Nice Pictures but I think Ranger Smith lied to you.
That waterfall isn't even close to the tallest falls East of the Mississippi, it's only about 50 feet high.
But is one of the largest (by volume/water flow):
"The Upper Falls is one the largest waterfalls east of the Mississippi.
It has a drop of nearly 50 feet and is more than 200 feet across.
A maximum flow of more than 50,000 gallons of water per second has been recorded cascading over these falls."
http://www.michigandnr.com/parksandtrails/Details.aspx?type=SPRK&id=428
I don't know exactly where it comes in order of largest by volume east of the Mississippi but Niagara Falls and Cohoes Falls in NY are both a lot larger going by Volume.
And I'd guess there are probably others as well.
And there are quite a few that are a lot higher:
http://traveltips.usatoday.com/tallest-waterfalls-east-mississippi-106213.html