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110. 111" 37f)~"''' -... - '"'... -.. '"' _.. "" -..... _.... _...._ 1 <:' 01 <:: >1 LU, Z' 1 . 1 . , I , , I , Figure 1. The Colorado River in Grand Canyon, Arizona. runners who had experienced the unregulated river. In so doing, we realized the discussions would bear greater fruit if they were held in the course of a Grand Canyon trip. The Old Timer's Trip, from September 8-20, 1994, was designed to gain new insights into Grand Canyon history and environmental change along the Colorado River. We sought to record the direct observations of the participants in pre-dam river trips and to incorporate their journals and photographs in our research. We attempted to test our ideas about the magnitude of change with the people who experienced the changes as they occurred. Our intent here is to relate the changes observed by the Old Timers, combined with other anecdotal information in diaries and other written accounts, and to briefly discuss any independent verification of changes and their importance to scientific knowledge about Grand Canyon. UTAH .. N A 20 miles PURPOSE AND SCOPE The purpose of this report is to provide anecdotal information on histlical changes in the Colorado River corridor throu h Grand Canyon. This information was obt ined from interviews with people who experienced th Colorado River before the constructidn of Glen Canyon Dam, diaries and other accounts of historical Colorado River expeditions, and scientific observations and data collected before the advent of environmental studies below Glen Canyon Dam. We interpret this anecdotal information and discuss its value in the management of the Colorado River in Grand Canyon. ~ Units and Nomenclature We use English units to describe distances along the Colorado River in Grand Canyon (designated as Lee's Ferry to the Grand Wash Cliffs, miles 0-278; see 2 OBSERVATIONS OF ENVIRONMENTAL CHANGE IN GRAND CANYON