Great Bay Marine

The New Hampshire Seacoast’s only year-round, full-service boating facility – just six miles up the Piscataqua River on 36 acres serving Portsmouth, Newington, and the surrounding communities year-round full-service marina boat service and repair winter storage with easy year-round access to stored boats founded in 1956 by the Griffin Family 128 slips and 72 moorings fully-stocked Ship’s Store and Parts Department 32 acres of clean storage space one hour drive from both Boston and Portland competitive rates in the yard, discount prices in the store room to work with a knowledgeable staff