This looks to be the Ponderous borer, one of Oregon's largest insects, and the inspiration to the modern cutting tooth on a chainsaw. It is not a pest but aids in "turning over" dead trees, logs, etc.

https://osubpp.com/plant-clinic/meet-the-ponderous-borer/#:~:text=The%20ponderous%20borer%20is%20probably%20the%20largest%20beetle,a%20long-horned%20beetle%20%28named%20for%20the%20long%20antennae%29.

Wyatt Williams
Aug. 5, 2021, 2:46 p.m.