A Corrections Department statement on Saturday said regular visiting will resume on Sunday.
The facility was placed on lockdown Thursday after fighting among about 30 inmates erupted at the dining hall. No one was hurt so badly as to require treatment outside the prison.
Officials say an investigation is ongoing to determine the cause of the incident.
The penitentiary is Oregon’s oldest prison and the only maximum security prison among 14 institutions. It houses about 2,000 people.
Oregon prison officials have reported several instances of inmate fighting in 2014.
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