This report provides a detailed overview of the Columbia Southern Irrigation Project, a major water management project in central Oregon. Drawing on extensive research and analysis, author Olaf Laurgaard provides valuable insights into the technical and economic aspects of the project, as well as its broader impact on the region's social and environmental landscape. 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.