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The article presents an update on the investigation into the collapse of the bridge in Minneapolis, Minnesota, on August 1, 2007. It states that engineers probing the disaster are anxious to disclose their findings, but federal officials with the National Transportation Safety Board are just as eager to keep them quiet until the review is complete. Several sources suggest engineers are looking at the stress that seized bearings, construction loads, truss corrosion and hot summer weather placed on gusset plates that were underdesigned from the beginning.

Profiles John A. Clark, mechanical group manager at Bakke Kopp Ballou and McFarlin, Minneapolis. Educational and training background of Clark; Organizational affiliations; Career highlights; His view on what is the most immediate heating, ventilation, air-conditioning (HVAC) concerns.