(a) The draws of each bridge across the Duwamish Waterway shall open on signal, except as follows:
(1) From Monday through Friday, except all Federal holidays but Columbus Day, the draws of the First Avenue South Bridges, mile 2.5, need not be opened for the passage of vessels from 6 a.m. to 9 a.m. and from 3 p.m. to 6 p.m., except: The draws shall open at any time for a vessel of 5000 gross tons and over, a vessel towing a vessel of 5000 gross tons and over, and a vessel proceeding to pick up for towing a vessel of 5000 gross tons and over.
(2) The draw of the South Park highway bridge, mile 3.8, need not be opened for the passage of vessels from 6:30 a.m. to 8:00 a.m. and 3:30 p.m. to 5:00 p.m., Monday through Friday, except Federal holidays.
(b) The following bridges shall open on the specified signals:
(1) Burlington Northern Santa Fe railroad bridge, mile 0.4, and Southwest Spokane Street bridge, mile 0.3, one prolonged blast followed quickly by three short blasts.
(2) Burlington Northern Santa Fe railroad bridge, mile 0.4, one prolonged blast followed quickly by one short blast.
(3) First Avenue South bridge, mile 2.5, three prolonged blasts.
(4) South Park highway bridge, mile 3.8, one prolonged blast followed quickly by one short blast and one prolonged blast.
(c) When fog prevails by day or by night, the drawtender of bridges listed in this section, after giving the acknowledging signal to open, shall toll a bell continuously during the approach and passage of vessels. [CGD 82-025, 49 FR 17452, Apr. 24, 1984, as amended by CGD13 84-14, 49 FR 35498, Sept. 10, 1984; CGD13 8-13, 49 FR 35628, Sept. 11, 1984; CGD13 84-12, 50 FR 10228, Mar. 14, 1985; CGD13 85-01, 50 FR 30271, July 25, 1985; CGD13 91-05, 56 FR 41284, Aug. 20, 1991; CGD13-99-005, 66 FR 33025, June 20, 2001; USCG-2002-12471, 67 FR 41332, June 18, 2002]