Content 2007 08 09 20070809 Gussetplate 2
Gusset Plate

The Associated Press reports that the NTSB is focusing on several potential causes of the I-35W bridge collapse.

Contributors to the collapse that are under investigation include:

– a rusted gusset plate
– corroded and debris filled roller bearings
– a design issue
– weight on the bridge
– the contribution of the 91ºF heat that day

How long will it take for the NTSB to complete their accident investigation? The article reports that the agency says it could take another 12 to 18 months. Hardly the instant root cause analysis results needed by 24 hour news coverage.

For more info see:

http://minnesota.publicradio.org/display/web/2007/10/23/ntsbtimeline/?rsssource=1