When I am fishing the back country for trout or more than a mile away from my Jeep on a smallmouth bass river, I always carry a breathable-waterproof raincoat in the back of my fishing vest. This has to pack down small enough to easily fit into my vest. The Simms Hyalite Rain Shell Jacket is perfect. Staying dry is important even in the summer months. Once on a five mile smallmouth river summer float trip two of the five anglers in our group had no raincoats. Three hours up the river from our take-out the rain started and continued heavily all day. Even though we all offered to share our raincoats, the two wet anglers refused. By the time we got to the take out spot our friends were shivering badly. Imagine how cold these two anglers would have been if our float trip had been in March or October.
The most dependable way to get good information on what you might encounter on a new float trip is to talk to someone who has floated that area recently, then follow their advice. Two years ago a friend in Montana did not follow this advice and he flipped his boat and drowned. Recently two friends did not ask me about floating a smallmouth bass river and I believe they relied only on a guide book. The float trip they had planned should have taken six hours. As it turned out it took them seventeen hours. They had to cross three large dams and they finally got out of the river at three in the morning, naturally in the dark. The next time they asked me where to float!