Stephenville Air Station

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Stephenville Air Station
Part of Pinetree Line
Newfoundland, Canada
640th Aircraft Control and Warning Squadron - Emblem.png
640th Aircraft Control and Warning Squadron emblem
Coordinates48°35′21″N 058°39′58″W / 48.58917°N 58.66611°W / 48.58917; -58.66611 (Stephenville AS N-23)
TypeRadar Station
Site information
Controlled byNortheast Air Command
Aerospace Defense Command
Site history
Built byUnited States Air Force
In use1951-1971
Stephenville AS is located in Newfoundland and Labrador
Stephenville AS
Stephenville AS
Location of Stephenville AS
Map all coordinates using: OpenStreetMap 
Download coordinates as: KML · GPX

Stephenville Air Station (ADC ID: N-23) is a closed General Surveillance Radar station. It is located 9.5 kilometres (5.9 mi) north-northwest of Stephenville, Newfoundland and Labrador, Canada.[1] It was closed in 1971.


The site was established in 1951 as a General Surveillance Radar station, built by the United States Air Force as part of the Pinetree Line of Ground-Control Intercept (GCI) radar sites.

USAF units and assignments[edit]


  • 640th Aircraft Control and Warning Squadron


See also[edit]


 This article incorporates public domain material from the Air Force Historical Research Agency website

  • A Handbook of Aerospace Defense Organization 1946 - 1980, by Lloyd H. Cornett and Mildred W. Johnson, Office of History, Aerospace Defense Center, Peterson Air Force Base, Colorado
  • Winkler, David F. (1997), Searching the skies: the legacy of the United States Cold War defense radar program. Prepared for United States Air Force Headquarters Air Combat Command.