, 1970 , under the authority of this Act, section 201 of the Flood Control Act of 1965 [ 42 U.S.C. 1962d–5 ], or section 107 of the River and Harbor Act of 1960 [ 33 U.S.C. 577 ], shall be borne by the United States.”