U.S. States: Louisiana: Rapides County
I just went to the website you mentioned and the date for Ann Coashti Dowty's birth is wrong. She was Ann Coashti Dark's daughter and was born in 1841, according to the book I read.
Ann Coashti Dowty's husband, John Cross Dowty, was the riverboat captain and he died as results of an explosion of one of the riverboats. I have read in one of the 2 books I mentioned that his body was never found. His portrait is in the book called LOUISIANA PORTRAITS, along with a short article about his life.