(a) For all drawbridges across the Black River, notice requesting the opening of a draw may be given to the dispatcher of the Port Huron Police Department. Public vessels of the United States, state or local vessels used for public safety, and vessels in distress shall be passed through each drawbridge on the river as soon as possible.
(b) The draws of the Military Street bridge, mile 0.3, and Seventh Street bridge, mile 0.5, both at Port Huron, shall open on signal; except that, from May 1 through October 31 from 9 a.m. to 5:30 p.m. Monday through Saturday except Federal holidays, the draw need be opened only on the hour and half hour and, from November 1 through November 30 and April 1 through April 30 from 4 p.m. to 8 a.m., the draw shall open if at least three hours notice is given. From December 1 through March 31, the draw shall open if at least 24 hours notice is given.
(c) The draw of the Tenth Street bridge, mile 0.9 at Port Huron, shall open on signal--
(1) From May 1 through October 31 from 8 a.m. to 11 p.m. and from 11 p.m. to 8 a.m., if at least one hours notice is given;
(2) From April 1 through April 30 and November 1 through November 30, if at least three hours notice is given; and
(3) From December 1 through March 31, if at least 24 hours notice is given.