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Only data from peaks that occurred during periods of natural flow are presented. No data are included for peaks affected by regulation, diversions, ice jams, or structural failures (see the section on Station Selection). Gage-heIght charts of very poor quality, mechanical failures of the recording equipment, human error, and the loss of records make the identification of runoff peaks impossible in some instances; as a result, there are some years for which no differentiated peaks are published. For example, in the section, Differentiated Peak-Fiow Data, there are no listed snowmelt-runoff peaks for Tarrya11 Creek near Lake George for the years 1926, 1939, 1950, 1951, and 1953. Data On rainfall-runoff peaks or snowmelt-runoff peaks are unavailable for some years for Cherry Creek, Fountain Creek, the St. Charles River, and the Purgatoire River. No peak flows attributable to rainfall or snowmelt could be identified during periods of low precipitation or when seepage into the channel or flow attenuation obscured runoff peaks in lower reaches where these stations are located. Other Available Information Additional records and data not published in this report are available from Federal and State governmental offices. Rating tables, mean daily flow values, baseflow discharges preceding differentiated rainfall-runoff peaks, and some differentiated flow data for overlapping rainfall-runoff and snowmelt-runoff peaks are available from the U.S. Geological Survey, Water Resources Division. Gage- height charts from streamflow-gaging stations operated by the U.S. Geological Sur- vey are filed in the Federal Archives and Records Center, Denver Federal Center, La kewood , Colo. Microfilm of streamflow charts from State-operated streamflow- gaging stations is available from the Colorado Department of Natural Resources, Division of Water Resources, Office of the State Engineer. DATA FORMAT Streamflow-Gaging Station Descriptions Each streamflow-gaging station has been assigned an eight-digit identifica- tion number by the U.S. Geological Survey. The first two digits identify the major river basin; for example, "06" (Part 6) includes the Platte River basin, "07" (Part 7) includes the Arkansas River basin, and "09" (Part 9) includes the Colorado River basin. Assignment of station identification number is described in detail in the annual Water Data for Colorado reports published by the U.S. Geolog- ical Survey (1971-79). Also included in the station description are: Gage location, drainage area above the gage site, gage datum, and historic peak data from sources other than continuous stage recorders. Occasionally, gages have been relocated, necessitat- ing revision of gage location, drainage area, and datum. In all cases, the most current station description is published. Additional pertinent information is pre- sented under the "Remarks" subheading. 14