Free lake depth maps can be found online on different websites. Several websites that offer free lake depth maps are Fishidy and MyTopo.
Fishidy requires a profile to be created to view the maps. Lakes can be searched with a ZIP code or a person can explore the map and look at lakes from numerous locations. MyTopo offers lake depth maps for more than 6,800 lakes in 46 states. It does cost money to be able to view the maps. To find a map, the state will be required and then available lakes with depth maps will be shown. Some states offer more lake maps then others.