Fort Lawton Air Force Station

Defunct US airforce radar station

47°39′27″N 122°24′47″W / 47.65750°N 122.41306°W / 47.65750; -122.41306 (Fort Lawton AFS RP-1)TypeAir Force StationCodeADC ID: RP-1, NORAD ID: Z-1Site informationControlled by United States Air ForceSite historyBuilt1961In use1961–1963Garrison informationGarrison635th Aircraft Control and Warning Squadron

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Fort Lawton Air Force Station is a closed United States Air Force General Surveillance Radar station. It is located on Fort Lawton in the Magnolia neighborhood of northwest Seattle, Washington. The Air Force inactivated its unit in 1963; while the site remained under Army control until 1974. Today the Federal Aviation Administration (FAA) operates the site as part of the Joint Surveillance System (JSS).

The station was established at Fort Lawton, Washington on 1 April 1960 by Air Defense Command. The station was established as a consolidation of Army and Air Force radar units in the Seattle area due to funding reductions. Fort Lawton AFS was given the ADC designation "RP-1", as it replaced the radars at McChord AFB which were relocated as part of the consolidation. In addition, the station was a joint-use facility with the Federal Aviation Administration (FAA).

The Army established Army Air Defense Command Post S-90DC at the station for Nike missile command-and-control functions. The station was initially an AN/FSG-l Missile-Master Nike Radar Direction Center. It was later equipped with the AN/GSG-5(V) BIRDIE solid-state computer system. Among the Army air defense units operating in the area were the 26th Artillery Group (Air Defense) (1961–1966), 49th Artillery Group (AD) (1966–1974), 433d AA Battalion (1955–56), 4th Battalion, 4th Air Defense Artillery Regiment (1964–1972), and 1st Battalion, 4th ADA (1972–1974).^[1]

The Air Force 635th Aircraft Control and Warning Squadron worked jointly with Army radar controllers at the station. The site used an FAA ARSR-1C search radar and two Air Force AN/FPS-6A height-finder radars. (The Army also had 2 AN/FPS-6 variant height-finder radars of their own.) On 11 June, Fort Lawton AFS joined the Semi Automatic Ground Environment (SAGE) system, feeding data to DC-12 at McChord AFB. After joining, the squadron was re-designated as the 635th Radar Squadron (SAGE). The radar squadron provided information 24/7 the SAGE Direction Center where it was analyzed to determine range, direction altitude speed and whether aircraft were friendly or hostile.

In addition to the main facility, Fort Lawton operated an AN/FPS-14 Gap Filler site:

• Chehalis, WA (RP-1C/P-1C) 46°33′17″N 123°03′31″W / 46.55472°N 123.05861°W / 46.55472; -123.05861 (RP-1C/P-1C)

In late 1962, an AN/FPS-26 height-finder radar was installed. On 31 December 1962, Air Force moved the 635th RADS to Dauphin Island AFS, Alabama, however a detachment operated at Fort Lawton until March 1963. The Army continued operations at the site until the AADCP was inactivated 1 September 1974.

The Fort Lawton radar site remains in use by the FAA today, still operating the ARSR-1E search radar.

This image shows several types of radar systems, operated by several agencies, at Ft Lawton, WA. The two radars without radomes are US Army FPS-6 heightfinders; the radome with an open steel grid support structure is a search radar operated by the Federal Aviation Administration; the two radars with radomes and white clad support structure are US Air Force FPS-6A heightfinders; and the radome in the foreground with dark-clad support structure is a US Air Force FPS-26A, nearing construction completion here c. 1962.

• List of USAF Aerospace Defense Command General Surveillance Radar Stations
• List of United States Air Force aircraft control and warning squadrons

 This article incorporates public domain material from the Air Force Historical Research Agency

• A Handbook of Aerospace Defense Organization 1946–1980, by Lloyd H. Cornett and Mildred W. Johnson, Office of History, Aerospace Defense Center, Peterson Air Force Base, Colorado
• Winkler, David F. (1997), "Searching the skies: the legacy of the United States Cold War defense radar program". Prepared for United States Air Force Headquarters Air Combat Command.
• Information for Fort Lawton AFS, WA

• 635th, Fort Lawton, Seattle, WA – Abandoned Air Force Radar Sites on Waymarking.com
• Fort Lawton AFS, WA Recent Photos

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Aerospace Defense Command (ADC)

Bases

CONUS

Amarillo Beale Charleston Davis-Monthan Dobbins Dover Dow Duluth Eglin Edwards Ellington Ellsworth England Ent Ethan Allen Fairfax Fallon Fort Gregg-Adams Fort Heath Geiger George Glasgow Grand Forks Grenier Griffiss Gunter Hamilton Hancock Homestead Hurlburt Hunter Imeson Key West Kincheloe Kingsley Kirtland Lackland Laredo Larson Luke MacDill March Malmstrom McCoy McChord McClellan McGhee Tyson McGuire Minneapolis-St. Paul Minot Mitchel New Castle Niagara Falls Norton O'Hare Otis Oxnard Paine Perrin Peterson Pittsburgh Portland Presque Isle R.I. Bong Richards-Gebaur Robins K.I. Sawyer Selfridge Seymour Johnson Sioux City Stead Stewart Suffolk County Tinker Travis Truax Tyndall Vandenberg Vincent Walker Webb Westover Wright-Patterson Wurtsmith Youngstown

Overseas

Ernest Harmon Frobisher Bay Goose Keflavik McAndrew Pepperrell Thule

Stations

CONUS

Adair Aiken Almaden Alpena Antigo Arlington Heights Baker Bedford Bellefontaine Belleville Benton Blaine Brookfield Brunswick Bucks Harbor Burns Calumet Cambria Cape Charles Cape Cod Carmi Caswell Chandler Charleston Cheyenne Mountain Claysburg Clear Colville Condon Continental Divide Cottonwood Cross City Crystal Springs Curlew Custer Cut Bank Dallas Center Dauphin Island Dickinson Duncanville Eldorado Empire Finland Finley Flintstone Fordland Fort Fisher Fort Lee Fortuna Gettysburg Grand Marais Grand Rapids Guthrie Hanna City Havre Highlands Houma Hutchinson Joelton Keno Killeen Kingman Kirksville Klamath Lake Charles Lake City Las Cruces Las Vegas Lewistown Lockport Lufkin Lyndonville Madera Makah Mica Peak Miles City Mill Valley Minot Montauk Moriarty Mount Hebo Mount Laguna Mount Lemmon Naselle North Bend North Charleston North Truro Oklahoma City Olathe Omaha Opheim Osceola Othello Owingsville Ozona Palermo Point Arena Port Austin Port Isabel Pyote Red Bluff Rochester Rockport Rockville (Indiana) Roslyn Rye Saint Albans San Clemente Island Santa Rosa Island Saratoga Springs Sault Ste Marie Shemya Snelling Snow Mountain Sweetwater Texarkana Tierra Amarilla Thomasville Tonopah Topsham Two Creeks Wadena Walnut Ridge Watertown Waverly West Mesa Willow Run Winnemucca Winslow Winston-Salem Woomera Yaak Zapata

Overseas

Armstrong Baldy Hughes Beausejour Cape Makkovik Cartwright Cut Throat Island Elliston Ridge Fox Harbour Hofn Hopedale Kamloops La Scie Langanes Latrar Melville Puntzi Mountain Ramore Red Cliff Rockville Saglek St. Anthony Saskatoon Mountain Sioux Lookout Spotted Island Stephenville

Air
Defense
units

Forces	Central Air Defense Eastern Air Defense Iceland Western Air Defense First Fourth Tenth Fourteenth
Air Divisions	8th 9th 20th 21st 23d 24th 25th 26th 27th 28th 29th 30th 31st 32d 33d 34th 35th 36th 37th 58th 64th 73d 85th
Sectors	Albuquerque Bangor Boston Chicago Detroit Duluth Goose Grand Forks Great Falls Kansas City Los Angeles Minot Montgomery New York Oklahoma City Phoenix Portland Reno Sault Sainte Marie San Francisco Seattle Sioux City Spokane Stewart Syracuse Washington
Wings	Fighter 1st 4th 23d 32d 33d 50th 52d 56th 78th 81st 325th 328th 507th Detection and Control 71st 73d 551st 552d Air Defense 46th 4620th 4621st 4622d 4624th 4625th 4627th 4628th 4683d 4700th 4702d 4703d 4704th 4705th 4706th 4707th 4708th 4709th 4710th 4711th 4750th 4751st 4752d 4756th 4780th
Groups	Fighter 1st 4th 14th 15th 23d 32d 33d 50th 52d 53d 54th 56th 57th 78th 79th 81st 82d 84th 325th 326th 327th 328th 329th 337th 343d 355th 408th 412th 414th 473d 475th 476th 478th 507th Air Defense 10th 500th 501st 502d 503d 514th 515th 516th 517th 518th 519th 520th 521st 525th 527th 528th 529th 530th 533d 534th 564th 566th 567th 568th 575th 637th 665th 678th 692d 701st 751st 762d 765th 778th 780th 827th 858th 4606th 4620th 4676th 4700th 4721st 4722d 4727th 4728th 4729th 4730th 4731st 4732d 4733d 4734th 4735th 4750th 4756th Aircraft Control & Warning 503d 505th 540th 541st 542d 543d 544th 545th 546th 563d 564th 565th 566th
Squadrons	Aerospace Defense Command Fighter Squadrons Aircraft Control and Warning Squadrons

Major
weapon
systems

Electronic	TB-29 EB-57 EC-121
Fighters	Propeller: F-47 F-51 P-61 F-82 Subsonic Jet: P-80 F-84 F-86 F-89 F-94 Supersonic Jet: F-101 F-102 F-104 F-106
Missiles	AIM-4 AIM-26 AIR-2 CIM-10
Ships	Guardian Interceptor Interdictor Interpreter Investigator Locator Lookout Outpost Pickett Protector Scanner Searcher Skywatcher Tracer Watchman Vigil
Texas Towers	Texas Tower 2 Texas Tower 3 Texas Tower 4

Miscellaneous

• Air Defense Command Emblem Gallery (on Wikimedia Commons)
• General Surveillance Radar Stations