WALLA WALLA—The Washington State Penitentiary is experiencing a COVID-19 outbreak in one of the housing units. In response to the outbreak, officials have developed a plan to keep inmates and staff safe.

As of Tuesday, the prison had 121 confirmed COVID cases, with 53 of those cases currently active. The facility houses a total of 2,284 incarcerated individuals. Ten Washington State Penitentiary (WSP) employees have tested positive.

The coronavirus outbreak began in late July when an inmate began displaying symptoms consistent with COVID-19. The housing unit was placed on quarantine, an...