This is interesting to read, and since I'm from the western side of SD (born and raised in the north central part), I don't know much about the eastern side of the State and I particularly detest Sioux Falls even though I've only been there a few times. 

Thought others might enjoy this little history lesson.

http://southdakotamagazine.com/the-creek-that-thinks-its-a-river?mc_cid=ead72831da&mc_eid=a4951e6016