50 C.F.R. § 80.57

A proposed project qualifies as substantial in character and design if it:

(a) Describes a need consistent with the Acts;

(b) States a purpose and sets objectives, both of which are based on the need;

(c) Uses a planned approach, appropriate procedures, and accepted principles of fish and wildlife conservation and management, research, construction, wildlife- and fish-associated-recreation participation and access, communication, education, or other eligible purposes; and

(d) Is cost effective.