Statement of Significance (as of designation - May 5, 1989):
Now known as PORTSMOUTH, LIGHTSHIP NO. 101 is one of a small number of preserved American lightships. Essential partners with lighthouses as aids to navigation along the coast of the United States, American lightships date to the 1820s. Built as one of two vessels from the same plan, NO. 101 served at least five stations in the middle Atlantic states guiding coastal, intercoastal, and international vessels into the Chesapeake Bay, Delaware Bay, and within Nantucket Bay.