GreatLakes Dredge & Docks has inked contracts to construct a tug, barge and twoscows at yards in the US Gulf at a cost of $111m.

Nasdaq-listed GLDD says the 14,000-hptug and 15,000-cubic-yard capacity trailing suction hopper barge will be builtby Signal International in a deal that includes an option.

When the units are joined upon deliveryin the second quarter of 2012 the Oak Brook-Illinois based company claims the $94marticulated tug and barge (ATB) will be the largest trailing suction hopperdredge in the US.

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