The story

Federal regulators said support plates that were about half as thick as they should have been were the likely cause of the August 1, 2007, bridge collapse in Minnesota that killed 13 people and injured 145.

The gusset plates -- metal plates that are meant to strengthen joists -- are believed to have failed on the I-35W bridge over the Mississippi River in Minneapolis, Minnesota, causing the collapse, according to the National Transportation Safety Board.

There were 111 vehicles on the portion of the bridge that collapsed, dropping them 108 feet into the 15-foot-deep river. Read full article »

All About I-35W Mississippi River BridgeU.S. National Transportation Safety Board

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