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• RIO GRANDE BASIN <br /> SURFACE WATER SUPPLY INDEX <br /> 5 Rio Grands Basin <br /> Basinwide Conditions Assessment: 4_ <br /> The SWv SI value of +1.5 indicates that the current <br /> conditions are above normal. This represents a significant • '- 1 _; { L <br /> ,l z' <br /> improvement from conditions on January 1, 1990, when the 2- _' �r _ <br /> SWSI value was -3.4. Snowpack measured on January 1, - 'r--'_ - _. - : <br /> 1991, was 109% of normal. Snowpack is especially high in 9 a ►4* ~;. 'r---- --�, r <br /> the Conejos and San Antonio drainages at 145% of normal. <br /> Precipitation measured 148% of normal for the month of "4 " " :0 .i <br /> December. Streamflow conditions on the Rio Grande and its o• _2- <br /> tributaries in the San Luis Valley were above normal in -3- = ;111 <br /> December. Flow at the key gaging station, Rio Grande near -4 ......... .....................................................-. . y <br /> Del Norte, averaged 195 cfs for they month of December as �""°' 'A"� diMaKi '""" JAHN ''""�` JANe' JAMB �""°° JANY1 <br /> YEAR/YfARH <br /> compared to the historic monthly average of 190 cfs. Above <br /> normal storage occurred in basin reservoirs in December but - <br /> overall storage was only 78% of normal on January 1, 1991. <br /> Soil moisture conditions remain high. As a result, ground <br /> water return flows are expected to increase in the spring. <br /> RIO GRANDE NR. DELNORTE <br /> FLOW 9Y WATER YEAR <br /> Outlook: 170 <br /> Adequate storage capacity exists for normal to above ,. <br /> normal runoff. Streamflow forecast is lowest in the Saguache 140 <br /> Creek drainage above Saguache at 91% of average and is 1. 130 <br /> highest in the Culebra Creek drainage at San Luis at 124% „ 11a <br /> of average. I 10D <br /> O 90 _ <br /> G ea <br /> Administrative/Management Concerns: 7Q <br /> The Rio Grande and Conejos Rivers are both 6° <br /> currently in reasonable status under its Compact obligation. o_ <br /> The Closed Basin Project continues to make deliveries to the 30 <br /> Rio Grande which helps Colorado in meeting its overall 20 <br /> oct N,,, le Jen Feo March <br /> Compact commitments. mONWET YEAR C19e7] + oRY YEAR877) o AVG O 199 <br /> Public Use Impacts: <br /> Recreational uses at basin reservoirs have been <br /> diminished due to low water levels. Flow in the Rio Grande <br /> mainstem has been adequate to sustain the fishery. <br /> Rio Grande Basin Reservoir Supplies <br /> 17 <br /> 16- j <br /> 15- <br /> 113 4_,„ <br /> i 12 <br /> _ 11 <br /> L <br /> a 19 <br /> 1 <br /> • a Pr \ <br /> Rlo Grand. Platoro Snnta1.rla <br /> ® Avg. 12/31 Contents ® 12/31/90 Contents <br /> • <br />