PORTLAND, Ore. — Two math majors at Reed College lost control of a massive snowball that rolled into a dorm, knocking in part of a bedroom wall.

There were no injuries, but college spokesman Kevin Myers said Friday it will cost $2,000 to $3,000 to repair the building.

The incident happened following a rare trio of snowstorms in Portland.

Students started building the giant snowball on a campus quad near the dorm. Urged by a crowd, the math majors tried to make the snowball as big as possible by rolling it down the sidewalk that goes past the dorm.

“And the ball just got away from them,” Myers said.

After escaping their control, the boulder-sized snowball rolled about 15 yards before slamming into Unit 7. Three students heard the smack and discovered the fractured bedroom wall.

Nobody weighed the snowball, but a maintenance worker who sliced it up for removal estimated it to weigh 800 pounds or more, Myers said.