All facilities, structures and activities placed on or over Entergy's shoreline lands or the water require a permit from Entergy prior to installation or placement. Examples include boat docks, seawalls, riprap, boardwalks, PWC docks, piping for irrigation systems of HVAC geothermal loops, etc. You may contact the Lakes and Property Coordinator of Entergy at (501) 844-2148 to request a permit application packet. Entergy also has a quarterly newsletter that is full of good information about Lake Hamilton & Lake Catherine ... be sure to ask to be added to their mailing list.