C.F.R. » Title 33 » CHAPTER II—CORPS OF ENGINEERS, DEPARTMENT OF THE ARMY, DEPARTMENT OF DEFENSE › PART 333—PROCESSING OF DEPARTMENT OF THE ARMY PERMITS AND 33 U.S.C. 408 PERMISSIONS, NATIONAL ENVIRONMENTAL POLICY ACT IMPLEMENTING PROCEDURES › Subpart D—Efficient Environmental Reviews

33 C.F.R. § 333.34

Supplements to environmental documents

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The District Engineer will prepare supplements to environmental documents only if a major Federal action remains to occur, and:

(a) The applicant makes substantial changes to the proposed action that are relevant to environmental concerns; or

(b) The District Engineer decides, in their discretion, that there are substantial significant new circumstances or information about the significance of the adverse effects that bear on the proposed action or its effects.

Notes of Decisions
Cited in 1 case (1 in the last 5 years), 2026–2026 · leading case: Ctr. for Biological Diversity & Idaho Conservation League v. United States Fish & Wildlife Serv. & The Army Corps of Engineers (D. Idaho 2026).
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Ctr. for Biological Diversity & Idaho Conservation League v. United States Fish & Wildlife Serv. & The Army Corps of Engineers (D. Idaho 2026). “at 72–73, and either (2) a permittee “makes substantial changes to the proposed action” or “there are substantial significant new circumstances or information” bearing on a project’s environmental impact, see 33 C.F.R. § 333.34 . Defendants argue there is no ongoing major…”
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