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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.