Colo. officials plan to remove boulders above road
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#1 Apr 5, 2011
What is a natural occurance each spring and why Independence Pass is closed until later is the phenomena of frost heave. Far more rocks fall from frost heave than from goat erosion. Tiny amounts of water seeps under the rock. As the water freezes, the ice takes up more space and pushes the rock away from the surface. When the water melts, the rock moves a tiny amount. Eventually the repeated frost heave, day after day, will move the rock to a point that it falls down the hill.
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