On the dry rock-strewn benches above the river you can trace the course of the irrigation ditches by the line of cottonwood and willow trees that grow along their course. The trees are the only green thing on the benches with their sparse short grass being their only cover. Below the benches along the river, is a lush green riparian corridor of grass, shrubs and trees and on a hot, dry Montana summer day it's a vibrant, cool oasis in the midst of a seemingly endless treeless plain.