The Mississippi River is home to over 100 spieces of fish.  This is defining to the vast spectrum of environments within the system that support all these varieties.  Knowing your spieces and identifing there needs and likes then matching it to the thousands of acres of water flat out is a challenge.  What we know about walleye is like current, but not to much.  They are preditor that pretty much eats anything.  They can go to deep water or to shallow water.  So how is that for a start.  In one study by the DNR, they concluded that 1/3 of the walleyes live on wingdams, 1/3 live on the channel edge, and 1/3 life in backwater.  This is a little helpful because they also state that wingdams only account for 2% of the water.  So that is why you see so many fisherman on wingdams right?  One third of the fish on two percent of the structure, that sounds easy.  But you also have 95% of the fisherman there.  I will extend that of the other two thirds of the walleye out there they only inhabit 10% of that space.  So finding those fish can be very lucritive.  Now these number apply to “normal” conditions, which to the river is myth, there is no normal to the river.  So to be a good, consistent walleye fisherman you need to read the river and then have a big bag of tricks to deal with the normal of the day.