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  • Joint Public Notice: Notice of Availability of the Regional Streamflow Duration Assessment Methods for the Northeast and Southeast

    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.

  • Joint Public Notice -- Notice of Availability of the Beta Streamflow Duration Assessment Methods for the Northeast and Southeast

    The U.S. Army Corps of Engineers (Corps) and the U.S. Environmental Protection Agency (EPA), jointly announce the availability of the Beta Streamflow Duration Assessment Methods (SDAM) for the Northeast and Southeast (dated April 12, 2023).

  • NAO-REG-190214

    Expiration date: 4/15/2019

    The proposed new definition of "waters of the United States," which clarifies federal authority under the Clean Water Act, has been published in the Federal Register, the Environmental Protection Agency and Army announced Feb. 14.

  • NAO-REG 01162019

    Expiration date: 2/8/2019

    Due to the lapse in appropriations for the U.S. Environmental Protection Agency (EPA), EPA and the Department of the Army (Army) have postponed the planned January 23 public hearing on the proposed new "Waters of the United States" definition until after appropriations have passed to fund the EPA.

  • Clean Water Act Interpretive Rule for 404(f)(1)(A) Withdrawal

    This is a public notice regarding the withdrawal of the Clean Water Act Interpretive Rule, and to help inform the public and agricultural, ranching, and silvicultural communities of the withdrawal. The U.S. Army Corps of Engineers want to make clear to the public that the statutory exemption of 404(f)(1)(A) still remains available for use when applicable for discharges of dredged and/or fill material associated with normal farming, silviculture, and ranching activities that are part of an established operation. Withdrawal date: Jan. 29, 2015.