Wallenda's walk over Niagara Falls by the numbers

Associated Press Published: June 15, 2012
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NIAGARA FALLS, N.Y. (AP) — Some facts and figures about daredevil Nik Wallenda's Friday night wire-walk over Niagara Falls:

Length of wire: 1,800 feet

Weight: 7 tons

Diameter: 2 inches

Material: Steel

How it's installed: Helicopter flew lighter tension wire across Niagara Gorge. That acts as guide for cable to be pulled by machines across the gorge.

How it's secured: Bolts are sunk deep into bedrock, several hundred yards back from each shore.

Estimated time for walk: 30-40 minutes

Wallenda footwear: Elkskin-soled shoes custom-made by his mother.

Balance pole: 30 feet long; 40 pounds

Estimated attendance: 125,000 in Canada; 4,000 on U.S. side

Direction: From the United States to Canada

Weather forecast for Friday night: Temperatures in the low 60s with winds out of the east at 10 mph or less

Height of Horseshoe Falls (where Wallenda will cross): 170 feet

Height of cable above brink: 20 feet

Volume of water: 600,000 gallons per second.