LOTS of tidal rivers in Pacific rain-coastal Washington State...the creeks are called sloughs (pronounced slew)...a whole microecosystem of their own, slow and salty and muddy...
And that full moon? I can recall, as a child when the clamming was still good...we would look for the lowest tides at the ocean beaches, which co-ordinated with moon phase, of course.
But still no river here with a tidal bore that I ever heard of...it's fascinating!
Photo of razor clam dug near Kalaloch, NW Washington State ocean beach (nice fat one, too):