Interstate 5 in Seattle. WSDOT data shows around 16,000 trucks per day use this section making it the backbone of the West Coast freight corridor. I-5 stretches about 1,380 miles from the Mexican border at San Ysidro to the Canadian border near Blaine, Washington. | Dean Croke

Here's a look at the closure of the northbound lanes of I-5 over the Ship Canal Bridge in Seattle. | KING 5