33 U.S.C. § 2235
Construction in usable increments
Any navigation project for a harbor or inland harbor authorized by this subchapter or any other provision of law enacted before, on, or after November 17, 1986 , may be constructed in usable increments.
( Pub. L. 99–662, title II, § 207 , Nov. 17, 1986 , 100 Stat. 4102 .)