Notes
- a. ^ The National Highway Administration established the sufficiency rating, which can vary from a low of 0 to a high of 100, as a way to prioritize federal funding for bridges. The rating is calculated based on "structural adequacy, whether the bridge is functionally obsolete, and level of service provided to the public". Federal funds are available for replacement of bridges with a rating of 50 or below, while those with a rating of 80 or below qualify for rehabilitation. In 2007, Pennsylvania had 22,291 bridges over 20 feet (6.1 m) long, of which 42.9 percent were either structurally deficient or functionally obsolete.
Read more about this topic: Waterford Covered Bridge
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