The epic story of the fastest boat ride in history, on a hand-built dory named the "Emerald Mile," through the heart of the Grand Canyon on the Colorado river.

This is the guidebook to the Colorado River used by the characters in Will Hobbs's book "Downriver".

Kim Crumbo, a river ranger at Grand Canyon National Park, has written a guide to the rich human history of the river and its canyon. Every rapid and other point