06/12/2026
On June 12, 1800 the Portsmouth Naval Shipyard was established with the purchase of Fernald/Dennett Island for $5500.00 This price was for 58 acres of land in the middle of the Piscataqua River. The Island had been in the Fernald Family since 1645. In 1794, it became the property of John Fernald. It was then sold to James Sheafe, who sold it to William Dennett.
When Dennett sold the Island to the Government, it only held a few sheds and a two story family house. The map shown is from 1856.
The first submarine, the L-8 was built 117 years later.