1. By Kelly Warden December 2013 1

2.  Opened in 1967 along I-35 W  Bridge goes over the Mississippi River in Minneapolis, Minnesota  Minnesota’s 5 th busiest bridge crossing with over 140,000 vehicles daily  Eight lane bridge stretching 1,907 ft. December 2013 2

3.  The bridge collapsed on August 1, 2007 at 6:05 pm  Central span of the bridge collapsed, then the adjoining  13 deaths, about 100 injured December 2013 3

4.  1990 - The I- 35W bridge rated “structurally deficient” due to corrosion in the bearings  1993 - By law, bridges need to be inspected every 2 years, however, annual inspections were deemed necessary  2001- Study by UoM found signs of cracking and fatigue  2005 - Bridge sufficiency rating = 50%  January 2007 - Internal department of transportation documents discussed the bridge collapsing or being condemned December 2013 4

5.  Sverdrup & Parcel  Hurcon Inc. and Industrial Construction Company  Minnesota Department of Transportation  National Transportation Safety Board  University of Minnesota  US Dept. of Transportation’s National Bridge Inventory  Wiss, Janney, Elstner Associates, Inc. December 2013 5

6. National Society of Professional Engineers (NSPE) 1. Hold paramount the safety, health, and welfare of the public. 2. Perform services only in areas of their competence. 3. Issue public statements only in an objective and truthful manner. 4. Act for each employer or client as faithful agents or trustees. 5. Avoid deceptive acts. 6. Conduct themselves honorably, responsibly, ethically, and lawfully so as to enhance the honor, reputation, and usefulness of the profession. December 2013 6

7. 1. Hold paramount the safety, health, and welfare of the public. Positive EthicsOpportunity for Improvement Following the poor inspection ratings, a firm was hired to analyze the bridge. Original design was flawed and someone most likely knew about it. After the collapse, bridge inspections were mandated. No timely repairs made. Bridge was overloaded and never advised the public. December 2013 7

8. 3. Issue public statements only in an objective and truthful manner. Positive EthicsOpportunity for Improvement Objective and truthful information released describing what went wrong in the bridge collapse. Limited public from viewing collapse. Denied people public information December 2013 8

9.  The issue has in general made the nation more aware of the poor state of US bridges  25% of bridges are now deficient, down from 29% in 1998.  It will take 50 years to bring all bridges up to safety standards.  Replacement bridge built for $234M.  The I-35W Saint Anthony Falls Bridge was opened to the public on September 18, 2008. December 2013 9

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