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US Army Corps of Engineers

Omaha District Website

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Regulatory and Section 408 Programs

The Omaha District provides regulatory oversight for all or part of six states.

Regulatory Notice Archive

State Regulatory Offices

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Colorado

Regulatory Office/ Permits

Littleton - (303) 979-4120

Montana

Regulatory Office/ Permits

Helena - (406) 441-1375
Billings - (406) 657-5910
Missoula - (406) 541-4845 X328

Nebraska

Regulatory Office/ Permits

Wehrspann (Omaha Area) - (402) 896-0896

North Dakota

Regulatory Office/ Permits

Bismarck - (701) 255-0015

South Dakota

Regulatory Office/ Permits

Pierre - (605) 224-8531

Wyoming

Regulatory Office/ Permits

Cheyenne - (307) 772-2300

Special Public Notice: Applicability of the Clean Water Act 404(f)(1)(C) exemption for the construction or maintenance of irrigation ditches and the maintenance of drainage ditches within Colorado

U.S. ARMY CORPS OF ENGINEERS, OMAHA DISTRICT, COLORADO REGULATORY OFFICE

Published March 25, 2021

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SUBJECT: On July 24, 2020, the U.S. Army Corps of Engineers (Corps) and U.S. Environmental Protection Agency (EPA) issued a memorandum to the field regarding application of the exemptions under Section 404(f)(1)(C) of the CWA for the construction or maintenance of irrigation ditches and for the maintenance of drainage ditches. For purposes of implementing the ditch exemptions, the memo defines terms including “irrigation ditch” and “drainage ditch” and provides a framework for determining the applicability of the ditch exemptions and the recapture provision in CWA Section 404(f)(2). The memorandum provides a clear, consistent approach regarding the application of the exemptions, superseding prior national guidance.

DESCRIPTION: The attached fact sheet identifies the specifics relating to how this memorandum affects the Corps’ Regulatory Program in Colorado and where to find more information.