Need help on a Fishing Trip

Okay, yesterday, no less than 8 folks including my bride told me to go
fishing. Piece of cake, I'll head up to the Black Hills. Small water
that I can wade, catch some pretty trout. Oopsy, in talking to the
camp ground owners (even at the base in Rapid City), this is the week
before Sturgis and its the 70th anniversary. They're expecting a half
a million folks to start pouring in and if you don't have a camping
spot reserved (and there are no reservations left), fugetabotit.

I would like to leave Tuesday, comeback the following Monday and go
somewhere I can catch decent brown trout whilst wading. No giant
rivers please. Within about 650 miles of Omaha.
Any ideas?
Frank Reid