Police say the two patrons were successfully able to disarm the man and stop him by grabbing the shotgun and hitting him in the face with it.
Other patrons helped tackle the man while others filed outside.
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Skyland Pub in Troutdale, Oregon (Google Earth)
The suspect has been identified as 39-year-old Arturo Michel-Apolinar who police say is facing charges that include menacing and unlawful use of a weapon.
Court records show that Michel-Apolinar was released from jail on Friday.
The downtown skyline and the Broadway Bridge are viewed in the early morning in Portland, Oregon (George Rose/Getty Images)
The suspect is said to be the only person who was injured during the incident.
The sheriff's office said that they recovered the shotgun at the scene.
The Multnomah County Sheriff's Office did not immediately respond to a request for further comment from Fox News Digital.