This photo taken Wednesday, Sept. 2, 2015, and provided by Frank Talbott shows workers stabilizing a sandstone wall along the Glen Canyon dam near Page, Ariz. The massive slab of rock is threatening to come crashing down at the base of the Arizona dam. The three-person crew has been working to stabilize the sandstone that forms the walls surrounding the Glen Canyon dam near the Arizona-Utah border.  The slab weighs 500,000 pounds and recently began to crack due to erosion. The area below the slab includes a boat ramp, and water and power facilities for the dam. (Frank Talbott via AP)

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