On any body of water I have ever been to, there have always been largemouth on the bank or in shallow water, year round, as long as there is food. Bass are not "sensitive" fish, they are at home in just about any depth, and are quite adaptable. They will go where the food goes. In lakes with lots of shad, I imagine they would go deeper in the summer, because that's where the food goes. In a grassy natural lake, you'll find them everywhere. It's not uncommon for me, in the same day to catch a bass in the middle of the hottest part of the summer in 6 inches of water and then in 20+ feet of water.....................because food is in both places.