I don't buy the "absolute rule" they are deep in summer and shallow in spring on many lakes including cold lake. Mark fish and drop and drag your gear there. Might be 20' or it might be 90'
Ice off the lake - early season - many many years and we are down 60'-90' and catching fish best at that depth.
Summer on a lake that size and the thermocline isn't that deep, and I've caught tons of lakers in August down only 25' or 30' (longer set back).
I've also caught them casting a spoon into "the soup" and jerking it on the surface in low light as they drive bait to the surface in the middle of summer.
I've also nailed on a fish down 120' off the rigger and then one on the planner board on a deep diving rapala (maybe down 20') like 4 minutes apart.
Lakers go where there is food. Mark them and fish where you see the fish.
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