Two weeks into the Korean War, a memo went up the chain. The Secretary of the Air Force wanted permission to stop waiting. The radar network strung across the United States at that point was a temporary thing, improvised and thin, and on 11 July 1950 the Air Force asked the Secretary of Defense for approval to build the permanent one in a hurry. The answer came back ten days later: yes. Buried in the paperwork that followed was a patch of Whatcom County farmland five and a half miles south of Blaine, Washington - close enough to the Canadian border that the men posted there would spend the next twenty-seven years watching a sky where, if anything ever came, it would come over the pole and down through British Columbia first.
The 757th Aircraft Control and Warning Squadron was constituted on 14 November 1950 and activated at Paine Field two weeks later, which is to say it existed as a unit before it existed as a place. Its future home was still farmland. The squadron moved north to Birch Bay on 15 August 1951, and by January 1952 it had a pair of AN/FPS-10 radars turning. Blaine was one of twenty-eight stations built in the second segment of Air Defense Command's permanent network, a ring of eyes bolted onto the continent's edges. The site took its final name on 1 December 1953, when Birch Bay AFS became Blaine Air Force Station - a small bureaucratic act that fixed the place in the record under the name of a border town it could not quite see.
A Ground-Control Intercept station had one essential job: sort the sky, then act on the sorting. Search radar told you that something was out there and roughly where. Height-finder radar told you how far up. Put the two together and you had a track, and if the track could not be accounted for, the squadron vectored interceptors toward it. In 1959 the station traded up, installing an AN/FPS-20 search set alongside AN/FPS-6 and AN/FPS-6A height-finders. The equipment changed. The rhythm did not. Somebody sat with the scopes at three in the morning, through winter fog rolling off Birch Bay and through the long bright evenings of a Pacific Northwest July, watching for the one contact that would justify everything. It never arrived. That was, by every measure that mattered, the point.
In 1960 the station stopped being a place where men made the call and became a sensor in something much larger. Blaine joined the Semi Automatic Ground Environment - SAGE - feeding its data to Direction Center DC-12 at McChord Air Force Base, where computers filling entire floors resolved range, direction, altitude and speed into a picture of the continent. On 1 April 1960 the unit was redesignated the 757th Radar Squadron (SAGE). By 1963 it was running an AN/FPS-24 search radar and an AN/FPS-26A height-finder, and on 31 July of that year the site was given the designation it would carry through the rest of the Cold War: NORAD ID Z-46. An unmanned AN/FPS-14 gap filler down at Anacortes, coded P-46A, plugged the low-altitude hole radar always leaves near the horizon. The ground-to-air transmitter and receiver site sat about three miles east, separate so its signals would not blind the antennas that mattered.
On 1 February 1974 the parenthetical fell away and the unit became simply the 757th Radar Squadron. Five years later it ended. The 757th was inactivated on 30 March 1979, part of the dismantling of Air Defense Command and the general drawdown of the radar stations it had built in such a rush a generation earlier. Blaine was not singled out. Missiles had made the bomber-warning fence less urgent, newer systems covered more ground with fewer people, and the arithmetic caught up with dozens of sites at once. The antennas stopped turning. The airmen went elsewhere. What remained was a small compound of hardened buildings on high ground, aimed at a threat that had rearranged itself while nobody at the scopes was looking.
Much of the station survived, which is unusual - most Cold War radar sites were stripped to slabs. The redevelopment that Wikipedia still describes in the future tense has long since happened. Whatcom County Parks and Recreation now runs the grounds as Bay Horizon Park, listing it among the county parks where families go for the playground. The plan had always been a camp, conference and recreation center rather than a demolition, and the bones of the base made that possible: buildings built to last, roads already graded, a clearing already cut. Children run across ground that was fenced, posted and watched around the clock for twenty-seven years. It is the quietest imaginable ending for a place designed around the possibility that the sky would one day fill with something terrible.
Located at 48.913N, 122.734W, on high ground about five and a half miles south of Blaine, Washington and roughly two miles inland from Birch Bay. Best viewed at 3,000-5,000 ft AGL. Navigate by the crescent of Birch Bay itself, Semiahmoo Spit and Drayton Harbor to the northwest, and the Peace Arch border crossing on the coast at the 49th parallel; Mount Baker stands about 30 nm east-southeast as the dominant reference. Nearest airports: Bellingham International (KBLI) roughly 11 nm southeast, Abbotsford (CYXX) about 16 nm east-northeast, Vancouver International (CYVR) about 25 nm northwest, and Paine Field (KPAE) - where the 757th was first activated - about 63 nm south-southeast. Marine layer and low stratus are common off the Salish Sea in summer mornings and through much of the winter; the site is often obscured when Bellingham reports low IFR.