emb.. its really hard to visualize what you just said. What river are you fishing?
The best advice I can give is to find somewhere the baitfish are concentrating, and better yet, somewhere the baitfish are breaking the surface being chased by preditors.. those preditors are flathead food quite often.
“shallow silt sand bay with lots of timber near bank about 5 to 8 ft here then a drop on outside edge that leads to overhanging trees where drop off meets bank “
Is there any significant current bordering this *bay*? Is this on the inside, or outside of the “slight bend in the long strait stretch”?
Either way it could possibly be a very good spot if I translated it properly. The 1st place I always look is a current seam, or obvious significant structures that look to be prime ambush locatons.
“drop on outside edge that leads to overhanging trees where drop off meets bank” … Does this happen to be on the downstream side of this *bay*? I am guessing its likely where the main channel(current) is cutting out the bank on the “the slight bend”.
Either way, it sounds like a likely flathead holding area to me, and its worth trying to fish it. Fish along the current seams, and place baits ahead of obvious choice looking structures… fish the area well. If it doesnt produce, move on and try it for a period of time another evening. The fish will let you know befoe long if they are using it.