Structurally Deficient Bridges

Much is being made of the fact that the bridge that collapsed in Minneapolis was rated as “Structurally Deficient” in the U.S. Department of Transportation’s National Bridge Inventory database. As an FYI, 2,447 of Illinois’ 25,943 bridges carry the same rating as of 2006. Not to make you feel nervous or anything.

You can check on individual bridges from the NBI using the search function at NationalBridges, but that site seems to be rather overloaded at the moment.

(via Slacktivist)

2 Comments so far

  1. anonymous (unregistered) on August 2nd, 2007 @ 12:21 pm

    Where did you get your information from? Do you have a link to these bridges?

  2. Fuzzy (unregistered) on August 2nd, 2007 @ 12:35 pm

    Sorry, that’s what I get for posting right when I’m all lunchhungry. I’ve added the link above to the database. In the first table, the “count” column is the number of bridges in the state and the “SD” column is “Structurally Deficient”. “FO” is “functionally obsolete”.

    “A structurally deficient bridge is closed or restricted to light vehicles because of its deteriorated structural components. While not necessarily unsafe, these bridges must have limits for speed and weight. A functionally obsolete bridge has older design features and, while it is not unsafe for all vehicles, it cannot safely accommodate current traffic volumes, and vehicle sizes and weights.”
    — from

    I’ve also added a link to the searchable version of the NBI above.

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