A 500,000-pound rock threatens to collapse on dam near Flagstaff, Arizona

Is this massive 500,000-pound rock going to collapse on a dam near Flagstaff, Arizona?

Well, the government sent rappelers to keep the slab in place… So it must be quite a threat.

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Workers stabilize the 500,000-pound giant chunk of sandstone along the Glen Canyon dam near Page, Arizona. Photo: Frank Talbott via AP

The 500,000-pound slab began to break away from the canyon wall last week due to erosion. The slab measures 30 feet at its widest point and is 50 feet tall. Its thickness ranges from six inches to 4 feet.

This crack in the canyon wall is the largest one in years, and workers at the dam have been watching it closely

If it was to crash down, it would most probably destroy a passageway to a boat ramp, a machine shop and water and power facilities for the Glen Canyon Dam.

The sandstone canyon wall hase been reinforced with bolts that range from 6 feet to 8 feet. A week ago, a small chunk broke loose and crashed to the ground, hitting a building and leaving a pile of rubble.

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