Fort Lawton Air Force Station
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Fort Lawton Air Force Station (1960-1963) - A Cold War Air Force Radar Station first established in 1960 in Seattle, Washington. Relocated from McChord Air Force Base in 1960. Named Fort Lawton Air Force Station after the location. Initially assigned a Permanent ID of RP-1 and later a Sage ID of Z-1. Abandoned by the Air Force in 1963 but continued operation as Fort Lawton FAA Radar Site and is still active with updated CARSR radar equipment.
HistoryEstablished in 1960 as Fort Lawton Air Force Station manned by the 635th AC&W Squadron. The site was repositioned from its location on McChord Air Force Base to Fort Lawton in June 1960 as part of a joint FAA/USAF/U.S.Army operation to colocate and integrate long-range radar sites with U.S. Army Nike Missile Master command posts. Fort Lawton was one of six sites where new collocated facilities were to be built and one of three sites where the FAA would provide ARSR-1 search radars. USAF would provide a SAGE System interface with an FST-2 coordinate data transmitter and two height-finder radars and pending the activation of this SAGE System interface it would install GPA-37 consoles in the Army command post to provide a manual intercept capability. Initial equipment included the FAA ARSR-1C search radar and two USAF FPS-6A height-finder radars, an FST-2 coordinate data transmission system and the interim GPA-37 equipment. The U.S. Army NIKE Missile Master complex was located just east of the USAF site and two U.S. Army FPS-6 height-finder radars were placed in the USAF compound to support that operation. A USAF FPS-26A height-finder radar was installed just months before the site was closed. SAGE System Operation
The site began operation as a SAGE site on 11 Jun 1960 initially feeding the McChord SAGE Direction Center DC-12 at McChord Air Force Base. Fort Lawton Army Air Defense Command Post S-90DCThe U.S. Army Air Defense Command Post S-90DC became operational in February 1960 for Nike missile command-and-control functions in the Seattle area. The large command post building was located adjacent to the USAF Fort Lawton Air Force Station and initially housed an FSG-1 Missile-Master Nike Radar Direction Center and a USAF GPA-37. It was later equipped with the GSG-5(V) BIRDIE solid-state computer system. The command post shared radar video produced by the FAA ARSR-1 radar with the USAF FST-2 SAGE System coordinate data transmitter. The FST-2 sent target data into the SAGE System computer at the McChord SAGE Direction Center DC-12 at McChord Air Force Base. The SAGE Direction Center provided target assignments back to the NIKE command post. The command post ceased operation in 1974 as the NIKE System phased out. Fort Lawton FAA Radar Site The original FAA ARSR-1C radar was established on Fort Lawton in 1960 and upgraded over the years to the ARSR-1E configuration. The signal processor was also upgraded from the original FST-2 to the FYQ-47 Common Digitizer (CD) and finally to the Common Digitizer-2 (CD-2). All ARSR-1's were then upgraded to the Common ARSR (CARSR) radar configuration by the end of 2015. The CARSR has a 200-nautical-mile (370 km; 230 mi) range, and shares transmitter components and software with the FAA's newest airport surveillance radar the ASR-11. The CARSR upgrade also replaces the legacy Common Digitizer-2 (CD-2) signal processors and associated radar data interfaces.
Gap FillersFort Lawton AFS was responsible for the maintenance of one remote unattended gap-filler radar site. The gap-filler sites were placed in locations where the main search radar lacked coverage. These sites sent digitized radar target data directly to a direction center. Maintenance teams were dispatched from Fort Lawton AFS for regularly scheduled maintenance or when fault indicators suggested the site had problems. The Fort Lawton AFS gap-filler site is located on Crego Hill near Chehalis in Lewis County, Washington but little is known about its equipment or operation.
ClosureFort Lawton AFS and the 635th Radar Squadron were deactivated in March 1963. The Fort Lawton Army Air Defense Command Post S-90DC was deactivated in 1974. The FAA radar site continues to operate now with the CARSR Common ARSR radar set.
 Current StatusOperating as an unattended FAA CARSR radar site data tied to the FAA center and to the USAF Battle Control System-Fixed (BCS-F). All of the U.S. Army command post buildings and the USAF buildings and towers have been removed leaving no trace. The foundation of one USAF FPS-6 tower still exists. The original FAA operations building and tower still exist and are in use.
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Links: Visited: 20 May 2014
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