33 CFR § 333.34 - Supplements to environmental documents.

---
identifier: "/us/cfr/t33/s333.34"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "33 CFR § 333.34 - Supplements to environmental documents."
title_number: 33
title_name: "Navigation and Navigable Waters"
section_number: "333.34"
section_name: "Supplements to environmental documents."
chapter_name: "CORPS OF ENGINEERS, DEPARTMENT OF THE ARMY, DEPARTMENT OF DEFENSE"
part_number: "333"
part_name: "PROCESSING OF DEPARTMENT OF THE ARMY PERMITS AND 33 U.S.C. 408 PERMISSIONS, NATIONAL ENVIRONMENTAL POLICY ACT IMPLEMENTING PROCEDURES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "5 U.S.C. 301; 33 U.S.C. 401  33 U.S.C. 1344; 33 U.S.C. 1413; 42 U.S.C. 4321"
regulatory_source: "90 FR 29472, July 3, 2025, unless otherwise noted."
cfr_part: "333"
---


# 333.34 Supplements to environmental documents.

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.