117.509—Vermilion River.
(a)
The draw of the S82 bridge, mile 22.4 at Perry, shall open on signal; except that, from 9 p.m. to 5 a.m. the draw shall open on signal if at least four hours notice is given.
(b)
The draws of the following bridges shall open on signal; except that, from 6 p.m. to 10 a.m. the draws shall open on signal if at least four hours notice is given:
(d)
During the 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.