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Arch Bridge 
Arch bridges typically span distances between 200 and 800 feet. You might be
able to engineer one that spans 1,000 feet, but what about the abutments that
bear the load? Muddy river banks may not make very good supports. Try again.Photo: Portland Cement Association Build A Bridge | Resources | Guide | Transcript | Bridge Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated October 2000 |