Code of Federal Regulations Title 33. Navigation and Navigable Waters § 33.117.609 Mystic River

The draw of the S99 Alford Street Bridge, mile 1.4, shall open on signal;  except that, Monday through Saturday, excluding holidays, the draw need not open for the passage of vessel traffic from 7:45 a.m. to 9 a.m., 9:10 a.m. to 10 a.m., and 5 p.m. to 6 p.m., daily. From November 1 through March 31, between 3 p.m. and 7 a.m., at least an eight-hour advance notice is required for bridge openings by calling the number posted at the bridge.