Justin, look for them to be in the channel when they're not feeding and look for them in the shallows when they are. A prime spot would be where it makes a bend. The outside of the bend will be deeper and hopefully have some kind of cover in it, like submerged trees left by floodwaters. The bank here will be steeper and flats like to hug up against the walls of drop offs. The inside of the bend will be a sand bar with shallows that attrack minnows and baitfish. Willows in the water in these areas make them even more attractive.
Same applys for bridges with pilings. Holes will be washed out around the bottoms of them and hopefully there may be some kind of cover there also. Could be trees, rocks or refidgerators. And shade from the sun.
Hehe, that long looking gar looks like some kind of prehistoric hedge trimmer.