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COLLECTION OF WATER-RESOURCES DATA 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, ground-water levels, well and spring discharge, and the quality of surface and ground water (table 1). Every year some new stations are added and other stations are ter- minated; thus, the U.S. Geological Survey has both a current and a historical file of hydrologic data. Most water-resources data are stored in the U.S. Geological Survey's WATSTORE (National Water Data Storage and Retrieval System) data base 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 computer-printed tables, statistical summaries, and digital plots. Local assistance in the acquisition of services or products from WATSTORE can be obtained by contact- ing the District Chief, Lakewood, Colorado. Table 1.--Water-resources data-collection stations in operation during fiscal year 1987, by station classification [The number and type of stations located in each county are shown on plate I (in pocket)] STATION CLASSIFICATION NUMBER OF STATIONS Streamflow: Continuous (daily) record Seasonal (daily) record Peakflow, crest-stage record Real-time stage and discharge 287 36 46 82 Lakes and reservoirs: Stage and content Real-time stage and content 19 5 Water quality: Periodic chemical quality Daily quality monitoring 99 41 Ground water: Periodic water levels Daily water levels Chemical quality 75 66 14 Meteorological: Daily precipitation and(or) air temperature Periodic precipitation quality Real-time precipitation and(or) air temperature 24 1 33 6