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 National Transportation Safety Board’s NTSB on-going investigation uncovers an error in the original 93340 process that resulted in undersized gusset plates on some of Bridge ‘s main trusses. Add Specific Training on Gusset Plate Inspections The process of designing, building and inspecting the bridge had plenty of assumptions. The bridge also had poor past assessments from US regulatory agencies, raising questions surrounding state upkeep and maintenance procedures. Humphrey Metrodomeand the north abutment was northwest of the University of Minnesota East Bank campus.

The FHWA advised states to inspect bridges of similar structure after its investigation. The link includes the day extension of the executive order by the Executive Council of the State of Minnesota.

M6 I Fortunately, security cameras and traffic monitoring allow us to pinpoint ckllapse exact time when the bridge began to fall: Local businesses donated wireless Internet, ice, drinks and meals for first responders.

The New York Times. But it does show that when you are building a Cause Map to perform extensive Root Cause Analysis of an incident, you may see a cause in multiple places. But we didn’t have one problem with any of these issues, because we knew who was in charge of the assets,” said Rocco Forte, city Emergency Preparedness Birdge.


On January 15,the board issues Safety Recommendation Hdealing with load capacity calculations for non-load-path-redundant steel truss bridges in the United States.

10 Years After Bridge Collapse, America Is Still Crumbling

Listing them separately would lead brixge an individual, discriminating look at this brirge part. The full Cause Map based on the information found in the NTSB report has more than 50 causes, but even more detail can be added for clarification or if additional information arises as part of the investigation.

The investigation revealed that photos from a June inspection of the bridge showed gusset-plate bowing. Much of the bridge debris was temporarily stored at the nearby Bohemian Flats as part of the ongoing investigation of the collapse; it was removed to a storage facility in Afton, Minnesotain the fall of The Infamous Gusset Plates. By JanuaryMinnesota DOT began testing magnesium chloride solutions and a mixture of magnesium chloride and a corn-processing byproduct to see whether either would reduce the black ice that appeared on the bridge during the collapsee months.

The first is that the bowing displacement of the gusset plates went unmentioned.

I Bridge Collapse | ThinkReliability, Case Studies

The primary cause of the collapse was the undersized gusset plates, at 0. Vehicles coming across the bridge experienced black ice and there was a major pile-up on the bridge on the northbound side. About 35 of them were determined to need only routine, preventative maintenance.

This includes focusing on the specific time, date, and location of the incident. On March 17,a NTSB update states that excess construction weight was placed above the earlier-reported too-thin gusset plates. University of Minnesota Press, H37 Highway Spending: Archived from the original on September 7, Archived from the brodge on August bbridge, Limit Weight Concentration of Construction Materials The concentration of weight over the gusset plate caused strain and contributed to the collapse of the bridge.


The design firm review process was not followed because there was no procedure for ensuring all calculations had been performed.

The NTSB also found that nearly tons of construction equipment and materials stockpiled on the bridge deck for the ongoing repair work contributed to the collapse by further stressing the crucial gusset plate that failed.

The Committee was charged with conducting a comprehensive review of decisions made by MnDOT pertinent to the collapse. Let’s Hope the Lessons Are Remembered”. Their efforts were hampered by debris and challenging currents.

Retrieved from ” https: The NTSB determined that corrosion was not a significant contributor, but that inspectors did not routinely check that safety features were functional. CT, when a colleague called with the horrifying and heartbreaking news.

M6 S73 State Highways and Bridges. Bush on August 6, The National Transportation Safety Board immediately began a comprehensive investigation that was expected to take up to eighteen months. The incident took place while at Bridge in Minneapolis, Minnesota, which crossed the Mississippi River.

Why were the lanes closed? It was the most expensive of the three collapses.