[Code of Federal Regulations] [Title 33, Volume 1] [Revised as of July 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 33CFR64.23] [Page 154] TITLE 33--NAVIGATION AND NAVIGABLE WATERS CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY PART 64_MARKING OF STRUCTURES, SUNKEN VESSELS AND OTHER OBSTRUCTIONS --Table of Contents Subpart C_Structures Sec. 64.23 Duration of marking on structures. Markings determined to be required shall be established and maintained until: (a) The structure is removed; or (b) Otherwise directed by the District Commander.