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Accident Report Detail

Marine Accident Brief: Anchor Contact of Articulated Tug and Barge Clyde S VanEnkevort / Erie Trader with Underwater Cables and Pipelines

Executive Summary

​At 1732 local time on April 1, 2018, the articulated tug and barge (ATB) Clyde S VanEnkevort/ Erie Trader was westbound with a crew of 14 in the Straits of Mackinac, Michigan, when the barge’s starboard anchor, which had unknowingly released and was dragging on the bottom, struck and damaged three underwater electrical transmission cables and two oil pipelines. About 800 gallons of dielectric mineral oil leaked into the water from the cables; the oil pipelines sustained only superficial damage. Repair and replacement of the cables was estimated at more than $100 million. No injuries were reported.

Probable Cause

​The National Transportation Safety Board determines that the probable cause of the anchor contact of articulated tug and barge Clyde S VanEnkevort/Erie Trader with underwater electricity transmission cables and oil pipelines was the failure of the anchor detail to secure the barge’s starboard anchor, and the improper adjustment of the anchor brake band after the engineering crew replaced the brake liner, the combination of which allowed the anchor and chain to pay out under way.

Accident Location: Straits of Mackinac , MI USA about 2 miles west of Mackinac Bridge, 45°49.20’ N, 084°46.30’ W
Accident Date: 4/1/2018
Accident ID: DCA18FM019

Date Adopted: 5/21/2019
NTSB Number: MAB1912
NTIS Number:  

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