Both crossings were closed earlier in the day when ice began falling from the top of bridge structures onto cars and smashing windscreens.

BBC: Snow latest across the UK

Overall, they found that 53% of the failures came during floods, when raging waters undermine bridge footings or batter the structures with debris.

NPR: Study Answers Question of Why Bridges Collapse

The temporary fix is a four-lane span consisting of two 24-foot-wide structures to replace the collapsed portion of the bridge and allow drivers to cross the river at reduced speeds.

WSJ: Crumpled Bridge in Washington State to Get Temporary Fix

Sydney's summer sun has disappeared under a blanket of smoke so thick at times that iconic structures such as the Sydney Opera House and the harbour bridge could not be seen from the city centre, and flights have had to be diverted to other places.

ECONOMIST: Arson suspected

Like many of the other bridges on the Federal Highway Administration's list of structures that need to be monitored, inspected, and repaired, thousands of people rely on this bridge to get to work and school and to deliver goods every day.

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