AirIndex Research · FAA LID WN84

LOWER MONUMENTAL DAM

KAHLOTUS, WA. Operational · Private use.

OperationalPrivate usePublic

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Data integrity

50/100
Self-reportedData Integrity Index
Independent inspection
Owner self-reported — never independently field-inspected
Location confidence
⚠ Location-suspect — recorded coordinates may be mislocated
Terrain cross-check (USGS 3DEP)
FAA 465 ft MSL · USGS ground 484 ft · Δ -19 ft
Structure cross-check (Overture / OSM)
Ground-level — no building footprint at the coordinate
Cross-source consensus
Single independent source — no corroboration available

Cross-checked against independent public data — USGS 3DEP terrain, Overture/OSM building footprints, the federal hospital registry, and measured dimensions. The State of the U.S. Heliport Record →

eVTOL readiness

INFEASIBLE WITHOUT REMEDIATIONConversion feasibility · four readings, one line each
Obstruction screen
Severe
High obstacle within 0.5 nm conflicts with the expanded footprint and the 8:1 approach surface.
Geometry
Meets the FATO footprint
Recorded pad side 200 ft against a 100 ft eVTOL FATO.
Structural FATO
Unverified
The full 100 × 100 ft FATO must be load-bearing. The FAA does not record structural capacity, so no record can confirm it.
Overall
Infeasible without remediation
A high obstacle conflicts with the expanded footprint. Remediation or a different site.
100 ft · eVTOL FATO200 ft
This pad already covers the eVTOL landing footprint as it stands.
recorded pad eVTOL FATO
Recorded pad (limiting side)
200 ft
eVTOL FATO required
100 ft
FAA EB-105 vertiport pattern — 2× a ~50 ft eVTOL controlling dimension, plus a 125 ft safety-area side.
Load-bearing FATO
100 × 100 ft must be structural
No heliport precedent — typically the binding gate for rooftop and hospital pads.

Measured against FAA pad geometry and federal FATO sizing (EB-105). The obstruction screen is the only reading the engine verdict rests on; geometry and structural capacity are stated separately and never folded into it. A dimensional pre-screen — site-level validation required, and independent of the underwriting risk score.

FAA compliance

Q1 · FAA registrationPASS
Active FAA NASR 5010 record.
Q2 · Airspace determinationUNKNOWN
FAA OE/AAA airspace determination data integration pending.
Q3 · State enforcementMODERATE
State has partial enforcement framework.
Q4 · NFPA 418UNKNOWN
NFPA 418 adoption status not yet assessed for this jurisdiction.

FAA facility data

FAA LID
WN84
AIX ID
aix:hp:FVM3GACC
Lat / Lng
46.56193, -118.54595
Elevation
465 ft MSL
Pad dimensions
200 × 200 ft
Surface type
ASPH
Activation date
1987/09
Last owner update
2025/10/30

FAA OEAAA airspace determinations0

No FAA OEAAA determinations linked to this facility.
Blueprint
The record vs. what we measured
50/100
DATA INTEGRITY
eVTOL footprint
FATO 100 ft reqHTLOF 200 ft

Footprint assessment available.

SIGNALFEDERAL RECORDMEASURED
Surface elevation465 ftnot cross-checked
Structurenot on recordGround-level
Pad dimensions200 ft side (filed)200 ft side · measured
Coordinate integrityas filed⚠ location-suspect
Independent inspectionowner self-reportednone on record
Federal record
Cross-checkedUSGS · Overture · dimensions
3Physically verifiedGround Truth capture
Obstructions, exact FATO geometry, surface condition, and downwash exposure require a physical Ground Truth capture — not shown above as measured. A field verification completes the record and writes the measured truth to this facility’s authority.
Request Ground Truth verification

Full risk assessment

This page is the public data-integrity record. The full RiskIndex assessment — Q1–Q5 compliance, dimensional / FATO analysis, an underwriting-grade risk score, peer benchmark, and a sealed Site Intelligence Report — is available on request.

Request the full assessment

Building autonomous systems? See the machine-verified feed

Provenance FAA NASR 5010 · pad dims APT cycle 2026/03/19 · USGS 3DEP terrain · Overture structure · eVTOL screen conversion-feasibility-1.1 · AIX-ID aix:hp:FVM3GACC · Methodology →
Cite this facility

LOWER MONUMENTAL DAM, KAHLOTUS, WA (FAA WN84). AirIndex facility record aix:hp:FVM3GACC. Verifiable at https://www.airindex.io/verify/aix:hp:FVM3GACC.

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