Atlas F Site 556-8 Missile Silo, Redford / Clayburg New York

Atlas F Site 556-8 is one of the rare Cold War places where the story did not end with abandonment. In the early 1960s, this wooded site near Redford and Clayburg, New York, hid a thermonuclear Atlas F missile in a vertical underground silo. After the missile age passed it became something almost surreal: a private airfield and underground residence, with a former launch-control structure adapted for living space and the access road serving as a runway. The same ground that was once arranged around blast doors, launch crews, liquid oxygen, armed security, and Strategic Air Command checklists later became one of the most widely publicized private Atlas silo conversions in the United States.

Atlas F Site 556-8 was a single-missile SM-65F Atlas intercontinental ballistic missile launch facility associated with Plattsburgh Air Force Base and the 556th Strategic Missile Squadron. It is best identified as Atlas F Site 556-8, Atlas S-8, or the Redford / Clayburg site. The former launch complex is in Clinton County, New York, near Redford and Clayburg in the Town of Saranac area.

The site is inactive, decommissioned, privately owned, and reused. Strategic Air Command chronology records the 556th Strategic Missile Squadron becoming operational on 1962-12-20 and the Atlas force phaseout ending for the squadron in 1965. Because Atlas F sites were self-contained vertical-silo launch complexes, 556-8 did not have a Minuteman-style remote parent Launch Control Center; the launch-control and support functions were part of the individual complex. The site is private property and is not open to the public.

Location, Landscape, and Site Description

Site 556-8 sits in northern New York in a wooded Adirondack / North Country setting near Redford and Clayburg. The former silo is in Clinton County west-southwest of Plattsburgh Air Force Base, not on the parent base itself. Its siting reflected the Atlas F concept of dispersal: each launch complex was separated from the base and from the other missiles so that a single attack would not necessarily destroy the entire squadron.

The original Atlas F complex was a hardened, single-missile vertical silo-launcher site. It included the missile silo, a two-level underground launch-control center / command building, an access tunnel, silo doors, elevator/launcher machinery, propellant and oxidizer support equipment, emergency power and environmental systems, communications, security fencing, access controls, and surface support structures. New York State Military Museum's Atlas-sites summary describes the general Plattsburgh Atlas F layout as a command building about 40 feet in diameter with two levels, a tunnel leading to a missile silo about 50 feet in diameter and approximately 185 feet deep, and an inner fenced area around the launch complex. That summary is not unique to 556-8, but it matches the Atlas F silo-launcher design used across the Plattsburgh field.

Post-military field observations make 556-8 unusually distinctive. The Frontiernet 556th Atlas F S08 page states that the site is privately owned and has been converted into a private airfield. It describes the view from the front gate, notes that the access road is now a runway, and identifies a building located over the launch control center. The same page reports that the launch control center had been remodeled into living quarters and that the missile silo had been adapted for storage. The Center for Land Use Interpretation identifies the reuse as Adirondack Estates Silo Home and describes a ranch-style surface house over the former underground launch control center, a two-level 2,300-square-foot subterranean structure connected to the silo by a roughly 50-foot tunnel, and a private airstrip called Adirondack Airpark.

Strategic and Cold War Context

Site 556-8 existed because the United States was trying to move nuclear deterrence from vulnerable bomber bases and exposed missile launchers into a harder, faster-reacting, geographically dispersed missile force. The Atlas F was the last operational Atlas ICBM variant. It stored the missile vertically underground in a hardened silo, then raised the missile to the surface for launch. This made the missile less vulnerable than the earlier Atlas D and Atlas E configurations while it was stored, though the missile still became exposed once it was elevated into launch position.

The Plattsburgh missile field was nationally unusual because it placed operational ICBMs in the northeastern United States. The 556th Strategic Missile Squadron's Atlas phase placed twelve Atlas F launch sites around Plattsburgh Air Force Base in New York and Vermont, these were the only ICBM facilities east of the Mississippi River. Site 556-8 was one of the New York sites, part of a ring of dispersed launch complexes that included Champlain, Alburg, Swanton, Willsboro, Lewis, Au Sable Forks, Riverview, Redford, Dannemora, Brainardsville, Ellenburg Depot, and Mooers.

Atlas F also illustrates why first-generation ICBM sites had short operational lives. The SM-65F Atlas could deliver a nuclear warhead across intercontinental ranges, but it remained a liquid-fueled missile. Its RP-1 fuel could remain aboard the missile during alert, but liquid oxygen was cryogenic and had to be loaded during the launch sequence. Solid-fueled Minuteman missiles, deployed almost immediately afterward, offered quicker reaction with far less fueling complexity. The Atlas F system was therefore both a major technological achievement and a transitional weapon whose active service ended after only a few years.

Construction and Activation

Construction of Site 556-8 began as part of the broader Plattsburgh Atlas F buildout in the early 1960s. The site was one of twelve independent Atlas F launch complexes built for the 556th Strategic Missile Squadron, supported by Plattsburgh Air Force Base and dispersed across northern New York and Vermont.

The missile assigned to Site 8 was General Dynamics manufacturing number 93F, General Dynamics serial number 62-12129, and Air Force tail number 129.

Official SAC chronology places the larger squadron milestones in sequence. Headquarters SAC activated the 556th Strategic Missile Squadron at Plattsburgh AFB on 1961-10-01, describing it as the last squadron in the Atlas program. SAC then declared the 556th Strategic Missile Squadron operational on 1962-12-20, completing deployment of the Atlas ICBM force.

Missile System and Technical Role

Site 556-8 housed an SM-65F Atlas missile in a hardened vertical silo-launcher complex. The Atlas F was a first-generation liquid-fueled ICBM built by General Dynamics / Convair. Public historical sources for the Plattsburgh Atlas F system state that the missile used RP-1 fuel and liquid oxygen, carried a General Electric Mark IV reentry vehicle with a W-38 thermonuclear warhead, and had a range of about 6,000 miles.

The Atlas F silo arrangement shaped the entire site. The missile remained vertical underground on an elevator/launcher. When launch procedures required it, the silo doors opened, the missile was raised, and final launch steps were completed after liquid oxygen loading and checkout. The local launch-control center was not a remote Minuteman-style LCC miles away; it was part of the individual Atlas F complex and was physically connected to the silo by a tunnel. The site was manned during its active period by launch crews and supported by maintenance, security, communications, and propellant-handling personnel from the squadron and parent base.

Atlas F alert posture requires careful explanation. When an Atlas F site was in an operational launch-ready alert posture, that did not mean the missile was continuously raised aboveground or continuously loaded with liquid oxygen. Under normal alert conditions the missile remained vertical inside the underground silo. RP-1 fuel could remain aboard, but liquid oxygen was loaded only during the launch sequence. A launch order would have set off a timed sequence involving crew authentication and actions, system checkout, liquid-oxygen loading, silo-door opening, missile raising, lock-in at the launch position, and final launch steps. If there was a short hold after the missile was raised, liquid oxygen could be topped off, but continuous raised or continuously LOX-loaded alert would have defeated the purpose of the silo and created operational problems because of the cryogenic oxidizer.

Operational History

Site 556-8 served during the short but intense operational life of the Plattsburgh Atlas F field. The 556th Strategic Missile Squadron had an unusual lineage. It had previously been associated with the SM-62 Snark missile program before being organized at Plattsburgh for Atlas F operations. By the Atlas period, the squadron was part of Strategic Air Command's effort to complete the first generation of operational ICBM deployments while newer Minuteman missile fields were already coming online.

The Plattsburgh Atlas sites were manned continuously while the squadron was active. In practice, that meant launch crews, maintenance teams, security personnel, and support specialists sustained an around-the-clock alert posture. Site 556-8's crewed underground control functions were part of the complex itself. The missile crews monitored status, maintained communications, and were prepared to execute authenticated orders under SAC procedures. Maintenance and propellant specialists had to keep a liquid-fueled, first-generation ICBM ready in the harsh northern New York climate, while security personnel protected an isolated nuclear launch facility in wooded terrain.

The Cuban Missile Crisis occurred while the 556th Strategic Missile Squadron was still being brought up to full operational status. All operational 556th sites were placed at a high level of alert during the crisis, and historical summaries of the squadron note that other Atlas F units supplied crews to help the 556th because Plattsburgh's missile force was still standing up.

The 556th Strategic Missile Squadron's operational record also included formal inspections and readiness evaluations. SAC Missile Chronology records that the SAC Inspector General conducted the first formal Operational Readiness Inspection of a Series F Atlas ICBM squadron at the 556th Strategic Missile Squadron from 1963-04-21 to 1963-04-26. That was a squadron-level inspection rather than an event documented specifically at Site 556-8, but it is significant because it placed the Plattsburgh field under SAC's readiness-evaluation system soon after the squadron became operational.

The site-specific assigned missile also had a documented later career. Atlas 93F, General Dynamics serial number 62-12129 and Air Force tail number 129, served as the Site 8 missile at Plattsburgh and later became an ABRES test vehicle. Its later launch from Vandenberg AFB, Gantry A-3, occurred on 1969-12-12, with an ABRES RMP-B14 reentry-vehicle test payload and a successful launch outcome.

Deactivation and Disposal

Site 556-8 left active missile service during the 1965 phaseout of the Atlas ICBM force. The squadron remained in the official SAC force structure until Headquarters SAC inactivated the last remaining Atlas squadrons on 1965-06-25, including the 556th Strategic Missile Squadron at Plattsburgh AFB.

The Atlas phaseout reflected a strategic and technical transition rather than an arms-control treaty demolition program. Atlas missiles were removed from alert because the Air Force was moving to newer solid-fueled Minuteman systems and phasing out first-generation liquid-fueled ICBMs. Publicly available Atlas deactivation documents describe the broader removal of specialized equipment, missile hardware, support systems, and surplus-property actions for Atlas E, Atlas F, and Titan I facilities. For Site 556-8, the available public sources do not provide a complete item-by-item record of equipment removal, propellant-system removal, sealing, sale, or transfer.

Environmental and FUDS records identify the former launch complex as PLATTSBURGH ATLAS S-8. The 2015 U.S. Army Corps of Engineers Formerly Used Defense Sites inventory lists PLATTSBURGH ATLAS S-8, property number C02NY0213, in Saranac, Clinton County, New York, with one CON/HTRW category site under the North Atlantic Division / New England District. Older Defense Environmental Restoration Program records identify PLATTSBURGH ATLAS S-8 with FFID NY29799F109900. ProPublica's DERP-derived New York table lists PLATTSBURGH ATLAS S-8 in Saranac, Clinton County, with highest risk shown as "Risk Not Evaluated or Not Required." DoD DERP Table 9 for properties achieving final response complete before FY22 lists PLATTSBURGH ATLAS S-8 / NY29799F109900 with one IRP site, no MMRP site, and costs incurred through FY22, indicating a response-complete listing in that table.

Current Status and Site Use

The former Site 556-8 launch complex at is decommissioned, inactive, privately owned, and reused. It is not an active military installation and is not a public museum. The site is best known today as a private silo-home / airpark conversion. Frontiernet describes the site as converted into a private airfield, with the access road functioning as a runway and the launch control center remodeled into living quarters. The Center for Land Use Interpretation describes the site as Adirondack Estates Silo Home, with a surface house over the former launch control center, a private airstrip known as Adirondack Airpark, and the silo extending to about 185 feet below the surface.

Public access should be treated as closed unless the current owner gives explicit permission. Former missile sites can contain confined-space hazards, fall hazards, standing water, unstable structures, old utility systems, and environmental concerns, and this particular site is a private residence/airfield rather than an abandoned public ruin.

Chronology

• 1960-09-24 Construction began on Site 556-8.
• 1961-10-01 Headquarters SAC activated the 556th Strategic Missile Squadron at Plattsburgh AFB as the last Atlas squadron in the program.
• 1962-09-21 / 1962-10-21 Sources conflict on the acceptance and delivery date for Atlas missile 93F, General Dynamics serial 62-12129 and Air Force tail number 129; the missile page lists 1962-09-21, while the Site 8 page lists 1962-10-21.
• 1962-10 During the Cuban Missile Crisis, operational 556th Strategic Missile Squadron sites were placed at high alert; the individual operational status of Site 556-8 on specific crisis dates is not verified in the public sources used here.
• 1962-12-20 Headquarters SAC declared the 556th Strategic Missile Squadron operational, completing deployment of the Atlas ICBM force.
• 1963-04-21 to 1963-04-26 The SAC Inspector General conducted the first formal Operational Readiness Inspection of a Series F Atlas ICBM squadron at the 556th Strategic Missile Squadron; this was squadron-level, not documented as specific to Site 556-8.
• 1964-11-19 Secretary of Defense Robert S. McNamara announced that remaining first-generation ICBMs, including Atlas systems, would be phased out by the end of fiscal year 1965.
• 1965-06-25 Headquarters SAC inactivated the 556th Strategic Missile Squadron at Plattsburgh AFB during the final Atlas ICBM squadron phaseout.
• 1969-12-12 The former Site 556-8 missile, Atlas 93F, was successfully launched from Vandenberg AFB, Gantry A-3, with an ABRES RMP-B14 reentry-vehicle test payload.
• 1991 The Center for Land Use Interpretation describes the Adirondack Estates Silo Home conversion as beginning in 1991.
• 2015-09-30 The USACE New York FUDS inventory listed PLATTSBURGH ATLAS S-8, C02NY0213, in Saranac, Clinton County, New York, under CON/HTRW.
• 2022 DoD DERP Table 9 listed PLATTSBURGH ATLAS S-8 / NY29799F109900 among properties achieving final response complete before FY22, with one IRP site and no MMRP site.

Plattsburgh history-office packet on Atlas Missile Deployment

Read about the Atlas at Plattsburgh AFB

All Atlas Missile Silo Locations