History
Lewistown Air Force Station came into existence as part of Phase III of the Air Defense Command Mobile Radar program. On October 20, 1953 ADC requested a third phase of twenty-five radar sites be constructed.
The 694th Aircraft Control and Warning Squadron was assigned to Lewistown AFS on 1 September 1958. The squadron began manual radar operations in February 1960 with AN/FPS-3A and AN/FPS-6 radars, and initially the station functioned as a Ground-Control Intercept (GCI) and warning station. As a GCI station, the squadron's role was to guide interceptor aircraft toward unidentified intruders picked up on the unit's radar scopes.
An AN/FPS-90 height-finder radar was added a year later. During 1961 Lewistown AFS joined the Semi Automatic Ground Environment (SAGE) system, initially feeding data to DC-20 at Malmstrom AFB, Montana. After joining, the squadron was re-designated as the 694th Radar Squadron (SAGE) on 1 March 1961. The radar squadron provided information 24/7 the SAGE Direction Center where it was analyzed to determine range, direction altitude speed and whether or not aircraft were friendly or hostile.
On 31 July 1963, the site was redesignated as NORAD ID Z-25, and the AN/FPS-3A was removed in 1963, replaced by an AN/FPS-66 search set. This radar was upgraded to an AN/FPS-66A in 1966. The AN/FPS-90 was removed from service in 1968.
The Air Force inactivated the 694th Radar Squadron on 30 June 1971 due to budget reductions. After the facility's closure, the housing/cantonment area was used for a time as the campus of the now-defunct Big Sky Bible College. The Air Force equipment atop Judith Mountain has been removed.
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