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With a loud boom, 4.5 million pounds of steel fell into the Missouri River Tuesday. The last two sections of the westbound Blanchette Bridge in Saint Charles, Missouri were destroyed in a planned demolition. (CNN/KTVI)

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Updated: Wednesday, 05 Dec 2012, 7:33 AM EST
Published : Tuesday, 04 Dec 2012, 2:09 PM EST

ST. CHARLES, Mo. (CNN) - With a loud boom, 4.5 million pounds of steel fell into the Missouri River Tuesday.

The last two sections of the westbound Blanchette Bridge in Saint Charles, Missouri were destroyed in a planned demolition.

About a thousand people gathered to watch the spectacle.

It's part of a $63 million project to rehabilitate the 54-year-old bridge. About three-quarters of the bridge will be replaced or rehabilitated.

The westbound span is expected to reopen by fall 2013.