Rain-soaked sandstone is unstable. Hiking upcanyon, we found a boulder the size of a Winnebago that had peeled off the mesa and bashed a fifteen-foot-wide swath down the scree slope.

It had taken out the piñones, hit the canyon bottom, run up the opposite side, rolled back down, bounced a couple of times and settled back to dam the creek into a fine little trout pool.

The bashed pine needles were still green, but the pool already had a half dozen six-inch fish in it.

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