The amount of current does vary depending where you are (proximity to shore, depth, on a curve), so you really ought to have a bit of variety. If you are using electronics, you'll need to drill another hole a few feet downstream of your fishing hole so that you can see your jig...if the lure is too light, it will go farther downstream than the cone of your flasher will see.
If you can't hit bottom with your jig, tie on something heavier.
Good luck.
