Conflicts over water are not new. Such conflict has existed for as long as land has been settled and developed. Today, an increased rate of growth in many areas of the United States is placing additional stress on natural resources and existing water projects to both meet drinking water needs and to do so with minimal effect on the environment. The challenge will be to address future demand and manage instream needs such as protection of fish. To meet this challenge without conflict, cooperation and collaboration among private sector, local, state, and tibal government leaders and water managers must occur. This case study conducted in the Walla Walla watershed in Oregon and Washington demonstrates that such cooperation can be successful. Through true collaboration, a plan was created that reflects sound science and good public policy and that gives the community a personal stake in ensuring the plan's efficacy. Includes figure.