From Portland Afoot
A sidewalk built to current standards costs about about $1 million per mile to build, as of 2010, according to Roger Averbeck. In 2009, the Portland Plan process estimated that Portland's 4,804 miles of sidewalks had a replacement value of about $1.6 billion, about $333,000 per mile. That was about 20 percent of the total infrastructural assets of the Portland Bureau of Transportation.
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