Agate Bridge
The Agate Bridge is a petrified log beneath which rains and floods washed out the sand over a very long period of time to create a gully beneath it.
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The present support structure beneath the "bridge" was build in 1917 to replace masonary pillars that had been built in 1911 to prevent the bridge from collapsing.
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This National Park Service photo shows the Agate Bridge supported by the original masonary pillars.
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Today the Park Service would not have built a support beneath the log, but let nature have its way, even if it fell.
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