The bus remained upright and appeared to have plowed through a roadside snowbank, knocked down a mile marker, and crashed into woods along the road before coming to rest pointing down an embankment.
"He hit pretty high up on the tree, you can see marks," Beardsley said.
The bus was owned by the John T. Cyr & Sons Inc. bus line of Old Town, Maine. A man who answered the phone at the company's office late Tuesday said company officials were gathering information and had notified their insurance carrier.
UMaine Athletic Director Steve Abbott told WHDH-TV in Boston that it was "quite a traumatic ride" and that although passengers were shaken up none were seriously hurt. He said the university has used the bus company extensively and found it to be a "terrific carrier."
A state police car that stopped at the scene was struck by another car. The trooper who had been driving it was taken to a hospital with what appeared to be minor injuries, police said. Police said the driver of the car was not hurt.
Earlier this month, a bus crash in Boston injured 35 people, including high school students and chaperones, from Pennsylvania. The coach slammed into a 10-foot-high overpass on Feb. 2 while returning to the Philadelphia area from a trip to Harvard University.