Usually they are opposites occurring about 180 days apart.
|Center of a cypress dome|
March 17, 2014
Well here's photographic proof:
Low water is the stagnant pool on the right. Then clearly visible, but also camouflaged, on the left is the annual high-water mark two feet up the base of the fluted cypress tree trunk.
Still not sure if I'd be willing to take this photo during true high water.