Ameren owns Bagnell Dam that forms the Lake of the Ozarks.  At one time, they owned all of the land and water as well.  They sold off the most of the shoreline, and now are charged with operating the dam under a license from The Federal Energy Regulation Commission. This includes managing the shoreline as well as the water, and dock permits fall under this category as well. 

Pay attention to the dock permits when buying a waterfront home at the Lake of the Ozarks.  Just because a dock is in place, with a permit number on it, verify that the permit is valid and for the dock as it sits, where it sits on the water.  This can greatly impact the value of your property.