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<br />0028~2 <br /> <br />Precipitation at 13 Index Stations <br /> <br />The print, "Accumulated Monthly Precipitation, Upper Colorado River <br />Basin," show a comparison of the accUDnllated precipitation from <br />October 1, 1971, at 13 index stations used in preparing the forecast, <br />With similar data for other selected years of record, During the <br />October 1971 through February 1972 period, the precipitation above <br />Lees Ferry was about 90 percent of average, <br /> <br />Snow Data Analysis <br /> <br />The March 1, 1972, snow surveys for 50 courses reveal that the water <br />equivalent of accumu1ated snow cover in the Colorado River watershed <br />above Lees Ferry is above average, The folloWing tabulation lists <br />comparative results for the watersheds of the three main tributaries <br />for February 1. <br /> <br />Averaae Water Equivalent of Snow on March 1 <br /> <br />Drainage Basin <br /> <br />l.Llcl:les J.L Wa.ter <br />1972 1971 1970 1969 <br /> <br />Percent or Avarae;e <br />1972 1971 1970 1969 <br /> <br />Colorado River above <br />Cisco, Utah 11,9 12.9 1j,b 14,6 <br /> <br />91 <br /> <br />99 liO ll9 <br /> <br />Green River ahove <br />Green River, Utah <br /> <br />10,2 19,4 14,7 19.3 <br /> <br />125 <br /> <br />134 102 133 <br /> <br />San Juan River above <br />Bluff , Utah <br /> <br />U,3 9,4 <br /> <br />8,3 18,8 <br /> <br />&l <br /> <br />88 <br /> <br />. 68 155 <br /> <br />Approximately 97 percent of the water passing Lees Ferry originates <br />above these three locations, <br /> <br />Aprll..July runoff in <br />millions acre-feet <br /> <br />8,4 <br /> <br />8.2 8,2 <br /> <br />Attacllment <br />(DraWing) <br />