An Oregon woman has been freed after spending more than four hours trapped in a tight space between two buildings.

Anita Mann was rescued by firefighters, who cut two holes in the cement wall of a parking garage and used a soap-like substance to free her.

"That last couple feet, she had that look of determination and I think we were all pretty convinced no matter what, she was coming out that way," said firefighter Rich Chapman.

It is still unclear how the 30-year-old fell into such a tight space, but she has since been taken to hospital for evaluation.