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 teens 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.
More Northwest Headlines
Crash kills man, injures woman on I-90 in Snoqualmie Man charged with placing homemade bombs in Puyallup 2:10 p.m. Cooler weather helping Washington fire 3:28 p.m. Seattle City Council votes to adopt ‘gun violence tax’ 6:00 p.m. Sen. Marco Rubio in Washington state to raise money 5:14 p.m. Orca near San Juan Islands may have shaken fishing lure 5:13 p.m. State releases funds for 3 drought-relief projects Man saves grandson but needs rescue after kayak flips in Dungeness Bay
Our new comment system is not supported in IE 7. Please upgrade your browser here.