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4 r <br /> • <br /> RIO GRANDE BASIN March, 1999 <br /> t <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 0.5 indicates that for February the R I O GRANDE BASIN <br /> basin water supplies were near normal. The Natural S Surface Water Simply Index History <br /> Resources Conservation Service reports that March 1 4- <br /> snowpack is 79% of normal. Flow at the gaging station Rio .- i <br /> Grande near Del Norte averaged 203 cfs, as compared to the " _:4long term average of 180 cfs. The Conejos River near Mogote 2- :, - t -Ai: <br /> had a mean flow of 55 cfs (106% of normal). Flow to the 1 1- ,, - = <br /> stateline was 133% of normal. Storage in Platoro, Rio 1. 0 _14_ ' ti.'` �, -�,^: <br /> Grande,and Santa Maria reservoirs totaled 119%of normal as _, <br /> of the end of February. -, ...- <br /> Precipitation in Alamosa was a trace, being 0.29 0 -2. r <br /> inches below normal. The valley floor has received less than -3 4 <br /> 0.10 inch of precipitation since the first of December. -4 r 1 . <br /> JAN90 JAN91 JAN92 JAN93 JAN9. JAN95 JAN99 JAN97 JAN99 JAN99 <br /> Temperatures ranged from -5° to 58° in Alamosa. Weather YEAR/MONTH <br /> conditions in the San Luis Valley have been very warm and <br /> dry for the last four months. One local quipped that"this has <br /> been the coldest summer we've ever had". <br /> Outlook RIO GRANDE NR. DELNORTE <br /> Snowpack conditions actually declined during 170 FLOW BY WATER YEAR <br /> February. However, with the two snowiest months yet to 160 <br /> 150 - <br /> come there is still hope the snowpack can approach average 140 <br /> levels. 1 130 <br /> Recent NRCS stream flow forecasts are calling for well 4 1 <br /> 2 <br /> below average conditions in the entire upper Rio Grande basin ,� <br /> this year. Expected runoff for the Rio Grande near Del Norte LL g 90 - <br /> is just 72% of normal, and for the Conejos near Mogote only s <br /> 65% of normal. Carry over storage in the basin reservoirs 1 80 <br /> cannot counteract the effects of low runoff for most water S0 <br /> users and activities dependent on higher flows. 30 `_______.- <br /> 20 <br /> Oct Nov G.o Jan Feb March <br /> Administrative/Management Concerns <br /> MONTH <br /> _ The annual meeting of the Rio Grande Compact ° WET(1977) <br /> 87) ° °^'"° A AV0 x 1999 <br /> Commission will be held at Mabry Hall in Santa Fe, New <br /> Mexico on March 25, 1999. The public is invited to attend. <br /> The Division Engineer has received early calls for <br /> irrigation water on some of the tributaries. Diversions from Representative Reservoirs <br /> the Rio Grande and Conejos River are expected to begin 2. Rio Grande e..ln <br /> around the middle of March. 22- <br /> Public Use Impacts i 18- <br /> Winter sports enthusiasts reliant on snow cover 's� <br /> suffered through another sub-par month. s i 1 <br /> t3 ,2...". <br /> F 10 y/.\ <br /> i a/.\. <br /> i a <br /> 4 <br /> 2 0 //1\ \\// <br /> � /� ///� <br /> \\Rlo Grand. Platoro SantaMarla <br /> ® Avg.2/28 Content, ® 2/29/99 Content* <br /> 5 <br /> 4 <br />