215 feet high, 40 feet thick, 100 feet wide with a 90 foot span between the walls. The arch contains 450,000 cubic feet of rock weighing 72,000,000 pounds or 36,000 tons and is estimated to be at least 500 million years old. At it’s peak, the bridge is 1,160 fee above sea level. The Lee Highway, U.S. Route 11, passes directly over head.