Monday, 13 April 2015

National Bridge Inventory

Pittsburgh is sometimes called the City of Bridges, so you might think that bridges are a topic of interest here. Unfortunately, the Federal Highway Administrations webpages about bridges are eye-glazingly boring - though with some effort you can find an excel spreadsheet that tells you that Allegheny County has 1,267 bridges, which is way more than any other county in PA.
However, Congressional Quarterly has kindly provided an interactive map called "National Bridge Inventory - Deficient Bridges"  that takes the data and makes it interesting and easy to see where the worst bridges are located, state-wise. The good news is that Massachusetts and Rhode Island have more deficient bridges than PA (the annual National Bridge Inventory identifies deficient bridges across the nation. According to the FHWA, structurally deficient bridges, though not inherently unsafe, have been identified through inspection and rated to be in poor condition. Functionally obsolete bridges are those that do not conform to updated design standards.) The bad news is that PA is in the second-to-worst of 5 categories.  

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