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.
Portland is estimated to have around 170 miles of streets with no sidewalks (that is not counting those street segments with sidewalks on one but not both sides).
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