Span's Anti-Ice Chemical May Have Speeded Corrosion
Although the probe of the I-35W bridge disaster in Minneapolis remains in an early stage, the National Transportation Safety Board is widening its investigation to retrofits made to the 40-year-old bridge before it collapsed on Aug. 1, killing 13.
Forensic engineers are reviewing design records and "have begun developing a list of the various construction projects and modifications that were performed to the bridge after the original construction," says NTSB in an Aug. 22 bulletin.