Historic Milestone: Hughes H-4 Hercules Rejoins National Register in Oregon

The Hughes H-4 Hercules, widely celebrated for its aviation innovations, holds the unique distinction of being the only aircraft individually listed in Oregon’s National Register of Historic Places.

According to the State of Oregon, the National Park Service approved the aircraft’s inclusion after the State Advisory Committee on Historic Preservation nominated it for this honor.

Despite completing just one flight on November 2, 1947, the H-4 Hercules made significant contributions to aviation, including pioneering the use of Duramold wood composite materials and advancements in fire suppression and flight control systems.

The aircraft’s journey to its current location has been eventful. Initially listed on the National Register in 1980, it was delisted after being moved to Oregon without pre-approval from the National Park Service.

The H-4 remained in storage in Long Beach, California, until it was transferred to McMinnville in 1992. After its reassembly in 2001, the iconic plane found a permanent home at the Evergreen Aviation & Space Museum, where it continues to inspire visitors.

Being listed in the National Register recognizes the historical significance of properties like the Hughes Flying Boat at the national, state, or community level.

These sites are eligible for federal preservation grants, tax benefits, and special protections under state law, which requires local governments in Oregon to enforce regulations supporting historical conservation.

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