Pack a come-along and extra rope when you find it... or innertubes. They work good. Tie it off to a tree or rock upstream on the side you want to get it to with a stout line, then go out over it and tie off a couple inner tubes (deflated) or bumper balls (the big red kind) as close as you can to the boat... let the drag and lift do the work for you, and when it gets off the bottom it should swing right in to shore.
That or just hook the bumper balls up on a caribener on a long line from upstream, so the current will carry the balls down the line to the boat, then the balls will pull straight up on the bow of the boat using the current. Again, soon as the boat's off the bottom, it'll be easy to maneuver to shore w/ a hand line w/ a caribener on it sliding down that mainline. May take a couple or three bumper balls (or innertubes, but make sure to use wide, soft rope and tie several spots on the tube so you don't pinch it too bad) but it'll come. The aluminum hull doesn't hardly weigh anything under water, so it's all about overcoming the suction and drag.