Its primary mission is to provide a radar testing range (35 acres or 141,640 m2) and various administrative and warehousing structures for the Norfolk Naval Station.
The Elizabeth River and St. Julien's Creek form its eastern and southern boundaries, respectively, of the annex.
[citation needed] The St. Julien's Creek Annex began operations in 1849 as an ordnance and material storage facility.
[citation needed] In 1969, St. Julien's Creek was disestablished under U.S. Department of Defense and was consolidated as an annex to the Naval Weapons Station at Yorktown, Virginia.
[citation needed] Beginning in the late 1930s, waste ordnance materials were disposed on site.