This report provides a detailed account of the Tumalo irrigation project, which was initiated in the early 20th century to provide water to the arid regions of central Oregon. The report details the planning, design, and construction of the project, as well as the environmental and social impact of the irrigation on the local community. It is an important resource for scholars studying the history of irrigation and water management in the American West. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.