[1][2] It was built during World War II and responsible for monitoring air traffic from Naval Station Argentia to RCAF Torbay and into the Atlantic Ocean.

The site was established in 1942 as a United States Ground Radar Early Warning Station, funded by the United States Army,[5] which stationed the 685th Air Warning Squadron on the site under operational control of Newfoundland Base Command at Pepperrell Air Force Base.

It operated an SCR-271 manned early-warning radar with information sent by radio to a plotting center at Pepperrell AFB to track aircraft.

St Bride's was the third of a chain of four stations around the Newfoundland coast and was accordingly given the radio code name of "Trio".

Units: Assignments: This article incorporates public domain material from the Air Force Historical Research Agency