They had now before them the grandest of all the gorges, though only two hundred feet deep at the beginning; but they had not proceeded far into it before the walls ran rapidly up while the river ran rapidly down.

Numerous falls appeared, one following another in quick succession, necessitating portages and much hard work.
When Powell managed to climb out on the 7th, the walls had grown to twenty-three hundred feet.

They soon increased to about thirty-five hundred feet, often vertical on one or the other side at the water, and even in the upper portions extremely precipitous.

By the 10th they had reached the mouth of the Little Colorado, where White's imagination had pictured the greatest terror of the whole river, and the end of all the dangerous part.

The walls of this tributary are, as is usually the case, the same as those of the main gorge, but the stream itself was small, muddy, and saline.