The biggest difference, and of EXTREME importance if you're installing it yourself, is that the Americast tub weighs about 110 lbs. vs. 350 lbs. for cast iron! I recently installed an Americast tub & I think it's great.
Summary: This impressive and accessible waterfall on the U.S/Canada border is the highest waterfall in Minnesota. Definitely worth a visit. The High Falls of the Pigeon River, also known as Pigeon Falls, is on the Minnesota/Ontario border, right off of Hwy 61. The Falls can be reached from Grand Portage State Park or Pigeon River Provincial park. On the Minnesota side it is a short walk to the falls on a pathed trail.
I think this is Yazoo River. The Tallahatchie River runs through Money, MS, which is about 10 miles north of Greenwood, MS. The Tallahatchie River and the Yalobusha River join just above Greenwood to form the Yazoo River. The actual bridge in the story/song refers to a bridge supposedly in or near Money, MS.