A faulty heater was determined to be the cause of smoke that led to the Wasco County Courthouse being evacuated on Wednesday. The Wasco County Sheriff’s Office says the smoke was detected on the third floor of the building at about 8:50 a.m. The Wasco County Sheriff’s Office, The Dalles Police Department, and Mid-Columbia Fire and Rescue did an investigation, and found the source of the smoke was a faulty heater. People were allowed to return to the building about 40 minutes after it was cleared.