the report presents a comprehensive treatment of the technical and non-technical issues related to the impacts of in-stream sand and gravel mining upon the stability of river systems in arizona. all major categories are addressed, including such areas as: regulatory practices, structural hazards, economic value, social and environmental factors, statewide classification of streams, review of methodlogies, mitigation measures, engineering parameters, long-term procedures, short-term procedures, river response simulation procedure, case histories, justification for regulation, implementation plan, and recommendation for further monitoring and data collection. the physical processes associated with sand and gravel mining and the impacts of sand and gravel mining on the streams, rivers, and riverine structures are documented. the concepts, theory, and experience of the team have been incorporated in the report in the form of written material and mathematical models. methods have been formulated and presented for evaluating both short-term and long-term response of sand and gravel mining on river behavior, bridges, and associated river control structures