Andy,
Thats about the same area where Dan ran aground. If the weather is that hot you can bet that the water levels are low and will expose some bars, rocks, etc to your lower unit, although 5' should have been enough to get on plane.
In the Spring I run the river in that depth of water a lot slower as there could be trees and debris that were "moved" during the winter.
That river loves lower units. I lost mine in 20' of water, running 5900 rpms, at Maggies. Didn't hit anything but the river troll broke my clutch dog and the foot of the motor just exploded.