This environmental impact statement describes the potential beneficial and adverse impacts of the proposed continued development of the Columbia Basin Project. Two alternatives for continued development have been analyzed and are discussed in this document: (1) complete the Columbia Basin Project as originally envisioned, by providing irrigation service to an additional 538,600 acres; and (2) expand the Columbia Basin Project on a more limited scale by providing irrigation service to approximately 87,000 acres along the east bank of the East Low Canal. A No Action alternative has also been included as part of this environmental analysis.