high water

high water (countable and uncountable, plural high waters)

1. (uncountable) The location of high tide on a coastal area.
   • 1941 January, the late John Phillimore, “The Forth Bridge 1890-1940”, in Railway Magazine, page 5:

     So as not to impede navigation the two principal spans of the bridge were designed to provide a clear headway of 157 ft. above high water for a distance of 500 ft.; [...].

2. The state of the tide when the water is at its highest.
3. (countable) The highest stage of a river.

• low water

• high-water mark

• “high water”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.