Lots of good info given already.
Here is my two cents.
Vertical jigging keeping your presentation straight from the bottom to your rod tip, under control so that you feel anything that touchs that bait. As you progress down the river.
What I think Keith Kavajecz was talking about is the simplest way to follow your baits down stream. It is alot harder to back your boat down river using the bow mount then to follow your baits with the bow.
With all this being said it takes practice to master this art. The bottom changes all the time so you are letting line out and reeling line in but key is to keep making bottom contact.
I think the biggest thing I see people doing wrong is trying to fish 20 to 30 feet of water with 1/8 oz and 1/4 oz jigs. They become lost and never get the feel on making contact with the bottom. The jigs wind up getting blown out and drift aimlessly.
So the idea that lighter is better is not always ture. I have and use plenty of 1/2 oz and 5/8 oz up to 3 oz jigs. If you get the jig in front of a hungry river fish he will eat it. That is one of the benefits of plastics in cold water you get the occasional tail puller but you hook up alot more instead of feeding them minnows.
Remember vertical jigging is only one presentation for fishing the river. Casting structure, pulling jigs, dragging jigs.
I was on Pool 4 yesterday and wanted to check out the dragging bite. So I spent my day in 5 to 15 feet of water dragging ringworms. I managed a nice two man limit of fish between 15 and 20 inches. For my boat the bite was not on fire but there were alot of small fish caught. My two man limit was all sauger with one walleye. All my walleyes yesterday were bewteen 4 and 8 inches long except for the one 19 incher.
I stayed for the night bite in the rain but it did not happen for me. The fish turned on but the biggest was 18 inch sauger.
I dragged 3/16 oz 1/8 oz and 3/32 oz heads the only bait I used was ringworms. My best colors were oyster shell with a sour apple head, fire & ice with a black head, cotton candy with an orange head, chartruese pepper and sour apple head.
When the lights went down it was cotton candy and Chartruese pepper that made them munch.
Take care and Good Luck in 07
Here is a sauger that couldn’t pass up my oyster shell sour apple offering. All my fish were released on this day.
I just needed to unwind and feel the head shakes.