Lewistown Air Force Station
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Lewistown Air Force Station (1958-1971) - A Cold War Air Force Radar Station first established in 1958 on Judith Peak near Hilger, Fergus County, Montana. The cantonment area and housing areas were located below the operations area, near the ghost town of Maiden, Montana. Named Lewistown Air Force Station after the nearby town of Lewistown. Initially assigned a Permanent ID of TM-178 and later a Sage ID of Z-178. Abandoned in 1971.
HistoryEstablished in 1958 as Lewistown Air Force Station manned by the 694th AC&W Squadron. Construction was completed in April 1959 and the site went operational on 15 Feb 1960 as a manual AC&W site. The station initially had both a Ground-Control Intercept (GCI) and early warning misssion. The early warnng mission involved tracking and identifing all aircraft entering their airspace while the GCI mission involved guiding Air Force interceptors to any identified enemy aircraft. Controllers at the station vectored fighter aircraft at the correct course and speed to intercept enemy aircraft using voice commands via ground-to-air radio. Initial equipment included the FPS-3A search radar and one FPS-6A height finder radar. A FPS-90 height finder radar was added in 1961. SAGE System TransitionThe transition of the manual GCI system to the automated SAGE system began with the installation of the FST-2 coordinate data transmitter and search radar upgrades. The FST-2 equipment digitized the radar returns and transmitted the digital returns to the SAGE direction center. Under the SAGE System, interceptor aircraft were directed to their targets by the direction center computers and controllers, greatly reducing the need for local controllers and equipment at every radar station. The FST-2 was a very large digital system using vacuum tube technology. Over 6900 vacuum tubes were used in each FST-2 requiring 21 air-conditioned cabinets, 40 tons of air conditioning, 43.5 kva of prime power, and usually a large new addition to the operations building. The FST-2B modification added two more cabinets but with newer solid-state (transistor) technology to process coded responses from aircraft transponders. The FST-2 at Lewiston AFS was located on the upper site adjacent to the operations area. SAGE System Operation The site began operation as a SAGE site on 1 Mar 1961 feeding the Malmstrom SAGE Direction Center DC-20 at Malmstrom AFB. The FPS-3A radar was replaced in 1963 with a FPS-66 search radar that was upgraded to a FPS-66A configuration in 1966. The FPS-90 height finder was removed from service in 1968 leaving the site with a single height finder. ClosureLewistown AFS and the 694th were deactivated on 30 Jun 1971.
Physical PlantThe physical plant of the site was divided into an upper radar/operations site on Judith Peak and a lower site with the cantonment area and two housing areas.   The upper radar/operations site housed the operations building, the radar towers and the backup generators. The lower cantonment area housed the enlisted barracks, the bachelor officer's quarters, the orderly room, the chow hall, the motor pool. Apart from the cantonment area were two housing areas. A seven unit housing area was provided for officers and senior NCOs. A separate twenty unit housing area was provided for lower ranking NCOs and airmen. A separate upper GATR radio site was built on Red Mountain in 1960 to housed the radio equipment for directing aircraft intercepts. Contract cost of the GATR Site was $256,166 for a 26 by 113 foot masonry block building and 1.5 miles of access road.
* Not the actual building numbers but reference numbers to the plan.
Current StatusPrivate property. Many buildings remain in the cantonment area and just a few in the family housing area. The radar/operations site and the GATR radio site buildings have been mostly demolished. The cantonment area and the housing areas were used for a time as the campus of the Big Sky Bible College. Satellite views of the lower site show many of the cantonment area buildings still existing although both barracks are demolished with only the foundations showing. A few homes remain in the large housing area while only one remains in the smaller housing area. The school building appears intact. Two buildings remain on the main upper site that were in use during the operational period, one building was used as the Telco/microwave terminal. The other building was located alongside the operations building and now is within a small fenced in compound with air-ground radio antennas surrounding it. This may be a FAA remote radio site. The GATR site on Red Mountain has bee demolished.
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