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RE: Bridge/building

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 " Any "gut feel" superstructure costs for the main span of 500' x 100' wide x 50' high? "
 Am I reading this right???  Your bridge has a 500'-0" span length???  It has to be 100'-0" wide???  And it has to be 50'-0" high (or is this the vertical dimension from off the ground)???  Please clarify.
Dave Maynard, PE
Gillette, Wyoming