KPTV reported that sentence was handed down Monday in the fire that burned Crestline Elementary in February 2013.
The teen pleaded guilty in June to second-degree arson.
The Columbian has reported that Dylan Mork cooperated with investigators and was accompanied by his parents when he entered his plea.
Replacing the school has cost $22 million.
The teen’s lawyer says that while the boy admits to setting coats on fire, he never intended to burn down the school.
The three-alarm fire displaced 500 students. The replacement school is scheduled to open in September.
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