We slowly made our way down a long hill and up the back nine to the trailer where we would load our carts with ice and beverages and a few snacks.

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An initial investigation shows the 1, 111-foot-long bridge collapsed when a tractor-trailer hauling an oversized load hit one of the bridge's overhead tresses, according to Deborah Hersman, chairwoman of the National Transportation Safety Board, which is investigating the incident.

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Sligh told KOMO he was traveling south on the interstate behind the tractor trailer when he realized the load appeared to be about four feet too wide to fit through the bridge's superstructure.

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Uovo's indoor loading bay, for example, is designed to accommodate a wide-load tractor-trailer, and artworks as large as 40 feet long can be carried straight off the truck into a large-scale storage space.

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The tractor-trailer was hauling a housing for drilling equipment southbound when the top right front corner of the load struck several trusses on the north end of the bridge, the patrol said.

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