High tide line averaged over 18.6 years.
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The mean high tide line is the average location of the high tide over a specific period of time. It is used to demarcate the boundary between private and public property along coastal shorelines.
A co-tidal line is a line on a map connecting points on the Earth's surface that experience high tide simultaneously. It represents the progression of high tide across an ocean or sea due to the gravitational attraction of the moon and sun.
When the flood tide comes in and covers the beach to the high tide line.
nertic
I think you meant 'clam at high tide' or the full version 'happy as a clam at high tide'. This is an idiom/expression dating from the early 19th century. The expression means to be very joyful or content.
neap tide