Why did the Minneapolis bridge collapse?

And the National Transportation Safety Board determined that it was a design flaw, and not deferred maintenance, neglect, or other problems, that caused the 35W bridge to collapse. Gusset plates that hold the bridge’s huge steel beams together were only half as thick as they should have been.

When did the I 35 bridge collapse in Minnesota?

Aug. 1, 2007
On Aug. 1, 2007, Minnesota suffered a tragedy of historic proportions when the I-35W bridge (bridge 9340) over the Mississippi River in Minneapolis collapsed.

What was the final conclusion of the investigation of the Minneapolis bridge failure?

The NTSB concluded that the root cause of the bridge collapse was a design error that resulted in gusset plates at 4 locations on the bridge being too small to carry the load that was placed on the bridge. This design flaw resulted in a structure that was doomed from day one.

How many people died on the bridge collapse in Minneapolis?

Thirteen people died
Ten years ago today, the unthinkable happened in Minneapolis when an interstate bridge collapsed just at the end of rush hour. Thirteen people died, and many more were injured.

When a bridge falls disaster in Minneapolis?

The I-35W bridge was one of Minnesota’s busiest, carrying 140,000 cars a day over the Mississippi River. It collapsed during rush hour on Aug. 1, 2007. Ten years later, the disaster still looms large.

What type of bridge was the i35?

Truss bridge
Arch bridgeTruss arch bridgeContinuous truss bridgeDeck arch bridge
I-35W Mississippi River bridge/Bridge type

Where was the MN bridge collapse 10 years ago?

Ten years ago, the Interstate 35W bridge over the Mississippi River in downtown Minneapolis collapsed, sending cars, trucks and even a school bus that were crawling over it in bumper-to-bumper rush hour traffic plummeting into the river below and onto the rocky shore. Thirteen people were killed, 145 more were injured, many of them seriously.

Where is the Mississippi River Bridge in Minnesota?

/  44.97889°N 93.24500°W  / 44.97889; -93.24500 The I-35W Mississippi River bridge (officially known as Bridge 9340) was an eight-lane, steel truss arch bridge that carried Interstate 35W across the Saint Anthony Falls of the Mississippi River in Minneapolis, Minnesota, United States.

Why was the 35W bridge in MN structurally deficient?

In the immediate aftermath of the 35W bridge collapse, the Minnesota Department of Transportation came under intense scrutiny. The interstate highway bridge had been classified as structurally deficient, meaning that it was aging and in need of repair. In fact, some repair work was going on when it fell.

When was the Mississippi River Bridge last inspected?

Since 1993, the bridge was inspected annually by MnDOT, although no inspection report was completed in 2007, due to the construction work. In the years prior to the collapse, several reports cited problems with the bridge structure.