33 CFR § 117.1097 - Sheboygan River.
The draw of the Eighth Street bridge, mile 0.69 at Sheboygan, shall open as follows:
(a) From May 1 through October 31 -
(1) Between the hours of 6 a.m. and 10 p.m., the bridge shall open on signal, except that:
(i) From 6:10 a.m. to 7:10 p.m., Monday through Saturday, the draw need open only at 10 minutes after the hour, on the half-hour, and 10 minutes before the hour; and
(ii) From Monday through Friday, except Federal holidays, the draw need not open between 7:30 a.m. and 8:30 a.m., between 12 p.m. and 1 p.m., and between 4:30 p.m. and 5:30 p.m.
(2) Between the hours of 10 p.m. and 6 a.m., the draw shall open on signal if at least 2 hours advance notice is provided.
(b) From November 1 through April 30, the draw shall open on signal if at least 12 hours advance notice is provided.
(c) At all times, the draw shall open as soon as possible for public vessels of the United States, state or local government vessels used for public safety, vessels in distress, vessels seeking shelter from rough weather, or any other emergency.