Civil engineers working on a bridge project in Armstrong County used more than 750,000 scrap tires to fill the embankments supporting the approaches to the bridge, according to the Pennsylvania Department of Transportation.
PennDOT worked with the Pennsylvania Department of Environmental Protection, several private contractors and University of Maine engineering professor Dana Humphrey on the $3.7 million Tarrtown Road Bridge replacement project.
The bridge work was officially completed Oct. 21.
Scrap tires were the natural fill for the embankments because the soil in Armstrong County won't support heavier fill, a PennDOT spokesman said. A department news release touted the project as improving the quality of life in Armstrong County in two ways: replacing an important bridge, and ridding the county of scrap tire piles.
PennDOT is uncertain whether it will use scrap tires in future projects, the spokesman added.