I'm in Missouri too, when I fish Bennett Springs, which the trout are comparable, I use a 5 weight line. You could also go up or down a size without much problem.
For the size you mentioned, I would suggest a 3wt or 4 wt. If you are fishing smaller creeks for smaller trout or fishing for panfish, a 1wt or 2wt should be fine. A 5wt or 6wt can be used for fishing for trout in lakes and some bass. By the sounds of what you are doing, I would go with a 3wt or 4wt.