2 November 2021 - The U.S. Army Corps of Engineers, as part of an interagency effort with the U.S. Environmental Protection Agency, the U.S. Fish and Wildlife Service, and the U.S. Department of Agriculture Natural Resources Conservation Service, is announcing the availability of the final 2020 National Wetland Plant List (NWPL). The Federal Register Notice for the 2020 NWPL update can be found here: https://www.federalregister.gov/documents/2021/11/02/2021-23891/national-wetland-plant-list

The NWPL provides plant species wetland indicator status ratings, which are used in determining whether the hydrophytic vegetation factor is met when conducting wetland delineations under the Clean Water Act and wetland determinations under the Wetland Conservation Provisions of the Food Security Act. Other applications of the NWPL include wetland restoration, establishment, and enhancement projects. The list is effective as of 2 November 2021 and will be used in any wetland delineations performed after this date. Completed wetland delineation/determination forms should reference the version of the NWPL used to complete the form.  The final NWPL is available at https://wetland-plants.sec.usace.army.mil/ (preferred browsers are Chrome and Firefox). 

Yesterday, December 1, 2022, USACE and EPA announced the availability of the Interim Draft of the National Ordinary High Water Mark Field Delineation Manual for Rivers and Streams (National OHWM Manual) and its accompanying data sheet. Please go to:  https://www.usace.army.mil/Media/Announcements/Article/3233308/1-december-2022-release-of-the-interim-draft-of-the-national-ordinary-high-wate/ to view the public notice, the Interim Draft of the National OHWM Manual, and additional information on the research supporting OHWM identification and delineation.