The U.S. Navy has awarded a Maine company a multimillion-dollar contract to make dry dock improvements at the Portsmouth Naval Shipyard.

Cianbro Corp. of Pittsfield will receive a $157 million fixed price contract for construction of a super flood basin and extending portal crane rails for Dry Dock No. 1 at the Kittery shipyard,  the Navy said in a statement Thursday evening.

Work is expected to be completed by March 2022.