1. Short title This Act may be cited as the Improving Corps Civil Works Compensatory Mitigation Act . 2. Fish and wildlife mitigation Section 906 of the Water Resources Development Act of 1986 ( 33 U.S.C. 2283 ) is amended— (1) in subsection (d)(3)(B)(iv)— (A) in subclause (I), by inserting or contract (as defined in subsection (i)(1)) after instrument ; and (B) in subclause (II), by inserting or contract (as so defined) after instrument ; (2) in subsection (i)— (A) by redesignating paragraphs (1) through (4) as paragraphs (2) through (5), respectively; (B) by inserting before paragraph (2) (as so redesignated) the following: (1) Definition of contract In this subsection, the term contract means an agreement between the Secretary and a mitigation provider that— (A) uses accepted Corps of Engineers District-level mitigation practices described in part 332 of title 33, Code of Federal Regulations (or successor regulations); and (B) prioritizes implementation of an existing restoration plan developed by a State, local, or regional entity that covers the area or resources affected by the civil works project that is the subject of the third-party arrangement. ; (C) in subparagraph (A) of paragraph (2) (as so redesignated)— (i) in clause (i), by striking and at the end; and (ii) by adding at the end the following: (iii) the purchase of credits under part 332 of title 33, Code of Federal Regulations (or successor regulations) in accordance with section 332.4(c)(6) of that title (or a successor regulation) through a contract to satisfy the mitigation plan required under subsection (d); and ; (D) in paragraph (3) (as so redesignated), by striking paragraph (1) and inserting paragraph (2) ; and (E) in paragraph (4) (as so redesignated), in the matter preceding subparagraph (A)— (i) by inserting the Secretary shall ensure that before contributions ; and (ii) by striking may