Kenbo,
You know where the fish is located, but if you are to hook it, how will you land it on that side of the stream. You should cast from the other side, it's certainly open enough for fly casting. Also, don't cast too many times into the same spot. Measure your distance by casting to a different location, once you have the distance, then drop a green articulated streamer into the abyss.
If you're going to use spin gear and artificial lures, then I would try the following:
1) Zoom 5 in Wooly bug in orange / green combo...it's just a deadly creature bait.
2) 4 in Black body tube with electric blue tentacle with a homemade shaker. This IS a big largemouth slammer in river and creek systems. To make a shaker: 1) cut a clear straw into 1/2 inch pieces 2) heat up a pair on pliers and seal one end 3) add 4-7 small shot bb's from a shot gun shell) 3) seal the opposite end at 180 degrees.
3) Ribbit makes soft plastic frogs that act as buzz baits. If you get there early in the AM, then you might have a heart attack if the bass comes up for it lol!
Good luck!