Late summers usually see the rivers run too low to get a boat down them (more than a john boat or kayak at least), so we often just walk the rivers on foot. If we're keeping fish, we'll take a little dingy or snow sled to float the fish behind us.
We're in the water doing this. Walk the rivers, find holes, have a guy stand at the obvious outlets, then have another guy sheepdog them out of the holes so they come up out of the murk to be seen (and shot).
I've done bank fishing along big or fast rivers and on big lakes in the past in several states. Just gotta know where the holes are, and plan on doing a ton of walking, because you can't trap the fish the way you would while walking in shallow rivers and creeks. If the water is clear around cat-tails, I've had good luck around the edges there, but have only done lakes up in Minnesota like that, not sure if yours will be clear enough or what the edge flora will look like down south.