117.500—Tchefuncta River.
The draw of the S22 Bridge, mile 2.5, at Madisonville, shall open on signal, from 7 p.m. to 6 a.m. From 6 a.m. to 7 p.m., the draw need only open on the hour and half hour, except that, from 6 a.m. to 9 a.m. and from 4 p.m. to 7 p.m. Monday through Friday except Federal holidays, the draw need only open on the hour.