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RIO GRANDE BASIN <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 1.5 indicates that for May the RIO GRANDE BASIN <br /> Surface Motor Supply Index History <br /> asin water supplies were slightly above normal. Storage in s <br /> Platoro,Rio Grande, and Santa Maria reservoirs totaled 168% 4 <br /> of normal on May 31. The National Weather Service reports basin precipitation as 159% of normal during May. Flow at 3- : <br /> the gaging station Rio Grande near Del Norte averaged 2,529 • _ - <br /> cfs, as compared to the 1961-1993 May average of 2,441 cfs. 1 <br /> The Conejos River near Mogote had a mean monthly flow of D y"" "� f",,; `" r- <br /> _u �I h <br /> 1,159 cfs. u I <br /> Stream flow in the basin during May was, in general, r, <br /> a -2_ <br /> slightly below last year, but very near historic averages. <br /> Weather conditions in the San Luis Valley were warmer than 3- <br /> average. The average monthly temperature of 52.3° in -4 <br /> JANBS JAN80 JAN87 JAN98 JAN09 JAN90 JAN91 JAN92 JAN93 JAN94 <br /> Alamosa was 1.9°above normal. The average daily high was YEAR/MONTH <br /> 69°, while the average daily low was 36°. Alamosa received <br /> an above average amount of precipitation, 1.78 inches,during <br /> May, which is 1.14 inches above normal. <br /> Outlook RIO GRANDE NR. DELNORTE <br /> Some snowfall occurred at the higher elevations 1 , FLOW BY WATER YEAR <br /> during May. This continued the run of late season snowpack i <br /> accumulation this spring. The main stem of the Rio Grande <br /> should still experience below average stream flow this D,e <br /> summer. However,tributaries located in the Sangre de Cristo a 07 <br /> and southern San Juan ranges should experience average to o f 0 6 <br /> above average stream flows throughout the summer. At LL= Ds <br /> ]V <br /> resent, conditions appear to be very favorable for reservoirs s 4 <br /> i the upper Rio Grande basin to reach near capacity storage 0.3 <br /> levels. 0 2 <br /> 01 <br /> Administrative/Management Concerns <br /> Oct Nov Dx Jan Fab March Apr I May Jun* July Au4 Sept <br /> Precipitation in the valley during May eased some of MONTH <br /> 0 'YET(1997) O DRY(1977) O AVG x 1994 <br /> the irrigation demand. However,the expected water shortage <br /> will affect many irrigators relying on the Rio Grande natural <br /> flow for their supply., There has been little or no report of <br /> damage due to flooding this spring. <br /> REPRESENTATIVE RESERVOIRS <br /> Public Use Impacts SO RIO GRANDE BASIN <br /> Stream flow and reservoir storage have provided 45- <br /> adequate water supplies for irrigators so far. Outdoor 40_ <br /> recreational activities and tourism have not been adversely 35_ <br /> affected by water conditions in the basin. rl n 30_ <br /> a <br /> �►°n 2 5— <br /> � <br /> WC, <br /> zor <br /> 15\ \ <br /> Rlo Grande Pletaro SantaAier le <br /> ILL] AVp 5/31 COntente ® 5/31/94 Contents <br /> 5 <br />