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ti <br /> SAN JUAN/DOLORES/ANIMAS BASIN <br /> Basinwide Conditions Assessment: <br /> The SWSI value of +3.5 indicates that for May basin SAN JUAN/DOLORES/ANIMAS RIVER BASINS <br /> Surfaco Water Supply Index History <br /> water supplies were well above normal. The Soil Conservation <br /> 5 <br /> Service reports May 31 snowpack as 135% of normal. The <br /> National Weather Service reports May precipitation as 132% of . <br /> 3 7« <br /> normal. Storage in McPhee, Vallecito, and Lemon reservoirs ; • <br /> totaled 122% of normal on May 31. Flow at the gaging station 2 <br /> Animas River near Durango averaged 3,648 cfs as compared to 1 F µ <br /> : :) <br /> the 1961-1991 May average of 2,133 cfs. The Animas River g ' 1'-I <br /> peaked at 6,850 cfs on May 28, the same day many other basin <br /> rivers also reached yearly highs. Vallecito Creek peaked at 1,290 2_ <br /> cfs and the Dolores River peaked at 5,530 cfs. As was expected, <br /> May runoff numbers showed high flow compared to normal, with 3- Y <br /> amounts reaching 165% to 183% of normal. <br /> JAN84 JAN85 JAN88 JAN87 JAN88 JAN89 JAN90 JAN91 JAN92 JAN93 <br /> MONTW YEAR <br /> Precipitation varied; Durango received its average 1.08 inches, <br /> other rain storms were sporadic and heavy in certain locales. <br /> Most mid-elevation snowpack melted quickly toward the end of <br /> May. However, significant water content remained in some mid- ANIMAS RIVER NR. DURANGO <br /> elevation spots such as Spud Mountain. Little melt was occurring F BY WATER YEAR <br /> in the high elevation snow courses until late May due to scattered 5.9 +f° <br /> cloud cover and cool temperatures. The snow remains in deep B <br /> canyon piles or on northern slopes. It is hoped there will be a 0 7 <br /> slow extended summer melt. <br /> 0 <br /> = 0 5 <br /> Reservoirs obtained most of their filling during the month and 0, <br /> stood at 120% or more of average going into June. The S <br /> anticipated bank full releases did not occur due to the cool I 5.a <br /> temperatures. 0.2 <br /> 0. <br /> Oct Nov Dec Jan Feb March Apr}1 May June July Aug Sept <br /> MONTH <br /> 0 WET(1973) 0 DRY[1977) A AVG )[ 1993 <br /> REPRESENTATIVE RESERVOIRS <br /> DOLORES-ANIMAS RIVER BASINS <br /> 400 <br /> 350— <br /> 300 <br /> !' 250 <br /> ■nn <br /> •C <br /> $" ::: <br /> 50 /".s. <br /> McPhee Valleclto Lemon <br /> EZI Avg. 5/31 Contents ® 5/31/93 Contents <br /> 9 <br />