Section 165.901 - Great Lakes-regulated navigation areas and safety zones(a) The following are regulated navigation areas:(1)Lake Huron.(i) The waters of Lake Huron known as South Channel between Bois Blanc Island and Cheboygan, Michigan; bounded by a line north from Cheboygan Crib Light (LL-1340) at 45°39'48" N., 84°27'36" W.; to Bois Blanc Island at 45°43'42" N., 84°27'36" W.; and a line north from the mainland at 45°43'00" N., 84°35'30" W; to the western tangent of Bois Blanc Island at 45°48'42" N., 84°35'30" W.(ii) The waters of Lake Huron between Mackinac Island and St. Ignace, Michigan, bounded by a line east from position 45°52'12" N., 84°43'00" W.; to Mackinac Island at 45°52'12" N., 84°39'00" W.; and a line east from the mainland at 45°53'12" N., 84°43'30" W.; to the northern tangent of Mackinac Island at 45°53'12" N., 84°38'48" W.(2)Lake Michigan.(i) The waters of Lake Michigan known as Gray's Reef Passage bounded by a line from Gray's Reef Light (LL-2006) at 45°46'00" N., 85°09'12" W.; to White Shoals Light (LL-2003) at 45°50'30" N., 85°08'06" W.; to a point at 45°49'12" N., 85°04'48" W.; then to a point at 45°45'42" N., 85°08'42" W.; then to the point of beginning.(ii) The waters of Lake Michigan known as Green Bay from Rock Island Passage or Porte Des Morts Passage north to Escanaba Light at 45°44'48" N., 087°02'14" W.; south to the Fox River Entrance at 44°32'22" N., 088°00'19" W., to the Sturgeon Bay Ship Canal from Sherwood Point Light at 44°53'34" N., 087°26'00" W.; to Sturgeon Bay Ship Canal Light at 44°47'42" N., 087°18'48" W.; and then to the point of beginning.(b) Regulations: (1) In the RNAs under paragraph (a) of this section, the District Commander or respective COTP may issue orders to control vessel traffic for reasons which include but are not limited to: Channel obstructions, winter navigation, unusual weather conditions, or unusual water levels. Prior to issuing these orders, the District Commander or respective COTP will provide advance notice as reasonably practicable under the circumstances. The respective COTP may close and open these regulated navigation areas as ice conditions dictate.(2) Prior to the closing or opening of the regulated navigation areas, the COTP will give interested parties, including both shipping interests and island residents, not less than 72 hours notice of the action. This notice will be given through Broadcast Notice to Mariners, Local Notice to Mariners, and press releases to the media (radio, print and television), local COTP will ensure widest dissemination. No vessel may navigate in a regulated navigation area which has been closed by the COTP. The general regulations in 33 CFR 165.13 apply. The District Commander or respective COTP retains the discretion to authorize vessels to operate outside of issued orders.(c) The following are safety zones:(1)Lake Erie. The area known as the Lake Erie Islands which is defined as the U.S. waters of Lake Erie at the intersection of the International Border at 082°55'00" W., following the International Border eastward to the intersection of the International Border at 082°35'00" W., moving straight south to position 41°25'00" N., 082°35'00" W., continuing west to position 41°25'00" N., 082°55'00" W., and ending north at the International Border and 082°55'00" W.(2)Lake Huron. The waters of Lake Huron known as Saginaw Bay, Michigan; bounded by a line from Port Austin Reef Light (LL-10275) at 44°04'55" N., 082°58'57" W.; to Tawas Light (LL-11240) at 44°15'13" N., 083°26'58" W.; to Saginaw Bay Range Front Light (LL-10550) at 43°38'54" N., 083°51'06" W.; then to the point of beginning.(d)Enforcement :(1) The District Commander or respective Captain of the Port (COTP) will enforce these safety zones as ice conditions dictate. Under normal seasonal conditions, only one closing each winter and one opening each spring are anticipated.(2) Prior to closing or opening these safety zones, the District Commander or respective COTP will give the public advance notice, not less than 72 hours prior to the closure. This notice will be given through Broadcast Notice to Mariners, Local Notice to Mariners, and press releases to the media (radio, print and television), and the local COTP will ensure widest dissemination. The general regulations in 33 CFR 165.23 apply. The District Commander or respective COTP retains the discretion to permit vessels to enter/transit a closed safety zone under certain circumstances.USCG-2015-0084, 82 FR 37519 , Aug. 11, 2017