Section 165.815 - Ohio River at Louisville, KY; regulated navigation area(a) The following is a regulated navigation area: The waters of the Ohio River from the Clark Memorial (Highway) Bridge at Mile 603.5, downstream to McAlpine Dam at Mile 604.4.(b) The general regulations governing regulated navigation area contained in 33 CFR part 165 , subpart B apply.(c) No pleasure or fishing craft shall be operated within the regulated navigation area at any time without prior permission of the Captain of the Port, Ohio Valley, except in case of emergency and except for passage through McAlpine Lock.CGD 2-89-04, 55 FR 23203, June 7, 1990. Redesignated by CGD 96-026, 61 FR 33669, June 28, 1996, as amended by USCG-2018-0533, 85 FR 8173, Feb. 13, 2020