TPWD contracts with a few places along the river. Check their website. Whitewater amphitheater is right on 306 and has good wading access when the flow is is manageable. They have the contract, but you have to get there early as there is a limit to licensed fishers. Otherwise you pay a fee. L&L campground has great bank access with a mile of frontage for a daily fee. Rio raft has good wading access for a fee. Those 3 places will get you started. Bring a wading staff and check the flows. I was there yesterday and the flow was around 400cfs. It was manageable but slick with deep ruts I'm the limestone. I also went when it was over 600 and I wouldn't advise it. Good news is that it fished well yesterday.