The center span measures 32 feet and the two side spans are each 29.5 feet long.

But the approaches and side spans of some of them might be, he said, and only a bridge-by-bridge analysis would tell.

Marlow, meanwhile, is nervously sweeping his telescope along the side span of the jungle.

Work on the approaches and side span of the northern side of the bridge were completed in 1988.

Explosives were used to drop the south side span into the Allegheny River at 18:42 on September 29, 1970.

Building of the bridge itself began in March 1958 and the side spans were completed by November 1959.

The centre span is approximately 90m, and each of the side spans are approximately 45m.

The bridge is about 730 yards long, with the two great main spans each of 455 feet and numerous side spans.

Support towers were added under the side spans and trolley lines were converted to roadways.

Length of each side span: 700 feet (213 m)