About 75 seismic sensors will measure forces imparted on the span.
Factors could include wear from weather, more traffic than the bridge was originally built to sustain.
Canadian-financed span over the Detroit River to provide direct connections to existing highway networks in Windsor and Detroit.
Federal spending projections account for some $4.8 billion in costs.
Defects include porous steel plates; incomplete or non-existent soldering; defective bolts.
Contract worth $225 million the largest in the Quebec company’s history.
US Coast Guard permit ends phase 1; next step is funding a US Customs facility.
$1-billion international bridge project still needs exemption from Buy America policy.
Components will be fabricated at Structal-Bridges plant in Quebec City.