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Geological Survey Water Supply Papers This is the highest recorded discharge in the USGS files (excluding the 1891 Chambers Lake dam failure and the May, 1904 flood) for tills gage For comparison, the May 3 I, 1930 storm occurrence was recorded in Water Supply Papers; the flood discharge (estimated) for this event was 10,200 cfs and wiped out the gage_ Two questions arise: did a significant rainfall occur (extreme precipitation), and is the 1901 discharge accurate (suspect) as it exceeds the 1930 event. c) Identification of areas in Colorado where little to no extreme precipitation data exist and very few instances of flooding have been noted_ One area targeted by the Colorado Climate Center for investigation is Region 6, the Northern Rocky Mountain interior valleys and plateaus, which includes Craig, Meeker, Rifle, and vicinity An examination of the extreme streamflows may identify snowmelt as the primary (if not only) mechanism for flood discharge_ The results from this investigation may have significant ramifications on the future development of Probable Maximum Precipitation estimates for this region. Indirect File Documentation The Indirect File list is a modified version of the US Geological Survey Indirect Discharge Measurement file. The file has been slightly altered to Microsoft Excel spreadsheet format; the original data has not been altered except for presentation in a column format. The list includes all known indirect discharge measurements made by the US Geological Survey Colorado District, thus it is not inclusive to extreme events (for example, greater than a 100-year event). Due to the dangers and destructive nature of floods, accurate measurements at the time of the peak discharge are very difficult and seldom attempted Indirect measurements are made at a location after the flood has passed. Typical site selection is: a gaging station destroyed by a flood; a flood discharge which is much higher than the existing rating curve (stage-discharge relation); or where loss of life, significant property damage, or roadlbridge damage has occurred. The file is the primary source for flood discharge measurements for Colorado, and encompasses the major drainage basins and counties in Colorado. The list contains locations, dates, discharge estimates, type of measurement, and brief quality descriptor. Location- Gage locations are noted by Colorado County, USGS Gaging Station number, Iatitude/Iongitude, and brief description/location. Type of Measurement: the indirect measurmnent method used is indicated by the following measurement type codes: I - Slope area; 2 - weir; 3 - culvert; 4 .- contracted opening; 5 - float; 6 - critical depth. c -2