Boundary Substation Heliport

The specific reason is not officially documented, as this was a private utility heliport, not a public facility. Closure is presumed to be for operational and economic reasons by its operator, Seattle City Light. Likely factors include: a shift to more modern and cost-effective inspection methods for power lines and dam infrastructure (such as the widespread adoption of drones), a reduced need for a permanently registered heliport, or the consolidation of aviation support services at other regional airports.

The site is an active and integral part of the Boundary Substation, which is owned and operated by Seattle City Light as part of the Boundary Hydroelectric Project. Satellite imagery of the coordinates shows extensive electrical substation equipment, control buildings, and access roads. While there is no longer a formally marked or registered heliport, open, flat areas within the secure facility could potentially be used for occasional helicopter landings on an as-needed, private basis.

The heliport's significance is entirely functional and tied to the Boundary Hydroelectric Project, which it served. Located adjacent to the project's main substation, the heliport was a critical logistical asset, particularly during and after the dam's construction (completed in 1967). It was used for transporting personnel, specialized equipment, and supplies into the rugged and remote terrain of the Selkirk Mountains. Its primary operations would have involved supporting the maintenance and inspection of the dam, the powerhouse, and the vast network of high-voltage transmission lines originating from the facility.

There are no known plans or public prospects for reopening the Boundary Substation Heliport as an officially registered aviation facility. The operational requirements of Seattle City Light are likely met through more flexible and modern solutions. It is highly improbable that it will be reinstated with its former ICAO identifier.