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<br />UPPER COLORADO RIVER BASIN <br />as of May 1, 2001 <br /> <br />Mountain Snowpack' (inches) <br /> <br />Precipitation' (% of average) <br /> <br />I---*-current -A--AVera~ <br />,___Ma)(.imum -+-Minimum I <br /> <br />I_Monthly GYear-to-datej <br /> <br />25 <br /> <br /> <br />160- <br /> <br />140- <br /> <br /> <br />o <br /> <br /> 20 <br /> " <br />.!: '" <br />oS l! 100 <br />c 15 " <br />CIl > <br />iii < <br />.~ - 60 <br /> 0 <br />::l ... <br />&:/' C <br />W " <br />~ 10 u <br />~ <br />CIl CIl <br />- <br />~ ll.. <br /> <br /> <br />5 <br /> <br /> <br />Oct Nov Dec Jan Feb Mar Apr May <br /> <br />o <br /> <br />Jan Feb Mar Apr May Jun <br /> <br />*Based on selected stations <br /> <br />Two large storms during mid-April provided additional snow accumulation to the Colorado <br />Basin. But despite the storms, warm temperatures during the month have caused the spring melt <br />to get well under way, and measured snowpack amounts have decreased significantly since last <br />month dropping the overall percent of average from 86% last month, to only 79% on May I. <br />There is 4% less snow than last year at this time. Measurements range from only 61 % of average <br />in the Muddy Creek Watershed, to 100% of average in the Williams Fork Watershed. <br />Precipitation in the higher elevations of the basin was 103% of average during April, and the <br />water year total has been boosted to 86% of average on May I, which is only 93% of the <br />precipitation last year on the same date. The combined storage from 8 major reservoirs in the <br />basin is about 10% above average on May I, but this is only 80% of the storage amount last year <br />at this time. Most of the streamflow forecasts for the upcoming runoff season remain nearly the <br />same as last month's forecasts. Forecasts range from only 66% of average at the Roaring Fork at <br />Glenwood Springs, to 99% of average at the Inflow to Dillon Reservoir. <br />