The attention devoted to reaching a critical balance of water supply reliabil¬ity and ecosystem health has involved a small army of scientific, legal and policy experts – all intently focused on a river system that is caught in a set of ongoing environmental issues as well as predicted changes in precipitation that look to disrupt the fundamental assumptions of how much water will flow in the next 100 years. This issue of River Report, “Balancing the Colorado River’s Ecosystem and Water Delivery Capability,” looks at some of the issues associated with balanc¬ing the Colorado River’s ecosystem and its water delivery system. Much of the content is based on the comments of a panel assembled at the Foundation’s invitation-only 2009 Colorado River Symposium.