The goal of the project is to establish criteria which can be used to identify and estimate economic, aesthetic, social, and other values associated with rivers. The report examines the role of water quality in the selection and management of a system river. It presents a brief review of significant water quality parameters and their importance to a system river and suggests water quality criteria suitable for a system river. The factors which control the quality of water in a system river and the constraints necessary to maintain water quality are discussed. Next the report analyzes the Salmon River in Idaho. A general appraisal of existing quality of water based on available data is presented. A method for simulating the temperature regime of a river was developed. Ramifications of utilizing Salmon River water for temperature control in the Snake River are examined. (Author)