Article

NTSB investigation: Contact of tow with bridge pier linked to pilot’s ineffective actions


published on 2 March 2021 157 -

The accident location, as indicated by the red triangle.

The US National Transportation Safety Board (NTSB) issued an investigation report on the contact of Cooperative Spirit tow with Hale Boggs Memorial Bridge Pier, on the Lower Mississippi River in March 2020.

The accident

On March 15, 2020, about 0113 local time, the towing vessel Cooperative Spirit, pushing a 29-barge tow, was transiting downstream on the Lower Mississippi River at mile 121.6 near Luling, Louisiana, when the port side of the tow struck the eastern tower pier of the Hale Boggs Memorial Bridge. The tow broke apart and began floating downriver. One of the barges sank, while the remaining barges were recovered by the Cooperative Spirit and other towing vessels in the area. No pollution or injuries were reported. Multiple barges in the tow, along with other barges moored along the river banks that were struck by drifting barges, were damaged and required repairs. Two barges were determined to be total constructive losses. The estimated cost of damages to the barges and cargo was $1.65 million.
Cooperative Spirit moored before the accident.
Cooperative Spirit moored before the accident.
Cooperative Spirit moored before the accident.
Cooperative Spirit moored before the accident.
The pilot had slept for 5–6 hours prior to the accident watch, the accident occurred close to the beginning of his watch when he would have been most alert, and he stated that he drank a cup of coffee and felt good up until the accident. Results of postaccident toxicology tests were negative. Thus, fatigue and alcohol and drug use were not considered factors in the accident.

The pilot at the helm of the Cooperative Spirit held the appropriate credentials for his position and had extensive experience maneuvering large tows on the waterway. The pilot had been involved in an accident while operating the same vessel two months prior; however, the circumstances of that accident (a collision in a bend while upbound) were significantly different.
Track of Cooperative Spirit tow as it flanked the bend at 26 Mile Point and maneuvered prior to the accident
Track of Cooperative Spirit tow as it flanked the bend at 26 Mile Point and maneuvered prior to the accident
Track of Cooperative Spirit tow as it flanked the bend at 26 Mile Point and maneuvered prior to the accident
Track of Cooperative Spirit tow as it flanked the bend at 26 Mile Point and maneuvered prior to the accident
The pilot stated that, as the tow came out of the turn at 26 Mile Point, the stern of his vessel was too close to the left descending bank, and the current was setting the tow into the bridge pier. About 3 minutes before the accident, the tow’s heading was 124 degrees, while its course over ground was 114 degrees, which is consistent with the pilot’s statement. Due to high-water conditions, the current was stronger than normal, and an eddy may have formed upriver of the bridge along the left descending bank, making maneuvering more difficult.

Although the pilot stated that he used starboard rudder and increased engine speed in an attempt to counteract the current, the video evidence showed that he used limited rudder as the tow approached the bridge. The pilot chose to primarily use increased engine speed in an effort to move the tow to starboard away from the bridge pier, stating that he “tried to outrun [the current].” However, the tow’s course over ground did not appreciably change as engine speed increased, while the increasing speed over ground reduced the time the pilot had to maneuver. Ultimately, the pilot’s actions in compensating for the strong current were ineffective, resulting in the tow hitting the bridge’s eastern tower pier.

Probable Cause

The National Transportation Safety Board determines that the probable cause of the contact of the Cooperative Spirit tow with a pier of the Hale Boggs Memorial Bridge was the pilot not effectively compensating or the strong current while navigating a turn and approaching the bridge in high-water conditions.
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