The Stone Bridge spans the Conemaugh River in Johnstown, Pennsylvania. The bridge is a seven-arch stone railroad bridge located on the Norfolk Southern Railway mainline, built by the Pennsylvania Railroad in 1887-88. Its upstream face was reinforced with concrete in 1929. This bridge survived the Johnstown Flood of 1889, but the bridge blocked debris, which subsequently caught fire and created an inferno covering 30 acres (120,000 m²).