MoDot Officials say the work will start no later than November 1, 2012.
A woman is hospitalized after being pulled to safety.
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The project will replace the entire five-lane driving surface, as well as the truss sections and other parts of the bridge.
An annual inspection of the Blanchette Bridge was expected to end last Thursday but will go on in the westbound lanes of the span.
MoDOT’s construction crews are wrapping up other projects.