33 USC 2316 - Environmental protection mission

(a) General rule 
The Secretary shall include environmental protection as one of the primary missions of the Corps of Engineers in planning, designing, constructing, operating, and maintaining water resources projects.
(b) Limitation 
Nothing in this section affects
(1) existing Corps of Engineers authorities, including its authorities with respect to navigation and flood control;
(2) pending Corps of Engineers permit applications or pending lawsuits involving permits or water resources projects; or
(3) the application of public interest review procedures for Corps of Engineers permits.