Sparrevohn Air Force Station

Sparrevohn Air Force Station (AAC ID: F-15, LRR ID: A-06) is a closed United States Air Force General Surveillance Radar station. It is located 356 mi southwest of Fairbanks, Alaska.

The ground control intercept (GCI) station was closed on 1 November 1983, and was re-designated as a Long Range Radar (LRR) site as part of the Alaska Radar System. Today, it remains active as part of the Alaska NORAD Region under the jurisdiction of the 611th Air Support Group, Elmendorf AFB, Alaska.

History
Sparrevohn AFS was a continental defence radar station constructed to provide the United States Air Force early warning of an attack by the Soviet Union on Alaska.

Construction of the station, began in January 1953 and was completed in October 1955. The Army Transportation Corps undertook the project. The radar station site was located on the summit at 3,400' (top camp), with a ground support station on a slight ridge between 1,600 and 1,800' at the base of the summit 61.09722°N, -155.58083°W. Access to the radars was initially by a road built up the side of the mountain, later a cable tramway was built. The tramway cables were constantly breaking because of high winds and ice, and fog and the extreme cold made repairs hazardous. Ice 16 inches thick built up on the cables in winter.

The station was one of the most difficult to construct, and one of the most expensive in Alaska. All supplies and equipment initially had to be disassembled then the pieces parachuted to the site by aircraft; and many times the equipment landed in wilderness instead of the clared base site area. Bears were a hazard and the initial construction crew had to winter over in the sub-zero environment in hastily-constructed quanset huts; working in the elements. In the spring of 1955, Army engineers constructed a 4,000 ft gravel runway airstrip 61.09917°N, -155.57472°W adjacent to the base site, which allowed transports to bring in supplies, equipment and other material directly without the need for airdrops by parachute.

The station consisted of a power/heating plant, water and fuel storage tanks,  gymnasium and other support office buildings. Two other buildings contained living quarters, work areas, and recreational facilities plus opportunities for such sports as skiing, skating, horseshoes, and basketball. The station buildings were, except for the civil engineering building connected by heated hallways. As a result, personnel stationed there, with only very few exceptions, were able to wear "summer" uniforms year round, unless they had a need to go outside during the winter season. The coverings of the station's three radar towers were heated from within to keep the covering from becoming brittle from extreme cold, and thus subject to being damaged or destroyed by high winds. Tours at the station were limited to one year because of the psychological strain and physical hardships.

The 719th Aircraft Control and Warning Squadron, activated in March 1954 operated AN/CPS-5 AN/CPS-4 AN/FPS-3, AN/FPS-20A and AN/FPS-66 radars at the top site. The top site was a mini-station by itself, where twelve airmen lived; two radio maintenance, nine radar maintenance, and the most important person the cook. Barracks were connected between the radomes. Between the domes were other barracks rooms and the dayroom/library/kitchen/movie theater.

The station operated as a long-range surveillance radar station which provided information 24/7 to the air defense Direction Center at King Salmon AFS where it was analyzed to determine range, direction altitude speed and whether or not aircraft were friendly or hostile. An AN/FYQ-9 Semiautomatic Data Processing and Display System was installed and became operational in July 1965, eliminating the need to pass track data manually.

Communications were initially provided by a high frequency radio system which proved unreliable because of atmospheric disturbances. The Alaskan Air Command, after investigating various options, decided to build the White Alice Communications System, a system of Air Force-owned tropospheric scatter and microwave radio relay sites operated by the Air Force Communications Service (AFCS). The Tatalina site 61.12°N, -155.59222°W was activated in 1957. It was inactivated in 1979, and replaced by an Alascom owned and operated satellite earth terminal as part of an Air Force plan to divest itself of the obsolete White Alice Communications System and transfer the responsibility to a commercial firm.

Over the years, the equipment at the station was upgraded or modified to improve the efficiency and accuracy of the information gathered by the radars. In 1983, Sparrevohn received a new AN/FPS-117 minimally attended radar under Alaskan Air Command's Seek Igloo program. It was designed to transmit aircraft tracking data via satellite to the Alaskan NORAD Regional Operations Control Center (ROCC) at Elmendorf AFB.

No longer needed, the 719th ACWS was inactivated on l November 1983 and the station re-designated as a Long Range Radar (LRR) Site. This left only contractor personnel to maintain the site radar. In 1990, jurisdiction of the Sparrevohn LRR Site was transferred to Eleventh Air Force with the re-designation of AAC.

In 1998 Pacific Air Forces initiated "Operation Clean Sweep", in which abandoned Cold War stations in Alaska were remediated and the land restored to its previous state. After years of neglect the facilities at the station had lost any value they had when the site was closed. The site remediation was carried out by the 611th Civil Engineering Squadron at Elmendorf AFB, and remediation work was completed by 2005.

Current status
Today very little of the former Sparrevohn Air Force Station remains. The site is controlled by the Pacific Air Forces 611th Air Support Group, based at Elmendorf AFB. Contractor access to the site to support the FPS-117 is by the Sparrevohn LRRS Airport.

It is generally unattended, A few civilian contractors access the site for maintaining the facilities. and a new ground support structure was erected on the site of the former bottom camp for storage of equipment, vehicles, and for brief overnight stays by support personnel.

Air Force units and assignments
Units:
 * 719th Aircraft Control and Warning Squadron, 1958–1983

Assignments:
 * 11th Air Division