NTSB bridge investigation documents

In its investigation of the 35W bridge collapse, the National Transportation Safety Board prepared over 100 documents. You can find a complete list of the documents on the NTSB Web site.

Key Documents

NTSB interviews with MnDOT's bridge inspectors

Interviews with two members of Sverdrup & Parcell, original 35W bridge design firm

Photograph of construction materials on the 35W bridge

Statement of Progressive Contractors Inc., the company doing deck work on the bridge at the time of the collapse

MnDOT's Dan Dorgan responds to PCI's statement to NTSB

Wiss, Janney, Elster Associates report on the bridge collapse prepared for MNDot, Nov 2008

GIF animation files indicating how stress hit the under-sized gusset:

• Graphic animation 1

• Graphic animation 2