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Balanced Rock in Arches stands about 128 feet (39 m) high, with the balancing rock rising 55 feet (16.75 m) above the base. The big rock on top is the size of three school buses. According to the guidebook, it weighs as much as 1,600 full size cars! Estimated at 3,577 tons! .. that's over 7,000,000 (that's seven million, folks) US pounds! Or for everyone else in the world, over three million kilograms. Either way you look at it, that's a lot of rock being balanced.