So what you couldn't see in the previous post because we were busy zipping across a wire strung between telephone poles was what we were looking at while we were up there.
I found this video on utube that shows just what happens there every day.
The video starts out at high tide with the tide pushing water up the river.
Then it shows low tide when the water is running down river.
When we arrived in the morning, the fresh water was running out to sea.
But by the time we finished our daredevil stunts, it had reversed and the salty sea water was pushing back.
It really was a sight to see even without all the acrobatics.
So if you ever find yourself looking for something to do in St.John, New Brunswick, Canada, I'd highly recommend this spectacle.