This summer, I was gifted a relative's costco wilderness inflatable pontoon when he upgraded. I've been a member of the bank-bound proletariat, but the price was "free" so I couldn't say no. I've taken it on a local lake a couple of times to get used to it, but I'm not a lake guy (yet). Using it to cover more water in summer and fall is the main reason why I took it. Specs say "class I" rated. I'm guessing that's not much. Are these capable of floating on low water summer/fall rivers like the Cowlitz and the PDX rivers? I'm a pretty risk-averse person (I wouldn't even think about trying this in winter), and I'm not above lining the boat and staying on the bank. Is it capable of something like blue creek to mission right now?