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.

Fort Lawton Air Force Station Site with FAA Radar in Center and Army Command Post off to the Right. The center radome is the ARSR-1C while the other two radomes are USAF FPS-6 radars. Two Army FPS-6 height-finders can be seen on temperate towers. The USAF Operations building is in front of the right-hand radome. The FPS-26 has not yet been installed in this photo, dating it to between 1960 and 1962.


Established 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

McChord AFB Former SAGE Direction Center DC-12 and SAGE Combat Center CC-3 behind the F-4C Fighter Aircraft and FPS-26A Radar Antenna Static Displays.
Fort Lawton Direction Centers & Sectors
Assigned Direction Center Sector
1 Mar 1960 - Mar 1963 McChord SAGE Direction Center DC-12 Seattle Air Defense Sector

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-90DC

The 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 the first production model 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

Fort Lawton Air Force Station Site with FAA Radar

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 Fillers

Fort 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.

Fort Lawton AFS Gap Filler Radar Sites (edit list)
ADC NORAD Location State Type From To GPS Notes
RP-1C Z-1C Chehalis WA FPS-14, FST-1 1960 1963 46.554697,
Building Exists
Tower may still exist


Fort 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.

Fort Lawton AFS Major Equipment List
Search Radar HF Radar Data Systems
Unit Designations
  • 635th Aircraft Control & Warning (AC&W) Squadron (1960-1960)
  • 635th Radar Squadron (SAGE) (1960-1963)
635th Assignments
  • 1 Jan 1951 - Assigned at McChord AFB, WA, to the 505th AC&W Gp
  • 6 Feb 1952 - Transferred to the 25th AD
  • Jan 1953 - Transferred to the 4704th Def Wg
  • 8 Oct 1954 - Transferred to the 25th AD
  • 1 Mar 1960 - Transferred to Seattle ADS McChord SAGE Direction Center DC-12
  • 11 Jun 1960 - Redesignated from the AC&W Sq to 635th Radar Sq (SAGE)
  • abt Jun 1961 - Moved to Ft. Lawton AI, WA
  • Mar 1963 - Deactivated
  • 1 Jan 1973 - Reactivated at Dauphin Island AFS, AL assigned to the 20th AD
  • 1 Jul 1974- Inactivated
Composite plan of the U.S. Army, U.S. Air Force and FAA Air Defense Facilities at Fort Lawton.

Current Status

Operating 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 were demolished in 2008 and the USAF buildings and towers have also been removed leaving almost no trace. The circular foundation of one USAF FPS-6 tower still exists. The original FAA operations building and tower still exist and are in use.

Location: Discovery Park, Seattle, Washington.

Maps & Images

Lat: 47.6575 Long: -122.41306

See Also:


  • 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, 164.
  • 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 42, 155.
  • Morgan, Mark L. and Berhow, Mark A., Rings of Supersonic Steel: Air Defenses of the United States Army 1950-1979, Third Edition, Hole in the Head Press, Bodega Bay, 2010, ISBN 978-0-9761494-0-8, 358 pages
  • NORAD/CONAD, Historical Summary, Directorate of Command History, Office of Information Services Headquarters, North American Air Defense Command:
    • July- December 1957, pages 17-32
    • July-December 1958, pages 31-36
    • July-December 1958, pages 34-41 + Table 2 listing operational dates of control centers as of Feb 1960.


Visited: 20 May 2014

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