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Chronology - Before August 2007

Page history last edited by Steve Escher 15 years, 3 months ago

Before August 2007…


Pre 1964

  • The civil engineering firm of Sverdrup & Parcel designs the original I-35W arch deck truss bridge, known as Bridge 9340, over the Mississippi River. Leif Sverdrup (deceased) founded the firm 1 April 1928. The firm is now part of Jacobs Engineering, Inc.





  • Industrial Construction Company constructs the bridge's steel trusses and deck.



  • The original I-35W Bridge opens for traffic.



  • Structural repairs (drawings) are made to the 35W Bridge.





  • The federal government rates the 35W Bridge as “structurally deficient” and mentions significant corrosion in its bearings.






March 2001

  • University of Minnesota engineers issue a report that rates the 35W Bridge as structurally deficient, but not in need of immediate replacement.


15 June 2006

  • URS, Inc., a San Francisco-based consulting firm, completes the last full inspection of the bridge and recommends reinforcing 52 trusses. 


October 2006

  • Mn/DOT’s Bridge Office requests money from the state, and is funded with $1.5M, for reinforcing the 35W Bridge. 


19 December 2006

  • Mn/DOT is told ultrasonic inspections are an alternative to installing reinforcing plates. URS sends Mn/DOT a draft with three revised options: reinforce 52 beams, inspect the beams with ultrasonic equipment, or a combination of reinforcing 24 beams and inspecting the other 28.


17 January 2007

  • State Bridge Engineer Dan Dorgan and staff opt for inspection only, saying the decision is based on URS assurances that inspectors can detect and isolate cracks before they reach a dangerous length.


18 January 2007

  • Senior Engineer Gary Peterson tells Mn/DOT's Metro Division the plate-installation project will be delayed.


May 2007

  • Inspections of critical beams begin on half of the designated beams. Inspections are halted when the summer repair work begins.


Summer 2007

  • Structural repairs are made on the bridge (drawings). The work includes concrete and joint repair, lighting and guardrail installation and is scheduled to be completed by 30 September 2007.



Continue on to the August 2007 chronology.

Skip to the after August 2007 chronology.

Comments (2)

Sara McDonnell said

at 8:45 am on Apr 20, 2008

In this section, I noticed the verbs alternating between passive and active voice. I would suggest using one or the other throughout. Elements of Style recommends the active voice. I believe the active voice sounds more authoritative.

I also noticed the entries include both complete and "abbreviated" sentences. For example:

"March 2001
University of Minnesota engineers issue a report rating the I-35W Bridge as structurally deficient, but not in need of immediate replacement.
15 June 2006
Completion of bridge’s last full inspection."

I think that consistently identifying the subject could add clarity and strengthen the tone. I would also consider consistency in using articles.

Sara McDonnell said

at 9:35 am on Apr 20, 2008

Do you think it would enhance the reader's experience to link directly to the PDFs documenting the repairs made in 1977 and 1985?

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