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1 <br /> SAN JUAN/DOLORES BASIN May, 1997 <br /> "asinwide Conditions Assessment: <br /> The SWSI value of 2.6 indicates that for April the SAN JUAN/DOLORES RIVER BASINS <br /> basin water supplies were above normal. The Natural s ''°'Wet.'5`Q°'y ""`°`Y <br /> Resources Conservation Service reports May 1 snowpack as 4_ <br /> 134% of normal. Flow at the gaging station Animas River _ 4. C <br /> near Durango averaged 980 cfs as compared to the long term , <br /> 1- <br /> average of 786 cfs. Storage in McPhee,Vallecito, and Lemon . ' a <br /> reservoirs totaled 112%of normal as of the end of April. 1 '- - - -� <br /> On April 4 a storm dumped a new layer of snow i ° ,,,,, y{ - �./ <br /> across the area, with Durango receiving over 1 inch of _ , ,� , w v <br /> precipitation. The storm broke a dry spell lasting since .,�_' `+ C v <br /> February and boosted the soil moisture. Wind has been a o - , ° <br /> factor this spring, creating some loss of higher elevation -3- c <br /> snowpack. 1 .T �.... , _. . <br /> JAN99 JAN89 JAN90 JAN91 JAN92 JAN9/ JAN94 JAN95 JAN96 JAN97 <br /> The highest stream flows in April occurred on the .ONiW YEAS <br /> 22nd, with the Animas River reaching 1,580 cfs, and the <br /> Dolores River nearly as high. Flows across the San Juan Basin <br /> were near average for the month. Lower elevation streams <br /> ran high but no flooding was reported. <br /> In Durango precipitation totaled 2.09 inches during ANIMAS RIVER NP. DURANGO <br /> April, and 20 inches (174%of normal) so far this water year. 450 - F1ON Err 9*TEA 0EAa <br /> 400 <br /> Outlook <br /> With the high snowpack the chances of an extended i <br /> runoff are good. An extended high runoff period would allow + '°° <br /> complete storage in reservoirs and ample water for uses up to .1 2,0 <br /> vi <br /> ~V <br /> Administrative/Management Concerns I ,S° <br /> No calls for river administration have occurred yet. <br /> Area reservoirs gained significantly during April. <br /> McPhee Reservoir stored to within 1 foot of spilling before ° <br /> Oet Ft1V C1.c Jen F. Vac C91 9*1 I NAV <br /> delivery releases were ordered. ,CM71M <br /> A sinkhole was discovered on the Durango City WET"q'� ° ° r,977, p AVG >< 1397 <br /> Reservoir which appeared to be old in nature and related to <br /> a complex pipe system within the dam. Efforts were being <br /> made in early May to repair the problem,while supplying the <br /> city with water directly from the Florida and Animas Rivers. REPRESENTATIVE RESERVOIRS <br /> 0Ot.o>Es-ANIW$i71v6R BASIN <br /> 400 <br /> 950- <br /> i n ZS0 /\ <br /> gi <br /> . <br /> ar i 20° <br /> :///\\, 4 <br /> 150 <br /> 100:///:///7\\*\ \ <br /> s " /\ <br /> 0 {////+\ \N <br /> A1cPpoe Va I I K I t° Leman <br /> ® Avg.4/30 Cant... ® 4/30f97 Content. <br /> , <br /> 9 <br />