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- Canyon Creek gage near Dolores has an additional 20 years of data. Table 15 lists the gaging stations used in this study for the flow frequency analysis. Table 15 Streamflow Gaging Stations (See .Plate 2 for locations and Table 4 for additional information) Station ID Name Drainage Period of Comments Area (mi2) Record USGS 09165000 Dolores River below Rico 105 1952-1996 1999-2003 . 1896-1903 USGS 09166500 Dolores River at Dolores 504 1911-1912 Gage location change 1922 1922-Present USGS 09166950 Lost Canyon Creek near Dolores 71.3 1984-Present 1984 not complete water year USGS 09167000 Lost Canyon Creek at Dolores 73.5 1941-1948 1941 not complete water year Peak flow records 1922-1927 Prior to 1922 the Dolores River at Dolores gage was located downstream of the It confluence of the Dolores River and Lost Canyon Creek; only records from 1922 forward were used to develop flow frequency curves at the current Dolores gage location. The Dolores River at the below Rico gage has daily streamflow records for water years 1952-1996, and 1999 to 2003. The Lost Canyon Creek gage has annual peak flow records for 1921-1927, and daily records for water years 1941-1948 at a location just upstream from the confluence ofthe Dolores River. A gage 3 miles upstream from the confluence was established in 1984, when McPhee Reservoir began storing water. For the present study, the records at the two Lost Canyon Creek gages were considered equivalent. In general, high flows on Lost Creek for rain and snowmelt events are not coincident with the peak flows at the Dolores gage. 8.2 Rainflood and Snowmelt Records. Peak flows on the Upper Dolores River can be caused by a general rainstorm, snowmelt, or a combination of rain on the melting snowpack. The e mixed population complicates flow frequency analysis. The runoff records for the three gages - 29