Taken directly from page 8 of the 2009-10 fishing and boating guide, between the Cumberland River entries:

Question: May I fish around a dock or marina?

Answer: It depends. Public marinas on U.S. Army Corps of Engineers lakes have contractual agreements with that address lease space on public waters. The U.S. Army Corps of Engineers presently allows the marina owners or operators to post signs that prohibit fishing within 150 feet of their floating structures. These agreements do not prohibit a person from fishing in their boat rental slip. This policy does not apply to privately owned boat docks on U.S. Army Corps of Engineers lakes.

http://fw.ky.gov/0910fishguide.asp