Sundance Air Force Station

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Sundance Air Force Station (1962-1968) - A Cold War Air Force Radar Station established in 1960 on Warren Peak near Sundance, Crook County, Wyoming. Named Sundance Air Force Station after the nearby town of Sundance. The main site was powered by a portable nuclear power plant. The site was initially assigned a Permanent ID of TM-201, later a Sage ID of Z-201. The operation was discontinued in 1968.

Sundance AFS Headquarters & Orderly Room in 2020.
Sundance AFS Mess Hall (left) & Barracks (right) in 2020.
Former Sundance Air Force Station Main Site in 2020, now a communications site.


Sundance AFS Main Site with PM1 Nuclear Power Plant (bottom of picture).

Established in 1960 as Sundance Air Force Station manned by the 731st Radar Squadron (SAGE). The Air Force Station was located on four different sites along Warren Peak Road (Hwy 208) near the City of Sundance, Wyoming. The main site was located on Warren Peak itself while the housing area and the cantonment area were located at the base of the peak. The radio site was located beyond the main site still on Warren Peak Road.

Initial radar equipment included the FPS-7C search radar and FPS-6 and FPS-26 height-finder radars. Primary electrical power on the main site was provided by an experimental one-of-a-kind PM-1 transportable nuclear power plant which also provided steam heat for the main site. The PM-1 reactor installation began in June 1961 and the power plant was dedicated on 18 Sep 1962.

The site and the unit initially came under the command of the 29th Air Division at Malmstrom Air Force Base and the Malmstrom Manual Direction Center P-83 but the site was not yet operational. The additional testing required for the power plant contributed to a delayed operational date.

Sundance AFS Main Site Plan from Reactor Study.

SAGE System Transition

The transition of the site into 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.

SAGE System Operation

Minot SAGE Direction Center DC-19 Repurposed.
Sundance SAGE Direction Centers & Sectors
Assigned Direction Center Sector
1 Dec 1960 - 1 Jan 1961 Malmstrom Manual Direction Center P-83 29th Air Division
1 Jan 1961 - 25 Jun 1963 Minot SAGE Direction Center DC-19 Minot Air Defense Sector
25 Jun 1963 - 1 Apr 1966 Sioux City SAGE Direction Center DC-22 Sioux City Air Defense Sector
1 Apr 1966 - 18 Jun 1968 Sioux City SAGE Direction Center DC-22 30th Air Division

The site began operation as a SAGE System site on 1 Nov 1962 initially feeding data to the Minot SAGE Direction Center DC-19. With the deactivation of the Minot SAGE Direction Center in 1963, Sundance AFS began feeding data to the Sioux City SAGE Direction Center DC-22.


The Sioux City SAGE Direction Center DC-22, Sundance AFS, and the 731st Radar Squadron (SAGE) were all deactivated on 18 Jul 1968. The closure of the site took some time, not only to remove the radar and radio equipment but because of the required decontamination and precautions taken with the nuclear reactor.

Physical Plant

The physical plant of the site was divided into the main site, a cantonment area, a housing area, and a radio site.

Sundance AFS Recreation Hall in the Cantonment Area, 2020.
Sundance AFS Cantonment area Motor Pool & Snow Plow Storage in 2020.

The main site housed the operations buildings, the radar towers, backup generators, and uniquely, a nuclear power plant. The PM-1 transportable nuclear power plant was installed at Sundance as a test of the feasibility of powering remote radar sites with nuclear power. The PM-1 generated 1,000 KW of high-quality electrical power and 7,000,000 Btu's per hour of steam used to heat the buildings. Testing delayed the operational date of the site until 1962 and necessitated a special team of reactor operators in a 24-7 operation.

Sundance AFS GATR Site remains, just two slabs survive in 2020. The pool on the large slab provides water for stock and wildlife. The Radar Station Main Site can be seen in the background.
Sundance AFS Housing Area in 2020. Homes are now privately owned.

A separate Ground to Air Transmitter/Receiver (GATR) radio site north of the main site housed the radio equipment for directing aircraft intercepts.

The cantonment area housed the enlisted barracks, the bachelor officer's quarters, the orderly room, the dining hall, the motor pool, and other support buildings.

Just south of the cantonment area was a small 27 unit housing area for critical married personnel. The Cantonment Area and the Housing Area were directly adjacent. The housing area originally had just 9 units that were constructed on-site as a part of the original site plan. In 1963, 18 additional units were built on-site from prefabricated packages designed to be relocatable should mission needs change.

Sundance AFS Major Equipment List
Search Radar HF Radar Data Systems
Unit Designations
  • 731st Radar Squadron (SAGE) (1960-1968)
731st Radar Squadron (SAGE) Assignments

Sundance Air Force Station Partial Commanders List (edit list)
Assumed Relieved Rank Name Cullum Notes
1961-05~ 1963-08~ Lt Colonel Hamilton, Marvin C. N/A
1963-08~ 1966-04-29 Lt Colonel Hartley, Hubert C. N/A
1966-04-29 1967-09~ Lt Colonel DeBruler, Jasper D. N/A
1967-09~ 1968-07~ Lt Colonel Gross, Stanley N/A

Current Status

The main site has been repurposed with communications facilities and fenced off. The cantonment area and the housing area are under private ownership.

Location: Warren Peak near Sundance in Crook County, Wyoming.

Maps & Images

Lat: 44.47871 Long: -104.45167

  • Multi Maps from ACME
  • Maps from Bing
  • Maps from Google
  • Elevation: 6,600' (Main Site)

GPS Locations:

See Also:


  • Cornett, Lloyd H. & Johnson, Mildred W., A Handbook of Aerospace Defense Organization (1946-1980), Office of History ADC, Peterson AFB, Colorado, 31 Dec 1980, 179 pages, Pdf, page 162.
  • Winkler, David F., Searching the Skies: the Legacy of the United States Cold War Defense Radar Program, USAF Hq Air Combat Command, 1997, 192 pages, Pdf, page 169.
  • Record of Decision, Former Sundance Air Force Station, PM-1 Reactor Site Off-Site Release, Sundance, Wyoming, Ellsworth Air Force Base, South Dakota, Prepared By the United States Air Force September 2011, Pdf
  • USGS Geographic Names Information System (GNIS) Database Entry: 2090210


Visited: 5 Jun 2020

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