Grantham — A 28-year-old truck driver was injured and traffic was detoured on Interstate 89 southbound for almost 3 hours Tuesday after he fell asleep at the wheel and crashed into a guardrail, state police said.

Eric Dechellis, of Manchester, was driving a flatbed truck carrying lumber and scaffolding from Burlington to Bow, N.H., when he fell asleep and ran into the guardrail in Grantham around 11 a.m., a state police news release said.

His truck became hung-up on top of the guardrail, and both lanes were blocked by the wreck.

Dechellis, who works for New England Scaffolding Services of Bow, was taken to Dartmouth-Hitchcock Medical Center with non-life-threatening injuries, the release said.

Southbound traffic was detoured onto Exit 13 for almost 3 hours while authorities investigated and cleaned up after the accident.