33 CFR §117.505

1. (a)The draw of the S58 bridge, mile 22.2 at Montegut, and the draw of the S55 bridge, mile 27.3 at Klondyke, shall open on signal; except that from 9 p.m. to 5 a.m. the draws shall open on signal if at least four hours notice is given.
2. (b)The draw of the St. Ann bridge, mile 28.8 at Bourg, shall open on signal if at least 24 hours notice is given.
3. (c)The draw of the S3087 bridge, mile 33.9 at Houma, shall open on signal; except that, from 5 p.m. to 9 a.m. the draw shall open on signal if at least four hours notice is given.
4. (d)The draws of the Howard Avenue bridge, mile 35.0, and the Daigleville bridge, mile 35.5, at Houma, shall open on signal; except that, the draws need not open for the passage of vessels Monday through Friday, except holidays from 7 a.m. to 8:30 a.m. and 4:30 p.m. to 6 p.m. From 10 p.m. to 6 a.m., the draws shall open on signal if at least four hours notice is given.
5. (e)During advance notice periods, the draws of the bridges listed in this section shall open on less than four hours notice for an emergency and shall open on signal should a temporary surge in waterway traffic occur.