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. . RIO GRANDE BASIN <br /> l_ <br /> Basinwide Conditions Assessment: <br /> The SWSI value of -0.4 indicates that the current SURFACE WATER SUPPLY INDEX <br /> conditions are near normal. This represents a significant s Cram!.13"'" <br /> nprovement from conditions on March 1, 1990, when the ,_ <br /> SWSI value was-3.2. Snowpack measured on March 1, 1991, <br /> 1r 3- . <br /> . <br /> was 92% of average. A series of storm events the first week - , , . . . <br /> of March deposited a significant amount of snow in the San 2- . 1-, I .IL. me a <br /> Juan Mountains that is not accounted for in the March 1st 1 1- ' - . ; Ill ' . , 1 <br /> SWSI value. Precipitation measured 78% of average for the 1 G <br /> II <br /> month of February. Streamflow conditions on the Rio Grande - .1_ 'k _ J <br /> and its tributaries in the San Luis Valley were average for the _ 'k ' <br /> month. Flow at the key gaging station, Rio Grande near Del a 2r <br /> Norte, averaged 195 cfs for the month as compared to the "3- <br /> historic monthly average of 182 cfs. Flow at the key compact <br /> .ANB1 JANB2 JANBJ JANO4 JAWS JANBB J41187 JAMB. .IAMB! JAMS@ JA191 <br /> gaging station, Conejos River near Mogote, averaged 52 cfs. „.,,,,,,,,, <br /> Above average storage occurred in basin reservoirs in <br /> February, but overall storage is still only 90% of average. <br /> Storage in Rio Grande Reservoir is 11,100 acre-feet while <br /> storage in Platoro Reservoir is 10,100 acre-feet. <br /> Soil moisture conditions are good even though the snow cover <br /> on the Valley floor has dissipated. RIO GRANDE NR. DELNORTE <br /> 170 FLO,BY WATER YEAR <br /> Outlook: <br /> Adequate storage capacity exists for normal to above ,: . <br /> normal runoff. Streamflow forecast is lowest in the Saguache � - ...--...--.---'--ar--<- <br /> Creek drainage above Saguache at 91% of average and is j 120 <br /> " -.--1"'-....--.---..--- <br /> highest in the Culebra Creek drainage at San Luis at 124%of a I 1� <br /> average. Streamflow for the Rio Grande mainstem at Del 'i '° �;r__.-.:-.-1'Norte is forecast to be 103% of average. „ �-� <br /> Administrative/Manastement Concerns: '° <br /> 40 <br /> The entire combined flow of the Conejos River and <br /> Rio Grande (247 cfs) was delivered to the stateline during the 20� NorJ." - - c" <br /> month of February to satisfy 1991 compact obligations. This 14 r,,, <br /> CI 111•C1187) + oft c1/77] 0 AVG A 1/11 <br /> amounted to 13,694 acre-feet. A total of 35,000 acre-feet has <br /> been delivered this water year to the stateline. The Closed <br /> Basin Project has contributed 4,480 acre-feet of that amount. <br /> These winter deliveries help reduce the curtailment of <br /> water rights during the irrigation season. <br /> Rio Grande Basin Reservoir Supplies <br /> Public Use Impacts: 17 - <br /> Wolf Creek ski area has the greatest reported base in ;4�/ j <br /> the state with 120 inches. This has resulted in a significant <br /> increase in skier days as compared to last year. The near i ;; <br /> normal snowpack should provide ample supplies for fishing 1 11 ti <br /> and rafting during the late spring and summer months as well a J <br /> as a more adequate irrigation supply than has been available g B \ <br /> in the last threePP y :` 7 i://N <br /> years. I s <br /> - , <br /> 4 <br /> _./-\ <br /> i /\ <br /> a , <br /> ii IG Grw.g1 AIsLOro S mcsMar11 <br /> ® AVp. 2/21 CpK•"tw ® 2/28f91 CO"tw"tS <br /> 5 <br />