Owner self-reported — never independently field-inspected
Location confidence
⚠ Location-suspect — recorded coordinates may be mislocated
Terrain cross-check (USGS 3DEP)
FAA 322 ft MSL · USGS ground 289 ft · Δ 33 ft
Differential consistent with an elevated / rooftop pad
Structure cross-check (Overture / OSM)
Ground-level — no building footprint at the coordinate
Cross-source consensus
⚠ Sources conflict — FAA elevation sits above terrain, but no building is at the coordinate
Either a freestanding / tower pad or a mislocated coordinate — independent verification recommended.
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 →
The recorded pad is 20 ft short of the 100 ft footprint an eVTOL would need — shown to scale.
recorded pad eVTOL FATO
Recorded pad (limiting side)
80 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.
Obstruction clearance
High obstacle within 0.5 nm — conflicts with the expanded footprint and 8:1 approach
Measured against FAA pad geometry and federal FATO sizing (EB-105). A dimensional pre-screen — site-level validation required, and independent of the underwriting risk score.
NFPA 418 adoption status not yet assessed for this jurisdiction.
FAA facility data
FAA LID
WA53
AIX ID
aix:hp:S3X4W2PG
Lat / Lng
47.60281, -122.32468
Elevation
322 ft MSL
Pad dimensions
80 × 80 ft
Surface type
ASPH
Surface condition
FAIR
Activation date
1972/03
Last owner update
2023/09/05
FAA OEAAA airspace determinations2
Airspace clearance
On file as archived / procedural records — no standing clearance to track.
Filing activity
Most recent determination 1999-03-03
NRAARCH-DeterminedASN 1999-ANM-2032-NRA1999-07-07
Other · 0 ft AGL — 7480: ESTABLISH TEMPORARY HELIPORT WHILE PERMANENT HELIPORT IS BEING BUILT AND RELOCATED.
NRAARCH-DeterminedASN 1999-ANM-2033-NRA1999-06-28
Other · 0 ft AGL — 7480: RELOCATE HELIPORT.
Blueprint
The record vs. what we measured
50/100
DATA INTEGRITY
eVTOL footprint
The 80 ft pad is 20 ft short of the 100 ft an eVTOL FATO requires (measured).
SIGNALFEDERAL RECORDMEASURED
Surface elevation322 ftnot cross-checked
Structurenot on recordGround-level
Pad dimensions80 ft side (filed)80 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.
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.
HARBORVIEW MEDICAL CENTER, SEATTLE, WA (FAA WA53). AirIndex facility record aix:hp:S3X4W2PG. Verifiable at https://www.airindex.io/verify/aix:hp:S3X4W2PG.