Searsport Harbor in Searsport is located on Penobscot Bay, about four miles northeast of Belfast Harbor and 26 miles north of Rockland Harbor. The harbor is used principally for the receipt of petroleum products and salt, and the export of lumber, paper, and much of Aroostook County’s annual potato crop. The piers servicing the Mack Point terminal include the State of Maine’s public general purpose cargo pier (two berths) and the Sprague Energy liquid bulk pier (two berths) used by Sprague Energy and Irving Oil Company.

The project, completed in 1964, consists of an access channel, 35 feet deep and 500 feet wide, west of Sears Island; and a 35-footdeep turning basin extending from the end of the access channel to the piers at Mack Point. The turning basin has a maximum width of 1,500 feet. A portion of the upper end of the channel was deauthorized by WRDA 1999 to enable pier and berth expansion.