"We're going to keep on looking," Hood County Sheriff Roger Deeds said Thursday. "We're not going to give up until every piece of debris is turned over."
The tornadoes hit the area Wednesday and left six people dead, CNN reported. At least 16 others were hospitalized with injuries.
Survey teams from the National Weather Service were in the area Friday, assessing the damage. Many homes were ripped from their foundations.
One survey team found damage indicating that at least one of the tornadoes that stuck Wednesday was an EF4, the second-most severe classification on a scale of 0 to 5.
Ronna Cotten, a local resident, said she was told she would not be able to "check to see if we have any belongings left" for at least two days, maybe as many as seven. She also said power is expected to be down for about three weeks.
Nonetheless, Cotten said she considers herself fortunate because she and her family survived he storm.
"I feel very lucky because we are alive," she said.