high water mark Line or mark left upon tidal flats, beach, or along shore objects indicating the elevation or the intrusion of high water.
the state owns all land below the Ordinary High Water Mark (OHWM) of a lake
evidence from botanists and surveyors at a regulatory hearing had established an elevation of 990 ft for the OHWM for a certain lake ...
 See also: Information, Area, Map, Mapping, High water
  
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