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August 1, Shortly after 6 pm, the IW Bridge collapses with motor that resulted in undersized gusset plates on some of Bridge ‘s main trusses. tural members could result in the collapse of the whole bridge. In the Bridge , IW Over Mississippi River, Fatigue Evaluation and. After the bridge’s collapse, the subsequent investigation that was conducted by the National . (IW over the Mississippi River).

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The reason gusset plates are not considered important to the load rating is that there is a general assumption that gusset plates the key joints on the bridge are stronger than the parts they connect. Archived from the original on November 8, National Transportation Safety Board NTSB officials asked demolition crews to use extreme care in removing the bridge remnants to preserve as much of the bridge materials as possible for later analysis.

IW Mississippi River bridge – Wikipedia

Immediately upstream is the lock and dam at Saint Anthony Fallswhere Minneapolis began. Views Read Edit View history. Congressional Research Service, Archived from the original on July 3, Archived from the original on January 17, Why was there insufficient load capacity?

Department of Transportation’s National Bridge Inventory database. Three of these causes have their own immediate causes we can also draw out on the Cause Map.


I-35W St. Anthony Falls Bridge

Retrieved September 29, The aftermath investigation has taught construction crews several prevention strategies, avoiding future damage that might occur as fallout from such a collapse. The bridge was located in Minneapolis, Minnesota’s largest city and connected the neighborhoods of Downtown East and Marcy-Holmes.

Minneapolis Police Captain Mike Martin stated that, “The public safety divers are trained up to a level where they can kind of pick the low-hanging fruit. Retrieved May 12, Minneapolis and Hennepin County received mutual aid from neighboring cities and counties throughout the metropolitan area.

Because of the concentrated weight over the gusset plate and increased load on the bridge.

Root Cause Analysis of the I-35 Bridge Collapse

M6 S73 State Highways and Bridges. If an error goes unnoticed for 40 years, it would seem there are some basic checks that could be put in place to resolve the issue.

Thirty-five people lost their jobs when Aggregate Industries of LeicestershireUK, a company that delivered construction materials by barge, cut production in the area.

Why did the main span of the bridge collapse?

Joint Departments, Offices, and Commissions. Without warning, the bridge collapsed, taking with it vehicles. Archived from the original on October 9, Minneapolis Star TribuneAugust 3, So we add a question mark to that part of the description at the top of our Cause Map.


A hindsight view of the collapse offers new knowledge of how we should maintain bridges.

I Bridge Collapse | ThinkReliability, Case Studies

The increased weight on the bridge was a result of an increased dead load on the bridge and the high volume of traffic on the bridge. Schedule a workshop at your location to train your team on how to lead, facilitate, and participate in a root cause analysis investigation.

Retrieved August 7, More importantly, it was the only one of the bdidge that was fatal. Require Written Permission for Staging Materials on Bridges There is no policy requiring permission to stage materials on the bridge. Stanek stated, “We are treating this as a crime scene at this point. Because there were construction equipment and materials on the bridge, concentrated over the gusset plate.

From here, diving deeper into these causes and building out a more detailed Cause Map will give us a better handle on the issue of weight on the bridge vs.