I was there too, I live there. It is like the poor man's Sturgis but its what we got. There were a few sport bikes, mostly ridden by the Sioux City squids.
Back on topic, even for me it would a good length ride. If you want to then ride, just bring rain gear, an extra visor, and rain-ex. One of my old neighbors in Omaha takes both his bikes there, trailers. A friend of mine here rides half the time. If you come up by the SIoux City area hit me. Whitenoise can vouch for me being a good guy.