Biological crust is a community of organisms that weaves through the soil and holds it together. This bumpy surface layer is a nursery for seedlings, adds nutrients to the soil, captures rainwater and reduces erosion. Help us protect soil crusts: please walk on trails, on rock or in sandy washes (where water flows when it rains), and keep all vehicles and bikes on designated roads.
During the summer of 2002, flows on the Colorado and Green Rivers dropped to record lows. These photos were taken in Cataract Canyon during the week of July 1, 2002 when the flow was estimated to be 2,700 cfs (cubic feet per second).