Obviously you could check this during prefishing to eliminate the problem, but...
Would this be a violation of the "You can't get out of the boat to better your position," rule?
You come up on a sandbar, and you can't see it well enough to know if you can skip over it or not. Stained water, low light, glare, etc. You pull your boat up on the sandbar and walk across it to see where and how soon it drops off. You find a section where the shallow section is narrow enough that you know you could easily skip over the bar before grounding out and being stuck. You get back in your boat, run far enough back to get up to full speed and then proceed to skip over that sandbar at WOT and proceed on your way.
I know you can't get out of the boat in most tournaments to land a fish, go fishing, or drag your boat over a sandbar to get into a water or area, but in this case you are driving your boat (in an area where the speed is legal) over the sandbar. In fact you might even argue that you are taking prudent safety precautions before doing so.

















