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The streamflow data available for Oregon are evaluated and guidelines for planning future programs are provided. Basic steps in the evaluation procedure are (1) definition of the long-term goals of the streamflow-data program in quantitative form, (2) examination and analysis of all available data to determine which goals have been achieved, and. (3) consideration of alternative programs and techniques to meet remaining objectives. It was found that only a few of the goals could be met by generalization of the data now available for gaged basins. Therefore, recommendations are made to improve the generalization methods, and deficiencies in the present network are pointed out. Based on the needs described in this study, a streamflow-data program is proposed for the future.

Hydrologic-data stations are maintained at selected locations throughout Colorado and constitute a water-resources-data network for obtaining records on stream discharge and stage, reservoir and lake storage, groundwater levels, well and spring discharge, and the quality of surface and ground water. Every year some stations are added and others are terminated; thus, the U.S. Geological Survey has both a current and a historical file of hydrologic data. Most waterresources data are stored in the U.S. Geological Survey's WATST0RE (National Water Data Storage and Retrieval System) and are available on request to water planners and others involved in making decisions affecting Colorado's water resources. These data can be retrieved in machine-readable form or in the form of computerprinted tables, statistical analyses, and digital plots. Local assistance in the acquisition of services or products from WATST0RE can be obtained by contacting the District Chief, Lakewood, Colo. Surf ace-Water Data Surface-water discharge (streamflow), stage (water level), and water-quality data are collected for general hydrologic purposes, such as assessment of water resources, areal analysis, determination of long-term trends, research and special studies, or for management and operational purposes. Discharge and stage data currently are being obtained at the number of stations given below. Station Classification Number of stations Stream stations 393 Continuous record 357 Partial record 36 Lake and reservoir stations 27

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