  the portsmouth naval shipyard (pns), often called the portsmouth navy yard, is a united states navy shipyard located in kittery on the southern boundary of maine near the city of portsmouth, new hampshire. pns is tasked with the overhaul, repair and modernization of us navy submarines.home - portsmouth naval shipyard. navsea.navy.mil (1939-05-23). retrieved on 2014-05-24. the facility is sometimes confused with the norfolk naval shipyard in portsmouth, virginia. ==history== thumb|left|shipyard in 1853 established on 12 june 1800 during the administration of president john adams, the portsmouth naval shipyard is the oldest continuously-operating shipyard in the united states navy. it is situated on a cluster of conjoined islands called seavey's island in the piscataqua river, whose swift tidal current prevents ice from blocking navigation to the atlantic ocean.history of the portsmouth naval shipyard the area has a long tradition of shipbuilding. since colonial settlement, new hampshire and maine forests provided lumber for wooden boat construction. commissioned here in 1690, the falkland is considered the first british warship built in the thirteen colonies. the royal navy reserved the tallest and straightest eastern white pine trees for masts, emblazing the bark with a crown symbol. during the revolution, the  was built in 1776 on badger's island in kittery, and would be the first vessel to fly an american flag into battle. even though she was captured and served in the british navy, raleigh has been d
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