How deep is the water here? This is a common question for anyone who enjoys time near or on the water. The underwater landscape of lakes are mapped for a lot of reasons – for fisherman interested in structure attractive to their favorite species, for hunters looking for areas attractive to waterfowl, for water managers needing to know how much water is being stored, and for biologists looking to improve aquatic conditions for the creatures that lurk beneath the waves as well as those who seek them by boat or land. Here is a great source of information on waters where bathymetric surveys have been completed.