You might want to check out Water Skeeter. http://www.oregonfishing.com/waterskeeter.asp

I purchased the river tamer and have used it often in several small rivers I fish, and canyon water. I have had it in some decent white water and it held its own. I will probably upgrade to a better pontoon craft in the future, but for now, it gets the job done.

I took off the extra stuff on the boat, and really reduced the weight. I can pack the boat a ways now.

Nothing like the solitude of a canyon.