This touches earth science and navigation as well :-)
The whole area is surrounded by restricted areas and danger zones, for obvious reasons. So probably not too much traffic in the direct vicinity of the pads.
But channels like the one leading into Port Canaveral certainly need constant maintenance (replacing buoys and signs ...) and dredging, given the close Gulf stream and it's loops and eddies and eventually longitudinal coastal currents that carry sand and mud.
How often I do not know, depends on sediment freight and deposition, maybe multiple times a year, after storms or even constantly at different spots. There would be Navtex-messages to mariners should there be work involving dredging operations and ships that are restricted in their maneuvrability, temporarily blocked channels, or generally areas temporarily closed.