Download or read book Collapse of I-35W Highway Bridge, Minneapolis, Minnesota, August 1, 2007 written by United States. National Transportation Safety Board and published by Createspace Independent Publishing Platform. This book was released on 2008 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the early afternoon, construction equipment and construction aggregates (sand and gravel for making concrete) were delivered and positioned in the two closed inside southbound lanes. The equipment and aggregates, which were being staged for a concrete pour of the southbound lanes that was to begin about 7:00 p.m., were positioned toward the south end of the center section of the deck truss portion of the bridge and were in place by about 2:30 p.m. About 6:05 p.m., a motion-activated surveillance video camera at the Lower St. Anthony Falls Lock and Dam, just west of the I-35W bridge, recorded a portion of the collapse sequence. The video showed the bridge center span separating from the rest of the bridge and falling into the river.