[Code of Federal Regulations] [Title 33, Volume 1] [Revised as of July 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 33CFR117.33] [Page 546] TITLE 33--NAVIGATION AND NAVIGABLE WATERS CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY PART 117_DRAWBRIDGE OPERATION REGULATIONS--Table of Contents Subpart A_General Requirements Sec. 117.33 Closure of draw for natural disasters or civil disorders. Drawbridges need not open for the passage of vessels during periods of natural disasters or civil disorders declared by the appropriate authorities unless otherwise provided for in Subpart B or directed to do so by the District Commander.