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Accident Report Detail

​Marine Accident Brief: Breakaway of Tanker Harbour Feature from its Moorings and Subsequent Allision with the Sarah Mildred Long Bridge

Executive Summary

​On April 1, 2013, at 1324 local time, the 473-foot-long tanker Harbour Feature, with 20 persons on board, allided with the Sarah Mildred Long Bridge in Portsmouth, New Hampshire, after the vessel broke free from its moorings at the New Hampshire State Port Authority, Marine Terminal Wharf. No injuries or pollution resulted from the accident. The bridge sustained $2.5million in damage; the Harbour Feature sustained $1 million in damage.

Probable Cause

The National Transportation Safety Board determines that the probable cause of the breakaway of the Harbour Feature from its moorings and subsequent allision with the Sarah Mildred Long Bridge was the inadequate mooring arrangement made by the master and the pilot for the vessel's location and the prevailing tidal conditions.

Accident Location: Portsmouth , NH    
Accident Date: 4/1/2013
Accident ID: DCA13LM014

Date Adopted: 11/12/2014
NTSB Number: MAB-14-21
NTIS Number:  

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