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Regulatory Division

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The purpose of the public notice process is to solicit comments from the public and information necessary to evaluate the probable impact on the public interest regarding the proposed activity seeking authorization from the USACE. Responses preferred to be submitted through RRS or can be submitted via email or mail to the District.

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The USACE is soliciting comments from the public; Federal, State, and local agencies and officials; Tribal Nations; and other interested parties in order to consider and evaluate the impacts of proposed activity by applicants. Any comments received will be considered by the USACE to determine whether to issue, modify, condition, or deny a permit for proposed activities. To make this determination, comments are used to assess impacts to endangered species, historic properties, water quality, general environmental effects, and the other public interest factors listed above. All factors which may be relevant to the proposal will be considered including cumulative impacts thereof; among these are conservation, economics, aesthetics, general environmental concerns, wetlands, historical properties, fish and wildlife values, flood hazards, floodplain values, land use, navigation, shoreline erosion and accretion, recreation, water supply and conservation, water quality, energy needs, safety, food and fiber production, mineral needs, considerations of property ownership, and in general, the needs and welfare of the people.

Comments are used in the preparation of an Environmental Assessment and/or an Environmental Impact Statement pursuant to the National Environmental Policy Act. Comments are also used to determine the need for a public hearing and to determine the overall public interest of the proposed activity. Any comments or objections which are received during this period may be forwarded to the applicant for possible resolution before the determination is made whether to issue or deny the requested permit. Please note that all comments received will become part of the administrative record and are subject to public release under the Freedom of Information Act.

Notice of Availability of the Regional Streamflow Duration Assessment Methods for the Northeast and Southeast

Regulatory Division

Published June 12, 2025

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The U.S. Army Corps of Engineers (Corps) Baltimore, Buffalo, Charleston, Chicago, Detroit, Fort Worth, Galveston, Huntington, Jacksonville, Kansas City, Little Rock, Louisville, Memphis, Mobile, Nashville, New England, New Orleans, New York, Norfolk, Philadelphia, Pittsburgh, Savannah, St. Louis, Tulsa, Vicksburg, and Wilmington Districts, and the U.S. Environmental Protection Agency (EPA) Regions 1, 2, 3, 4, 5, 6, and 7 jointly announce the availability of the Regional Streamflow Duration Assessment Methods (Regional SDAMs) for the Northeast and Southeast (dated June 12, 2025). The methods are rapid assessment tools to help distinguish between ephemeral, intermittent, and perennial streamflow at the reach scale for the Northeast and Southeast SDAM Regions.

These Regional SDAMs were developed for use in all or part of the states of Alabama, Arkansas, Connecticut, Delaware, Florida, Georgia, Illinois, Indiana, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Mississippi, Missouri, New Hampshire, New Jersey, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, Rhode Island, South Carolina, Tennessee, Texas, Vermont, Virginia, West Virginia, and the District of Columbia by the Corps and the EPA (Figure 1). These methods result from a literature review and multi-year field study conducted at 358 stream reaches across the range of hydrologic landscapes of the Northeast and Southeast. Developed through statistical analyses of the field data, these SDAMs provide a data-driven approach using reliable indicators to determine streamflow duration class at the reach scale. The agencies are making these final Regional SDAMs available for public use. This follows completion of a more than one-year preliminary implementation and comment period on beta methods to inform development of the final Regional SDAMs.

The Regional SDAMs for the Northeast and Southeast can be applied whenever there is uncertainty regarding streamflow duration class and a rapid evaluation method is desired. The methods provide a scientifically supported, rapid assessment framework to support best professional judgment in a consistent, robust, repeatable, and defensible way. The classification outcome resulting from application of the methods may inform a range of activities where information on streamflow duration class can improve ecological assessment, management, and decision-making. The Regional SDAMs were developed specifically from data collected in the Northeast and Southeast.

Practitioners such as stream ecologists, aquatic ecologists, hydrologists, and wetland scientists are encouraged to utilize the Regional SDAMs. All materials and tools necessary to understand and support application of the Regional SDAMs can be found at: https://www.epa.gov/streamflowduration-assessment.

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