Synthesizing the Scientific Foundation for Ordinary High Water Mark Delineation in Fluvial Systems

For more than 100 years, the ordinary high water mark (OHWM) has been used to define water boundaries in a number of contexts in the United States. This Special Report summarizes the scientific literature pertaining to the indicators used to identify the OHWM in fluvial systems, building on more than a decade of research and publications related to the OHWM in the ongoing process to implement the Clean Water Act and the Rivers and Harbors Act of 1899. This report does not change or redefine the indicators used to identify the OHWM, nor is it a manual for how to delineate the OHWM. This report first reviews established concepts in river science that relate to the OHWM then reviews various sources of information that can be used to delineate the OHWM, discusses geographic variations in OHWM indicators among river segments, reviews human activities that can affect the OHWM, and finally presents examples of the OHWM in diverse channel types and regions. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. This document is intended to provide only general, non-binding guidance and information related to the concept and definition of the ordinary high water mark (OHWM), to assist federal agency officials and others in delineating the OHWM for different purposes. Although this document contains references to legally binding federal statutes and regulations, none of the information provided in this document substitutes for those statutes or regulations, nor is this document a regulation itself. Agency officials retain the discretion to adopt approaches on a case-by-case basis that may differ from approaches described in this document, where appropriate. Any determinations of the OHWM for statutory or regulatory purposes will be made in accordance with the applicable statutes and regulations. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. DESTROY THIS REPORT WHEN NO LONGER NEEDED. DO NOT RETURN IT TO THE ORIGINATOR. ERDC/CRREL SR-16-5 iii

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