Titan I 568-C Missile Silo Larson AFB Washington

Overview

Titan I Missile Complex 568-C was the western launch complex in the three-site Titan I field controlled by the 568th Strategic Missile Squadron at Larson Air Force Base. It lay in Grant County's Royal Slope farming country, south of Quincy and west of Royal City. Three HGM-25A Titan I missiles, their underground launchers, control center, powerhouse, radio-guidance antennas, propellant terminals, equipment terminals, utilities, and crew spaces formed one-third of Larson's nine-launcher T-4 force.

The installation has unusually strong site-specific visual evidence. A historical photograph published by the Air Force Historical Foundation identifies Titan I missile 60-3704 raised at Silo 3, Site C, Royal City during a training exercise. The image shows the elevated missile, 115-ton closure doors, service tower, flame-bucket extension, and a worker for scale. It is rare direct evidence of a particular Larson complex rather than a generic Titan I site.

The postmilitary record is equally distinctive. After deactivation, salvage, and federal disposal, the underground plant filled with water. Historical and contemporary accounts describe controlled visits and technical dives into parts of the flooded installation. That use preserves a direct connection to the surviving launcher cribwork and tunnels, but it must not be translated into an assumption of open public access. Exact 2026 ownership, operator arrangements, entry permission, and dive availability were not verified from a current owner or permitting authority.

Federal records identify the property as Larson AFB Titan I Missile Facility S-3, FUDS property F10WA0351, FFID WA09799F332000, and EPA ID WAN001002636. EPA places it outside the National Priorities List and assigns NFRAP status. Department of Defense reporting records one hazardous and toxic waste project at final response complete before fiscal year 2017. Those are administrative environmental findings, not structural inspections, dive-safety certifications, ownership records, or permission to enter.

Installation Identity, Location, and Boundaries

The identity identity is Titan I Missile Complex 568-C Its parent is Larson Air Force Base. Air Force-related sources also use Larson Missile Site 3, Site C, Complex 3C, Royal City, Quincy, PIN 6988, and Larson AFB Titan I Missile Facility S-3. These names describe one physical military installation from operational, geographic, property, and environmental viewpoints.

The representative project point is 46.907711 north latitude and -119.755886 west longitude. It closely matches published Titan I coordinate compilations and community dive-site mapping for the visible complex west of Royal City. EPA lists 46.899027 north latitude and -119.629927 west longitude together with T16N R24E Section 1. That EPA point lies materially east of the recognized missile-complex footprint. The history retains both values, labels the difference, and does not silently average them.

The representative point is used for historic identification because it corresponds with the observable installation pattern and established missile-site references. EPA's point remains important as the agency's regulatory locator. Neither is a surveyed acquisition boundary, legal parcel corner, entrance, dive route, sampling location, ownership statement, or safety instruction.

No verified acquisition acreage, current parcel acreage, or deed was located. General accounts often describe Titan I complexes as occupying roughly 40 to 60 acres, but those estimates may refer to a fenced operational compound, fee-owned parcel, or later private holding.

Grant County's current road-program map labels a Titan Missile Base on Road 12 SW near Royal City. That official local-government reference confirms the continuing landscape identity of the former installation, but it is not a property survey or access authorization. The installation remains a distinct former military site within the wider agricultural landscape.

The Quincy / Royal City Landscape

Complex 568-C occupied the Royal Slope, a broad plateau of irrigated agriculture between Quincy and Royal City. The open terrain and separation from urban concentrations suited Strategic Air Command's requirement to disperse the nine Larson launchers among three hardened complexes. Wide separation reduced the chance that a single attack could destroy the entire field.

The landscape also imposed demanding logistics. Alert crews, security personnel, maintenance teams, replacement parts, food, fuel, and test equipment moved over rural roads between Larson Air Force Base and a remote site. Hot summers, winter cold, wind, dust, irrigation, and groundwater affected construction and maintenance. Once government pumping ended, water became a defining feature of the abandoned underground complex.

The place names require care. Air Force and historic sources often call the complex Quincy, while EPA and many later accounts call it Royal City. The representative point lies south of Quincy and west of Royal City, so both geographic labels are useful. Neither name means that the installation stood within the developed center of either city.

Larson supplied command, housing, personnel administration, training, logistics, maintenance coordination, and other wing support. The remote complex generated emergency power and could sustain protected alert duty, but it was not an independent air base. Its history belongs both to the separate installation and to the wider Larson field.

The Larson T-4 Field

The Larson program was known as Titan Base T-4. The Army Corps of Engineers opened a Larson area office in October 1959 to administer nine silos at three dispersed complexes and supporting work at Larson Air Force Base. Oversight transferred to the Corps of Engineers Ballistic Missile Construction Office in October 1960 as the national missile program centralized schedule, engineering, and contractor control.

The field contained three standardized three-launcher complexes. 568-A served the Batum and Odessa sector, 568-B the Warden sector, and 568-C the Quincy and Royal City sector. Together they provided nine launchers for the 568th Strategic Missile Squadron. The arrangement spread the retaliatory force across a broad area while retaining common training, communications, maintenance, logistics, and command.

Larson's Titan mission existed alongside B-52 and KC-135 operations at the parent base. The 4170th Strategic Wing initially supported the missile squadron, and the 462d Strategic Aerospace Wing assumed the relationship on February 1, 1963. Aircraft and missile missions shared the parent installation but occupied very different operating environments. Royal City was a remote nuclear alert complex whose underground machinery and command procedures differed sharply from ordinary airfield operations.

No reviewed source proves that 568-C was the unnamed first Larson complex declared operational on July 16, 1962. The date remains a field-wide milestone. The controlled squadron milestones are the September 26 turnover and operational date in Air Force records and the September 28 Headquarters Strategic Air Command declaration. Preserving that distinction avoids false site-specific precision.

Design, Contracting, and Construction

Bid packages for the Larson complexes opened on November 18, 1959. The low bid, approximately $31.6 million for the principal field construction, came from a joint venture of MacDonald Construction Company, The Scott Company, Paul Hardeman, G. H. Leavell, F. E. Young, and Morrison-Knudsen. The figure covered the group program rather than 568-C alone. Later contracts supplied specialized systems, including propellant-loading equipment, and the final field cost necessarily extended beyond the initial construction bid.

Field construction began December 1, 1959. Work used a cut-and-fill method: contractors excavated immense pits for the central plant and launcher branches, built reinforced concrete and structural-steel facilities in the open, installed heavy equipment, then backfilled and restored a comparatively sparse surface. The work required exact coordination among civil, structural, mechanical, electrical, communications, guidance, ventilation, hydraulic, and propellant specialists. A small alignment error could interfere with a missile elevator, blast door, tunnel joint, pipe run, or cable system.

Water was a major Larson-field problem. By August 1961 one of the three sites was pumping approximately 175,000 gallons a day. The source does not identify which complex experienced that rate, so the figure cannot be assigned specifically to 568-C. Improved drainage reduced the problem at field scale. The episode nevertheless shows why drainage galleries, pumps, sumps, waterproofing, and groundwater control were vital to an installation whose most important spaces lay far below grade.

The Larson project recorded no worker deaths, but its initial lost-time accident rate was about twice the national average for comparable construction. The program added a full-time safety engineer, and the rate later fell below the comparable average. These field-wide facts describe the pressure and risk of a fast missile-building program without inventing a site-specific accident record for 568-C.

The rapid schedule also created a moving technical target. Titan I was still being developed while operational sites were built. Changes in missile equipment, blast criteria, elevators, doors, guidance, communications, propellant handling, safety interlocks, and acceptance tests could force rework. Concrete completion therefore did not equal combat readiness. The finished structures had to receive government-furnished equipment, missile-support machinery, command systems, and trained crews before acceptance.

Standard Underground Design and Surface Layout

No complete site-specific measured drawing of 568-C was located. Its documented three-launcher role and membership in the standardized Larson field permit the use of established Titan I engineering as a strong analogue, but not as a claim that every dimension or later alteration at Royal City matched another surveyed complex. The accompanying layout graphic is therefore labeled representative standard configuration and not a 568-C as-built survey.

The underground plant centered on a protected access route, launch control center, powerhouse, utility spaces, antenna terminal, and connecting junctions. The control center housed command consoles, status displays, communications, authentication materials, and crew working space. The powerhouse held diesel generators and electrical distribution equipment so the site could operate after losing commercial power. Ventilation, cooling, water, sewage, compressed air, and hydraulic systems supported both the weapon and the people assigned to it.

Three launcher branches extended from the central area. Each branch incorporated an equipment terminal, a propellant terminal, connecting tunnels, and a missile silo. The equipment terminal supported the launcher elevator and associated machinery. The propellant terminal handled RP-1 kerosene fuel and liquid oxygen equipment. The silo contained the missile on a large elevator beneath paired doors. Titan I could not launch from inside the silo. It had to be fueled, raised into the open, and fired from the surface.

Two retractable guidance antennas occupied protected antenna silos. Titan I carried inertial instruments but relied on radio corrections transmitted from the ground during early flight. Redundant antennas reduced the risk that a single failure would prevent guidance support. Their presence explains why a Titan I complex contained multiple large shafts in addition to the three missile silos.

Surface features included security fencing, access and patrol roads, launcher doors, antenna doors, vents, hatches, utility structures, orientation and survey features, drainage works, and support areas. Salvage, private reuse, weather, standing water, and environmental investigation may have changed many of those elements.

The HGM-25A Titan I was a two-stage liquid-propellant missile approximately 98 feet long. Both stages burned RP-1 kerosene and liquid oxygen. A nuclear reentry vehicle gave the missile its strategic effect, while engines, airframe, inertial components, radio guidance, communications, and launch equipment came from a national contractor network. At 568-C, these elements operated as one system. The missile could not fulfill its mission without the site's power, oxidizer plant, elevators, doors, antennas, crew, and authenticated command link.

Liquid oxygen governed readiness. Its extremely low temperature and continual boil-off prevented long-term storage aboard the missile, so the launch sequence included oxidizer loading. Crews treated oxygen equipment as surgically clean because oil, dirt, or incompatible material could cause fire or explosion. HAER interviews describe cleanliness standards below 150 microns, pressurized clean rooms, vapor degreasing, caustic cleaning, black-light inspection, and repeated checks. Liquid nitrogen, high-pressure nitrogen and helium, diesel fuel, hydraulic fluid, lubricants, batteries, and other industrial materials added more hazards.

Propellant Loading Exercises tested every missile on a roughly 90-day cycle, which meant approximately one exercise each month at a three-launcher complex. The procedure forced operations and maintenance personnel to verify tanks, pumps, lines, valves, sensors, timing, and emergency actions under conditions approaching a real countdown. These exercises were essential because Titan I's deterrent value depended on machinery that normally remained idle. They also placed sustained demands on the environmental, safety, and waste-handling systems later examined during cleanup.

A launch order required authenticated messages and controlled cooperation by trained crew members. Once the sequence began, the system loaded liquid oxygen, checked missile and site status, opened the selected silo doors, raised the missile on its elevator, deployed a guidance antenna, and completed ignition preparations. The three missiles could be launched in sequence. Titan I was dramatically faster than an aircraft-delivered weapon, but the fueling and elevation process left it more exposed and slower to respond than the later Titan II and Minuteman systems that launched directly from closed, fueled or solid-propellant silos.

Site Activation and Acceptance

The Corps of Engineers turned the three completed Larson complexes to the Site Activation Task Force on March 16, 1962. Titan missiles had begun arriving from Denver on January 23. Activation teams installed, checked, calibrated, and exercised systems that construction contractors had placed in the underground plants. Federal Electric Corporation, a service associate of International Telephone and Telegraph, supported Martin with installation and testing of missiles and ground equipment, interim operation, contractor support, and turnover assistance.

A contemporary Air Force Magazine advertisement photographed a Larson Titan Base T-4 activation scene. It is valuable because it shows real equipment and personnel from the correct missile field in 1962. The caption does not name a particular complex, so this history does not present it as a photograph of 568-C. It documents the shared activation program at Larson and illustrates the contractor-intensive transition from construction to Air Force control.

The first Larson complex was declared operational on July 16, 1962, but the official narrative reviewed here does not say whether it was 568-A, 568-C, or 568-C. Assigning that date to Royal City would create false precision. The controlled squadron milestone is September 26, when the 568th completed turnover and became operational according to the official Air Force milestone table and unit history. A Strategic Air Command chronology gives September 28 as the date headquarters declared the squadron operational. The two dates describe different command actions and are retained rather than forced into one.

Organization and the 568TH Strategic Missile Squadron

The Air Force redesignated and activated the 568th Strategic Missile Squadron on October 24, 1960 and organized it at Larson on April 1, 1961. The squadron was initially assigned to the 4170th Strategic Wing. It transferred to the 462d Strategic Aerospace Wing on February 1, 1963. Its weapon system was the SM-68, later designated HGM-25A, Titan I.

The squadron operated all three complexes as one combat organization. A particular alert crew worked at an individual site, while squadron leaders, maintenance organizations, security forces, communications systems, and parent-wing resources connected the entire field. Nine launchers did not mean nine independent commands. The complexes had local control and self-contained support, but authenticated orders and readiness accountability flowed through Strategic Air Command.

Personnel required recurring training in console operations, emergency procedures, propellant safety, electrical and hydraulic systems, communications, security, and nuclear command and control. Maintenance specialists had to understand how a defect in one subsystem affected the whole launch sequence. The early missile force depended on skilled human monitoring because many functions that later became automated still required extensive testing, alignment, servicing, and procedural control.

Alert Operations

Alert duty combined routine checks with readiness for an event of extraordinary consequence. Crews monitored status lights, communications, environmental controls, electrical systems, security reports, and missile condition. They maintained logs, ran prescribed tests, and followed two-person control procedures. Security forces controlled entry and patrolled the surface, while maintenance teams responded to equipment discrepancies without compromising nuclear surety.

The underground complex was designed to continue functioning after outside utilities failed. Diesel generation, stored supplies, filtered ventilation, protected communications, and hardened access supported survivability. Hardening did not make the installation invulnerable. Its dispersal, burial, blast-resistant construction, redundancy, and rapid launch sequence together sought to preserve retaliatory capability long enough to deter attack.

Titan I's cryogenic design placed a special burden on alert operations. Liquid oxygen could not remain indefinitely in the missile. A launch order would initiate a controlled sequence involving authentication, system checks, propellant loading, guidance preparation, silo-door operation, elevator movement, and surface launch. The need to raise the missile left the weapon exposed during the final sequence, one reason later Titan II and Minuteman systems emphasized in-silo launch and more readily stored propellants.

The radio-guidance system linked the missile to protected ground antennas. Inertial instruments provided basic navigation, while ground equipment calculated and transmitted corrections during early flight. That arrangement demanded reliable electronics, precise surveying, communication among subsystems, and functioning antenna machinery. Guidance was not an accessory. It was part of the operational weapon system.

The Cuban Missile Crisis

The squadron reached operational status just weeks before the Cuban Missile Crisis of October 1962. The timing placed the new Larson force on alert during the most dangerous confrontation of the Cold War. Official sources establish the squadron's operational status and the national alert environment, but the records reviewed do not provide a surviving 568-C crew log or a site-specific narrative of those days.

The significance therefore lies in confirmed readiness rather than invented drama. Men at Royal City maintained a live intercontinental ballistic missile installation while national command authorities confronted Soviet missile deployment in Cuba. Communications, authentication, security, mechanical reliability, and disciplined adherence to procedure all carried immediate strategic importance. The site's purpose was deterrence, and the crisis tested whether that deterrent could be presented as credible without being used.

Communications, Guidance, Power, Security, and Maintenance

Reliable communications connected the remote complex to squadron and Strategic Air Command channels. Emergency Action Messages required authentication and controlled handling. Two-person procedures reduced the possibility that one individual could initiate critical actions. Exact equipment complements changed during construction and service, and no complete 568-C communications inventory was located, so standard Titan I functions are described without assigning an unsupported model number to every rack or circuit.

The powerhouse served as the site's mechanical heart. Multiple diesel generators, switchgear, batteries, hydraulic equipment, ventilation, pumps, and cooling systems allowed the complex to support missile readiness independent of ordinary utilities. Machinery also created maintenance demands and potential environmental sources. Fuels, lubricants, solvents, electrical components, sumps, drains, and wastewater systems later became part of the broader environmental inquiry at former missile sites.

Security began with remoteness, fencing, controlled gates, alarms, patrols, identification procedures, and armed response. It continued underground through protected portals and controlled areas. Modern private ownership and the visibility of large surface doors do not erase those historic layers, but neither do they make the site safe to enter. Deep shafts, decayed floors, unguarded openings, poor air, standing water, electrical remnants, and contaminated media can turn curiosity into a fatal hazard.

Maintenance was continuous because Titan I combined cryogenic propellant systems, high-pressure gases, mechanical elevators, heavy doors, guidance electronics, power generation, ventilation, and early command equipment. A failure in one component could remove a launcher from alert. Preventive maintenance, periodic tests, parts supply, contractor support, and disciplined documentation were as essential to readiness as the missile itself.

Phaseout and Deactivation Titan I entered service as a first-generation operational ICBM and was overtaken quickly by systems that could remain fueled, launch from within a silo, and operate with fewer people. In May 1964 the national phaseout schedule accelerated. The short lifespan did not make the Larson investment meaningless. Titan I trained organizations, crews, engineers, and contractors in dispersed ICBM operations and helped establish the procedures used by later forces.

The 568th removed its first missile from alert on January 4, 1965 and its last on February 2. The last missile left the squadron on February 8, and the unit inactivated March 25. Those milestones are squadron-wide. Available sources do not identify the exact day each individual 568-C launcher left alert or the order in which the three complexes were emptied.

After deactivation, missiles went to Norton Air Force Base and contractors removed much aerospace ground equipment, including diesel generators. The sites passed to the General Services Administration for open-market disposal. Equipment removal and salvage did not eliminate the reinforced shafts, tunnels, terminals, and major concrete structures. The government was disposing of specialized real property whose underground volume and hazards made ordinary redevelopment difficult.

Disposal, Salvage, and Private Ownership

After the 568th Strategic Missile Squadron inactivated, the Air Force removed the missiles and contractors removed much aerospace ground equipment. The three Larson complexes entered General Services Administration disposal and private ownership. The National Park Service and Department of Defense inventory records the Quincy Site 3 as privately owned after salvage, with its underground structure remaining.

Water entered the abandoned underground plant after active pumping and maintenance ceased. HistoryLink reports that the Quincy and Royal City complex became flooded and was used by highly skilled divers. Later accounts describe a controlled technical-diving environment in the flooded launcher areas and tunnels, while some dry portions remained accessible under arranged supervision. These descriptions document postmilitary use at particular dates, not perpetual public availability.

The surviving launcher cribwork is a major reason 568-C became noteworthy among former Titan I sites. First-person historical accounts describe the tall steel structure inside a launcher, access through former personnel and escape routes, and water-filled passages leading toward the launchers. Such accounts are useful for understanding survival and reuse, but they are not engineering inspections and should not be used as navigation instructions.

Scott Murdock photographed the exterior in October 2015 and identified the property as Larson Air Force Missile Site 3, PIN 6988. The images show a gated private site, posted signs, fencing, paved access, dry grass, and equipment or stored material on the surface. They verify exterior appearance at that date. They do not establish present ownership, legal access, underground condition, or current use.

No current deed or owner statement was retrieved. The correct present description is therefore historically private, physically surviving in substantial part, flooded below grade, and associated with controlled technical diving. It should not be described as abandoned public property, an unrestricted dive attraction, or a site safe for entry.

Environmental Registration and Response

EPA identifies the property as Larson AFB Titan Missle Facility S-3, preserving the misspelling in the official listing, with EPA ID WAN001002636. The live profile places it in Grant County at Royal City, identifies EPA Region 10, records that it is not a federal facility, and lists it as not on the National Priorities List. Its non-NPL status is NFRAP, meaning the site did not qualify for NPL listing based on the information used in the assessment.

The Formerly Used Defense Sites property number is F10WA0351 and the federal facility identifier is WA09799F332000. The 2015 FUDS inventory records one hazardous and toxic waste project under the Northwestern Division and Kansas City District. A 2001 General Accounting Office table described the property as eligible and not Department of Defense-owned, with one project and approximately $7,000 in then-reported cost columns.

Department of Defense reporting through fiscal year 2017 listed Larson AFB Titan I Missile Facility S-3 among FUDS properties that achieved final response complete before fiscal year 2017. The table recorded one Installation Restoration Program site, about $23,000 in costs through fiscal year 2017, and no remaining cost. This is the strongest reviewed evidence for the endpoint of the federal restoration project.

The 2001 and 2017 cost figures are snapshots from different reporting dates and should not be treated as contradictory. They show that additional federal expenditure was recorded after the earlier GAO compilation. Neither amount is a total construction cost, property value, private maintenance cost, or estimate of future structural work.

EPA NFRAP and Department of Defense final response complete answer particular environmental-program questions. They do not certify that deep shafts, flooded tunnels, air spaces, corroded steel, electrical remnants, debris, or access routes are safe. They do not establish the water's suitability for diving, current ownership, public access, or the absence of every contaminant.

Surviving Features and Current Status

The most important surviving feature is the underground three-launcher plant. Published descriptions and dive accounts indicate that water fills substantial portions of the launchers and connecting spaces while some upper or separated areas have remained dry enough for controlled access. The launcher cribwork, tunnels, control spaces, antenna areas, powerhouse, and service passages together preserve the scale of a first-generation hardened ICBM complex.

The 2015 exterior photographs show a gated and posted property rather than an open historic park. Surface remnants visible in the images include fencing, the entrance road, utility or ventilation structures, and stored equipment. They do not disclose the condition of doors, hatches, ladders, floors, pressure doors, electrical systems, confined-space air, or submerged structures.

Technical diving at 568-C has been described for more than a decade, and an Oregon Scuba Club program in January 2026 advertised a presentation about a member's Royal City silo dive. This supports the continuing historical memory of organized diving. It does not prove that commercial dives were offered on any particular later date or that an individual may arrive without an explicit arrangement.

Flooded overhead environments combine darkness, depth, entanglement, disorientation, limited exits, submerged steel, silt, and uncertain structural conditions. Former missile installations add shafts, confined spaces, industrial residues, and private-property restrictions. The history records these hazards only to explain why a geographic coordinate or historical dive account is not an invitation or a safety endorsement.

The safest current description is a privately disposed former Titan I complex with substantial surviving underground works, extensive flooding, documented historic technical-diving use, a gated surface property, EPA NFRAP status, and a completed FUDS environmental-response project. Exact ownership, operational arrangements, access, and 2026 structural condition remain unverified.

Detailed Chronology

• 1955 The Air Force selected Martin's Titan proposal as a second intercontinental ballistic missile program.
• 1958 National planning moved Titan I toward dispersed hardened operational deployment.
• October 1959 The Army Corps of Engineers opened its Larson area office for the T-4 field.
• November 18, 1959 Larson field construction bids were opened.
• December 1, 1959 Principal construction of the Larson field began.
• October 1960 Construction oversight transferred to the Corps of Engineers Ballistic Missile Construction Office.
• October 24, 1960 The Air Force redesignated and activated the 568th Strategic Missile Squadron.
• April 1, 1961 The 568th Squadron was organized at Larson Air Force Base under the 4170th Strategic Wing.
• August 1961 One unidentified Larson site was pumping about 175,000 gallons of water per day; the source does not identify 568-C as that site.
• January 23, 1962 Titan missiles began arriving at Larson from Denver.
• March 16, 1962 The Corps turned all three Larson complexes to the Site Activation Task Force.
• April 1962 Air Force Magazine documented Federal Electric Corporation activation work at Larson Titan Base T-4.
• July 16, 1962 The first Larson complex was declared operational; the source does not identify which complex.
• September 26, 1962 Official Air Force and unit-history records mark squadron turnover and operational status.
• September 28, 1962 Headquarters Strategic Air Command declared the 568th Squadron operational according to SAC chronology.
• October 1962 The operational Larson Titan force stood alert during the Cuban Missile Crisis.
• February 1, 1963 The 568th Squadron was assigned to the 462d Strategic Aerospace Wing.
• 1963 or 1964 A training exercise raised Titan I missile 60-3704 at Silo 3, Site C, Royal City; the reviewed photograph does not supply a more precise date.
• May 1964 The national Titan I phaseout schedule accelerated.
• January 4, 1965 The first 568th Squadron missile came off alert.
• February 2, 1965 The last 568th Squadron missile came off alert.
• February 8, 1965 The last squadron missile was shipped from the Larson field.
• March 25, 1965 The 568th Strategic Missile Squadron and all three Larson complexes were officially inactivated.
• 1965 and after Missiles went to Norton Air Force Base, ground equipment was removed, and the complexes entered General Services Administration disposal.
• By the early 2000s The Royal City underground plant was widely documented as flooded and associated with controlled technical diving.
• 2001 A GAO table listed Larson S-3 as FUDS property F10WA0351, eligible, not Department of Defense-owned, with one project and about $7,000 in then-reported costs.
• October 17, 2015 Scott Murdock photographed the gated exterior and identified the installation as Larson AF Missile Site 3, PIN 6988.
• 2015 The FUDS inventory listed one hazardous and toxic waste project for the Royal City property.
• Before fiscal year 2017 Department of Defense reporting classified the single FUDS project as final response complete.
• Fiscal year 2017 Department of Defense reporting showed about $23,000 in cumulative Installation Restoration Program costs and no remaining cost for S-3.
• May 25, 2018 EPA's FOIA log recorded requests for reports, documents, and photographs concerning all three abandoned central Washington Titan I bases, including Site C Royal City.
• 2024 The Air Force Historical Foundation published the verified Site C launch photograph and detailed caption in a special Titan issue.
• 2025 Scott's installation record was reformatted and retained the 2015 568-C exterior photographs and PIN 6988 identification.
• January 8, 2026 Oregon Scuba Club scheduled a presentation about a member's dive at the Royal City Titan I complex.
• 2027 planning map Grant County labeled Titan Missile Base on its Road 12 SW gravel-to-oil project map.

Sources & References

• PDF National Park Service and Department of Defense, To Defend and Deter: The Legacy of the United States Cold War Missile Program Larson T-4 contracting, construction, field chronology, phaseout, disposal, Site 3 location, private ownership, salvage, and launcher inventory
• PDF Air Force Historical Research Agency, 568th Strategic Missile Squadron lineage and history Unit activation, organization, assignments, weapon system, turnover, operational, alert-withdrawal, shipment, and inactivation dates
• PDF Office of Air Force History, Ballistic Missiles in the United States Air Force, 1945-1960 Official program origins, acquisition context, and early Titan development
• PDF Strategic Air Command, Missile Chronology 1939-1988 Headquarters SAC operational declaration of September 28, 1962 and broader missile-force chronology
• PDF Air Force Magazine, April 1962, Titan Base T-4 activation advertisement Contemporary Larson-field activation photograph and Federal Electric Corporation support role
• PDF Air Force Historical Foundation, Journal of the Air Force Historical Foundation Titan special issue Site-specific photograph and caption for Titan 60-3704 raised at Silo 3, Site C, Royal City
• WEB National Park Service, Titan Intercontinental Ballistic Missile Standard Titan I underground configuration, weapon operation, launch sequence, and program interpretation
• WEB National Museum of the United States Air Force, Martin Marietta SM-68A/HGM-25A Titan I Missile designation, propulsion, dimensions, performance context, and operational history
• WEB Association of Air Force Missileers, Titan I Standard three-by-three squadron configuration, underground operating concept, and alert-force context
• WEB U.S. Environmental Protection Agency, Larson AFB Titan Missle Facility S-3 site profile EPA ID, public-land-survey locator, Grant County, agency coordinate, non-NPL NFRAP status, Region 10, and non-federal-facility designation
• PDF U.S. Army Corps of Engineers, 2015 Formerly Used Defense Sites Inventory for Washington FUDS property F10WA0351 and the single hazardous and toxic waste project
• PDF Department of Defense, Properties Achieving Final Response Complete Before Fiscal Year 2017 FFID WA09799F332000, one completed Installation Restoration Program site, reported cumulative cost, and zero remaining cost
• WEB U.S. General Accounting Office, Formerly Used Defense Sites in Washington 2001 FUDS eligibility, non-Department of Defense ownership, project count, and then-reported cost columns
• WEB HistoryLink, Intercontinental Ballistic Missiles in Washington State Washington field context, federal disposal, private ownership, flooding, and historical skilled-diver use at Quincy and Royal City
• WEB Scott's USAF Installations Page, Totally Titan 2015 site-specific exterior photographs, Larson Site 3 identity, PIN 6988, gate, fencing, and posted condition
• WEB Grant County, Road 12 SW Gravel to Oil Program map Official local-government map labeling the Titan Missile Base near Royal City
• WEB City of Othello, Othello History Timeline Local-government acknowledgment that Titan missile sites were constructed at Royal City, Warden, and Batum
• WEB Oregon Scuba Club, January 2026 meeting notice Recent public program documenting a member presentation about a Royal City Titan I silo dive