8 Jan 2025

8 January 2025 - The U.S. Army Corps of Engineers and the U.S. Environmental Protection Agency Jointly Announce the Availability of the National Ordinary High Water Mark Field Delineation Manual for Rivers and Streams (National OHWM Manual)

The U.S. Army Corps of Engineers (USACE) and the U.S. Environmental Protection Agency (EPA) jointly announce the availability of the Final National Ordinary High Water Mark Field Delineation Manual for Rivers and Streams (Final National OHWM Manual). The Final National OHWM Manual serves as a non-mandatory technical resource which can be used in appropriate situations to assist with identifying and delineating the ordinary high water mark (OHWM) of rivers and streams located throughout the Nation.