Mosaic Canyon is what is known as a scour and fill canyon. Every few decades, flash floods fill the canyon with gravel from the surrounding mountains.

When this occurs, the passages cut through the canyon that you see us walking through are buried.

But, as lighter rains slowly rinse the canyon out for the next few decades, the gravel recedes.

In some areas along the cavern walls, we found bent iron rods pounded into the rocks; remnants of railing put in place to aid hikers when the gravel was higher.

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