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• <br /> RIO GRANDE BASIN <br /> Basinwide Conditions Assessment: <br /> The SWSI value of +1.7 indicates that the current SURFACE WATER SUPPLY INDEX <br /> Rioande <br /> conditions are above normal. Snowpack measured on June 1 s o- Basin" <br /> was 52%of average. Winds throughout the Rio Grande basin <br /> caused sublimation of the snowpack which have contributed W 3- <br /> to reduced runoff projections for 1991. Precipitation : " • 'Lk_ :.. .1 <br /> measured 116% of average for the month and is 122% of 2- 1:: I",_ r C.: L : <br /> average for the water year. Streamflow conditions on the Rio 1- 1- ,, , ,:i,4 <br /> Grande and its tributaries in the San Luis Valley were above i ° -4E.. 1 1. <br /> average for the month. Flow at the key index gaging station, _,_ <br /> Rio Grande near Del Norte, averaged 2939 cfs for the month • - 't <br /> cc -2- r <br /> as compared to the historic monthly average of 2420 cfs. O - <br /> Flow at the key compact gaging station, Conejos River near '3 <br /> Mogote, averaged 1166 cfs. The spring runoff started in .......L.............................._.........., ...........1- <br /> JAN92 JAN93 JANS4 JAN 5 JANI6 JAN97 JAN99 JAN92 JANO° JAN01 <br /> earnest the last half of May. The peak daily flow at Del Norte / <br /> was 4580 cfs on May 21. The Conejos River peak daily flow <br /> was 1840 cfs also on May 21. Above average storage occurred <br /> in basin reservoirs in May bringing overall content to near <br /> average. Rio Grande Reservoir increased storage (usable) to <br /> 24,700 acre-feet on June 1st. .Soil moisture improved R l O GRANDE NA. DELNORTE <br /> FLOW <br /> significantly due to above average precipitation. H`WArI94 YEAR <br /> Outlook: 0 9 <br /> An average runoff is now projected. Streamflow I0 8 - <br /> forecast is lowest in the Saguache Creek drainage at 76% of • °7 <br /> average and is highest in the San Antonio River drainage at a E <br /> 135%of average. Streamflow for the Rio Grande mainstem at -- °° <br /> Del Norte is forecast to be 92% of average. Cooler weather 1 0.4 <br /> slowed runoff in late May. However, it is doubtful that peak 0.3 <br /> flows which occurred in May will be exceeded this year. As e.2 <br /> a result, reservoir storage is not likely to come back into a.1 <br /> priority until this fall. ° <br /> Oct Nov Oat Jan Feb wren *Pr 11 Nay JUMP July Aup SORt <br /> 1.01114 <br /> Administrative/Management Concerns: o VET[1657) + my[w777 0 Are • ,sta, <br /> The forecasted flow for the Rio Grande and the <br /> Conejos River has continued to be downgraded. This <br /> reduction in forecasted flows has decreased Colorado's <br /> obligation under the Rio Grande Compact. The curtailment Rio Grande Bas I n Reservoir Supplies <br /> on the Conejos River was reduced to 35%. The curtailment 26 <br /> on the Rio Grande was reduced to 13%. If the forecasted 24- <br /> flows are reduced further additional reductions in the 2°22�, <br /> curtailments may be made. The Closed Basin Project is still = <br /> on target and is meeting the water quality standard outlined ; J// <br /> in the enabling legislation. The major concern over the next di 14 <br /> two months will be to maximize delivery of water to Colorado ;g 12 , <br /> water users while meeting compact obligations. <br /> s� a,,'7/Ae <br /> Public Use Impacts: <br /> The projected runoff should provide an adequate z <br /> supply of water to both agriculture and recreation. The ..//////2'\ <br /> Rio Grande Plater. SantaNer 1■ <br /> possibility of localized flooding still exists. <br /> ® Aug. 3/31 content• ® 5/31/111 Contents <br /> 5 <br />