@grammyn I don't know what it's called! It is located across the street from a chemical or aluminum plant (I forget which) and I think it is used to move product from the plant to ships on the river. My husband would know, as he worked at chemical plants for 40 years, but I forgot to ask him today. (He is in a long-term care facility with Parkinson's disease and dementia, but the thing he talks about most is the plant. And the grandchildren!)
@eudora thanks Diane. I was wondering if it had something to do with the levee or something else. My knowledge of the levee system is woefully minimal. Perhaps you can think to ask him next time you visit. He would probably enjoy talking about it.
@grammyn Looks like a mechanical system that allows them to hold back or release the water as the river rises. Just a guess!