As a pre-fabricated structure it also took less time to construct and was cheaper than a conventional steel and concrete building, says Liddell.

CNN: Can wooden skyscrapers transform concrete jungles?

At a news conference, Inslee said federal officials were looking for a pre-fabricated structure to replace the 160-foot section that fell into the river.

NPR: Feds Look For Temporary Fix After I-5 Collapse