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This video has a slight delay in starting and involves some reading, but the Reversing Falls definitely have a story to be told. After watching the video, please scroll down for further explanation of the three tides, and some photos.
ImportantBelow is a photo of a sign at Wolastaq Park - Showing Irving Pulp & Paper Mill, the bridge, and St. John River and the Reversing Falls. In the above video and in the below photos, the area with the paper mill is refered to as area #1 and the other side of the bridge is refered to as area #2.
photo explaining area 1 and are 2 of the reversing falls

Tides are the periodic rise and fall of the sea caused by the gravitational pull of the moon and the sun on the Earth. Fundy’s tides are the highest in the world because of an unusual combination of factors: resonance and the shape of the bay.

The water in the Bay of Fundy has a natural resonance or rocking motion called seiche. You could compare this to the movement of water in a bathtub. Although the water in a bathtub sloshes from one end to the other and back again in a few seconds, it takes about 13 hours for the water in the bay to rock from the mouth of the bay to the head of the bay and back again. As the ocean tide rises and floods into the bay every 12 hours and 25 minutes, it reinforces the rocking motion.

To imagine this, picture an adult giving a gentle push to a child on a swing. Just a very small push is required to keep the swing moving. Likewise the seiche in the bay is sustained by the natural resonance of the ocean tides. The bay’s shape and bottom topography are secondary factors contributing to Fundy’s high tides. The bay becomes narrower and shallower 426 feet to 131 feet toward the upper bay, forcing the water higher up onto the shores.
Source: “Tides of Fundy” by the Fundy Guild at Fundy National Park.

There are three (3) tides - Low, Slack, and High Tides
Low tide at viewing area #1
- water flowing towards the bridge with whirlpools
Low tide
Low tide
Slack tide at viewing area #1 - water is calm
slack tide
Start of High tide at viewing area #1
- water flowing away from the bridge -
no whirlpools until full high tide
high tide
go to the next adventure of the two  RV Gypsies in CanadaWolstaq Park, Saint John, New Brusnwick