I do see fish on my locator when doing this but it’s by no means a requirment to fish an area. I mean a guy can pull right up the gut headed for the rollers and catch fish after fish in the heavy current coming through the dam and never spot a fish on their electronics. The fish are just real tight to the bottom in the little depressions and such down there.
I usually like to find the spot on the spot vs. just making long passes at a certian depth. Usually my runs are 150′ long or so and I work them real slowly letting the current supply the action on the cranks. If I hit a fish, I stop, swing around and figure out the “why and where” to get a feel for if it was just one of those isolated instances or if there’s a bunch of fish working a prime piece of ground adjancent to a current edge or structure. Keeps the time spent in unproductive water down to a minimum.
How long? Varies. From 3.5′ – 6′ or so. Less in snaggy conditions when I need real good control of the position of the lure behind the swivel in relationship to the bottom and more when I need to crank to really wander down into all the nooks and cranies these fish hide in when the currents moving good. Really, the important thing is the relationship of the dropper to the leader for EACH style and model of crank you use. A #13 rap runs deeper than a #11 while the #9’s run virtually the same as a #11. Shallow shads run deeper than the floaters and require a longer dropper, Salmos do too. You get the picture. Typically I start with a 4′ leader and go from there.
How heavy? I have bells on board from 3/16th ounce up to “damn heavy.” I usually just go by starting with a 3 ounce bell and adjusting from there if I need more weight or if I find I can get by with less.
I mentioned some very productive areas in my report… that will get you where you need to be good buddy! Let us know how you do.