Section 117.635 - Keweenaw Waterway(a) The draw of the U.S. 41 Bridge, mile 16, shall open on signal, except that: (1) From April 15 through December 14, between the hours of 7 a.m. and 7 p.m. Monday through Friday, less Federal holidays, the bridge shall open on signal from five minutes before to five minutes after the hour and half hour for vessels. Documented vessels over 300-feet shall not be held at the bridge but will be passed as soon as possible.(2) From April 15 through December 14 between midnight and 4 a.m. daily, the draw shall be placed in the intermediate position and open on signal if at least 2 hours' notice is given.(3) From December 15 through April 14 the draw shall open on signal if at least 12 hours' notice is given.USCG-2022-0237, 88 FR 59800 , Aug. 30, 2023 81 FR 48371 , 8/24/2016; 81 FR 66810 , 10/31/2016; 88 FR 59800 , 9/29/2023