Thunderbird reports in Oregon
2 cases, best-documented first. Page 1 of 1.
We map claims, not creatures. A case is what some source says someone saw or heard, with the link to that source. It is not proof that anything was there, and a retelling counts once, not as a second sighting.

Thunderbird · Oregon
Witness reports seeing a large black bird with a 25-30 foot wingspan flying above a hill while driving in Oregon.

Thunderbird · Warm Springs, Oregon · 1941
Oregon Indians were amazed by a motorized Thunderbird (an autogyro) flown by government workers to spray insecticide on crickets.