NTSB: Swing span over-rotated into channel before barge impact

Switch work had been conducted on the Barataria Bridge two days before the incident

(WASHINGTON) — The National Transportation Safety Board (NTSB) has completed its investigation of the Nov. 22, 2020, accident involving barges towed by the vessels Trent Joseph and George C. and the Barataria Bridge near Barataria, La.

Trent Joseph and George C. were towing two barges southbound in the Barataria Waterway. While passing through the open Barataria Bridge, the second barge contacted the bridge’s swing span. The bridge, which was the only means of road access for the community of Barataria, was damaged and remained unusable until Nov. 28. There were no injuries and no pollution reported. Damage to the barge was negligible, while damage to the bridge was reported to be more than $500,000.

51684897803 7f1612bfd8 B

Postaccident damage to the Barataria Bridge in Louisiana looking north. The corner of the swing span that the barge contacted is circled. NTSB photo

Both the Barataria Bridge’s center and east fenders had red navigation lights to mark the ends and middle of each fender. The east fender’s red lights were removed for repair before the accident. The captain of Trent Joseph stated that, as the tow approached the bridge, the two red lights marking the center fender that should have been visible to him were not. He used a spotlight to look for the fenders when approaching the bridge. When Trent Joseph was about 100 feet from the bridge, the captain saw with the spotlight that the swing span had “over-rotated” and extended past the center fender wall. Louisiana Department of Transportation and Development maintenance records indicated that two days before the accident, work had been conducted on the bridge’s limit switches (which prevent the movement of the swing span beyond a predetermined point).

Investigators determined the probable cause of the contact of the tow of Trent Joseph with the Barataria Bridge was a corner of the bridge’s swing span protruding outside of its protective fendering into the navigable channel after recently attempted repairs to the limit switch system that controlled the swing span’s rotation limit.

Marine Accident Brief 21/22 is available here.

– National Transportation Safety Board

Categories: Casualty News