Walleyes are a very light sensitive fish,You fish deeper for them during the brightest days, as the sun goes down they move shallow. On those blue bird ski days with glass like lake I have jigged up Walleye in 52' of water. Highly depends on the light penitration in the water, In a good Chop on the water the light does not go as deep. The rougher the water the better the bite. You will be suprised to see how well a walleye can see in total darkness. In the evening set up your drift if you can, starting in 25'of water drifting to shallow water down to 2' The walleye will tell you were they are feeding