Often walleye aren't right on bottom but are suspended in the middle of the water column and often this is during the summer months and the walleye are being picky. One technique that I have found to be very productive is to long line drop shot walleye by using either a number 4 split shot up the line or a bullet weight Carolina rigged.
To successfully use this method you need to have out a lot of line like 100 feet and use light line like 6 lb fluorocarbon line. The trick is the keep the bait moving slowly throw the water either in the top half of the water column or up off the bottom. Often this technique is best when the lake is dead calm and the trolling motor is used to keep the bait moving very slowly through the water. I have found that leeches, nightcrawlers, and minnows work the best when long lining with split shot rig. Here are some things that you will want to use to successfully long line split shot walleye:
So when the fishing is tough and the usual bottom bouncing and trolling crankbaits isn't working give long line split shotting a try. If you see fish on your depth finder that are suspended this technique is hard to be beat.