--a guy went over Niagara in a barrel and survived.. doesn't mean its a good idea.
--each of us should know our own limitations... if it makes you nervous don't do it. trust your gut feeling.
--take away the operater as assume you are competent.. it is very difficult without knowing what 12 ft boat you have.. if it will work.
--small boat.... a good set of oars can go along way if you get into trouble
--I had a 12 ft sears.. narrow very rounded bottom and low freeboard, it made me nervous... I have a 12 ft greenriver.. highsides, wide runs more like a 14 ft.
--you could check out your loaded speed on a lake with hand held GPS... this would give you an idea of how much river speed you would loose.
--what you have to think about is what is adequate... if you encounter floating debris do you have the power to maneuver around it.
--upstream wind causing waves or downstream wind increasing amount of power needed.
--One thing that caught me off guard ... as a novice with a whitewater kayak I was picking my way down the chilcotin staying in the milder water and within my skill level... then a more experienced kayaker in the faster water.. dumped and sucked out of his boat I was closest and almost made the fatal error of going after him and dumping myself resulting in two people needing rescue.
-I was able to swing over where he could grab my safety rope on the front of my boat and hold him until the others could swing in. they were able to turn, back in and get him on the rear of their boat.. allowing them to power him out of the area.
--my point is I got away with this cheap lesson where no one got hurt... what are you going to do if you have only enough power and boat to slide up the slower slackwater.. but debris or other boater blocks your course and you have to venture out into water where your boat is not adequate