You folks got me to do some searching, and this I found specific to Table Rock:
SWLR1130-2-57.pdf
This memorandum provides for the establishment of a commercial zone at marina concession sites and at Table Rock Lake's Remote Service Docks in the interest of public safety and for the protection of concessionaire and customer property. This includes the process for permitting commercial concessionaire authority to place signs to restrict all but commercial activity within this zone.
Commercial Zone is defined as a designated area where only commercial activities are authorized. Recreational activities such as fishing, swimming, and diving are prohibited from public use including marina customers and patrons. No fishing tackle may be cast into this area. Commercial activity is typically the procurement of materials, supplies and services from the marina concessionaire. The commercial zone will include fuel and store docks, restaurant docks, and boat storage docks.