Code of Federal Regulations Title 33. Navigation and Navigable Waters § 33.117.637 Manistee River

(1) From May 1 through October 31, between 7 a.m. to 11 p.m., the bridges shall open on signal. From 11 p.m. to 7 a.m., the bridges need not open unless notice is given at least two hours in advance of a vessel's time of intended passage through the draws.

(2) From November 1 through April 30, the bridges need not open unless notice is given at least 24 hours in advance of a vessel's time of intended passage through the draws.