MPW,

Your practical options are fish the upper river (park) with a map or fish the middle/lower river with a guide.

You will catch fish with a guide, and will probably not catch fish without, but will have a good day either way.

The OP is beautiful!! The smells, trees, eagles, water ,all are distractingly beautiful especially if if you are from the city.
One thing I really like about the OP,is that (almost) no body who lives there takes it for granted.