33 CFR § 117.491 - Red River.
(a) The draw of the Union Pacific Railroad bridge, mile 90.1, at Alexandria, shall open on signal if at least eight hours notice is given.
(b) The draw of the US 165 (Jackson St.) bridge, mile 88.6, at Alexandria, shall open on signal if at least eight hours notice is given; except that, from 7 a.m. to 9 a.m. and from 4 p.m. to 6 p.m. the draw need not be opened Monday through Friday except holidays.
(c) The draws of the bridges above mile 105.8 through mile 234.4 need not open for passage of vessels. The owner or agency controlling the bridge must restore the draw to full operation within three months if notified by the District Commander that the needs of navigation require resumed operation of the spans.
(d) The draws of the bridges above mile 234.4 to mile 276 need not be opened for passage of vessels.
(e) When a vessel which has given notice fails to arrive at the time specified in the notice, the drawtender shall remain on duty for up to two additional hours to open the draw if that vessel appears. After that time, a new notice of the appropriate length of time is required.