One person is dead after barricading himself inside a house on the 1100 block of Mt. Hood Street in The Dalles for about four hours, and the house eventually was severely damaged by fire that produced thick black smoke  Oregon State Police Lieutenant Pat Shortt said as fire crews worked throughout the structure a single fatality was discovered.  The name of the deceased person is being withheld pending notification of next of kin.  Shortt said the incident began around 8:25 a.m. on Monday when deputies arrived at the house to serve civil papers on the resident living there, but had to back away when gunshots were heard.  Officers set up a perimeter around the house and attempted to negotiate with the occupant when smoke began to come from inside the residence.  Shortt says officers were never able to speak to the occupant at any time during the incident.  The Oregon State Police Arson/Explosives Section arrived on scene, and just before 12:30 p.m. drove an armored car to the house and called for the occupant to come out.  It was at that time the fire became intense.  Mid-Columbia Fire and Rescue crews used a ladder truck to drop water on the fire from above, and then crews were given the go-ahead to approach and attack the fire.  The Wasco County Sheriff’s Office is the lead investigative agency.  Colonel Wright Elementary School and St. Mary’s Academy were placed in a lockdown that was lifted in about two hours after it was determined there was no immediate threat to students or staff.