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<br />UPPER RIO GRANDE RIVER BASIN <br />as of May 1, 2003 <br /> <br />Mountain Snow pack. (Inches) <br /> <br />Precipitation. (OJ. of average) <br /> <br />-*-Currenl -.......-Average <br />_Maximum -+-Minlmum <br /> <br />I_Monthly DYear~lo.date I <br /> <br />2S <br /> <br /> <br />140- <br /> <br />120 <br /> <br /> <br /> 20 <br />C <br />~ <br />c 15 <br />.!! <br />. <br />> <br />;; <br />CT <br />W <br />" 10 <br />. <br />;; <br />;: <br /> 5 <br /> <br />QJ 100 <br />C> <br />E <br />. <br />> <br />.. <br /> <br />- <br />o <br /> <br />- <br />c <br />. <br />u <br />" <br />. <br />0. <br /> <br />o <br />Jan <br /> <br />Oct Nov Dee Jan Feb Mar Apr May <br /> <br />Fob <br /> <br />Ma, <br /> <br />Ap' <br /> <br />May <br /> <br />.Based on selected stations <br /> <br />Looks like the Rio Grande Basin will have to struggle through another extremely low water <br />supply season. TIle snow began melting early last month and if the rate of melt continues, most of <br />the snow in the basin will be gone before June, which is nearly two months ahead of the average <br />melt-out date. The May I snowpack measurements are only 56% of average basin-wide. Most of <br />the watcrsheds in the basin are much below average, while the Culebra and Trinchera watershed <br />is a whopping 105% of average. Precipitation was only 87% of average during April, and the <br />water year total is now 87% ofavcrage. Reservoirs in the basin contain only 59% of their average <br />storage amount for this time of year, which is only 83% of the storage amount there was last year <br />at this time. Most of the streamflow forecasts have bccn reduced from their already meager April <br />I numbers. Many forecasts are now below 50% of average. Culcbra and Costilla Crceks remain <br />the exception with forecasts at or near average. The remaining forecasts range from only 43% of <br />average at Rio Grande at Del Norte, to 78% of avcrage at the Trinchera Water Supply. <br />