Montana Regulatory Offices

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Expand List item 3526Collapse List item 3526  Billings Office

Box 7032
Billings, Montana 59103
Ph: 406-657-5910
Fax: 406-657-5911

Expand List item 3525Collapse List item 3525  Helena Office

100 Neill Avenue
Helena, Montana 59601-3329
Ph: 406-441-1375
Fax: 406-441-1380

Expand List item 3527Collapse List item 3527  Missoula Office
1600 North Ave. West, Suite 105
Missoula, Montana 59801
Ph: 406-541-4845
Fax: 406-541-4849

Public Notices

  • NWO-2023-01707-MT

    Expiration date: 3/9/2025

    The U.S. Army Corps of Engineers, Omaha District, (Corps) is evaluating a permit application, which would result in permanent and temporary impacts to approximately 1.01 acre(s) of emergent wetlands and approximately 390 linear feet (LF) of stream and ditch waters of the United States. This notice is to inform interested parties of the proposed activity and to solicit comments.

  • NWO-2025-00026-MT

    Expiration date: 2/23/2025

    The U.S. Army Corps of Engineers, Omaha District, (Corps) is evaluating a permit application, which would result in permanent impacts to approximately 5.14 acres of wetlands (comprised of approximately 4.34 acres of impacts to emergent wetlands, 0.61 acre of impacts to scrub-shrub wetlands, and 0.19 acre of impacts to forested wetlands), 280 linear feet (LF) of the Cascade Canal, 169 LF of the S-T Canal, 0.014 acre below the ordinary highwater mark of the Teton River, 102 LF of a roadside ditch/Teton River Oxbow, 0.071 acre of an open water pond, and 1,465 LF of several unnamed drainages. This notice is to inform interested parties of the proposed activity and to solicit comments.

  • Regional Streamflow Duration Assessment Methods for the Arid West, Western Mountains, and Great Plains

    The U.S. Army Corps of Engineers (Corps) Albuquerque, Chicago, Detroit, Fort Worth, Galveston, Kansas City, Los Angeles, Omaha, Rock Island, Sacramento, San Francisco, St. Louis, St. Paul, and Tulsa Districts, and the U.S. Environmental Protection Agency (EPA), Regions 5, 6, 7, 8, and 9 jointly announce the availability of the Regional Streamflow Duration Assessment Methods (Regional SDAMs) for the Arid West, Western Mountains and Great Plains. The methods are rapid assessment tools for distinguishing between ephemeral, intermittent, and perennial streamflow at the reach scale for the Arid West, Western Mountains and Great Plains regions.