"In the center of the channel between the 2 white jugs is where it happened. "
Those two jugs are there to warn you that you're now entering the river entrance (the 3rd jug is to warn you of the monster boulder as you get closer to the river). If you watch your sonar as you get close to the jugs, it looks like there's a wall of rocks there, from 6'-2' in a blink of an eye. Like Sapman said, stay to left of the south jug or better yet, trim all the way up as far as you can, coast about 50 yards past that point, leave it trimmed up and off you go. I've been making that run for over 20 years and very very seldom do I leave my motor down for the trip up to Tenderfoot or back from it.