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SOUTH PLATTE BASIN May, 1997 —sinwide Conditions Assessment: The SWSI value of 3.2 indicates that for April the SOUTH PLATTE RIVER BASIN basin water supplies were well above normal. Reservoir ELK;,amply Ines Nlctory storage,the major component in this basin in computing the SWSI value, was 104% of normal as of the end of April. I lil. I111.Ii1Ll ▪ s ISto a in the major plains reservoirs: Julesburg, North I. IIl,plll,l! II 11,11 I INl IIIII UI{I11111 H Sterling, and Prewitt, decreased by44,737 acre-feet during 11 ll1 I !, nl nl1!Illlllnn n s Ilfll.nl H 41 1 11,1111 Ili IHI M11111.u �M� IIIIIIIII 11, �,11 MIL, .11111 111111 II I III IIIII IM111!III II April and are at 64%of capacity. Storage in the major upper 1 Inn IIII Lfl mill. I I III IIIl III III I{III IIIIIII III II ��++��,, ' 11111 1111 1I 1111111 II 111111 1111111 1111111111 I I 1 Ili I I II!!11111111111 I I basin reservoirs:( lleesman,Eleven Mile,Spinney,and Antero, on Illllf ,1111111 IIIIIIIkII III 1111 I I 11111 llllkklilkk II decreased by 4,977 acre-feet and are at 77%of capacity. The 1 fkl „E� National Resources Conservation Service reports May 1 snowpack as 156% of normal. The mean daily flow of the ▪ .2 South Platte River at the Kersey gage was 931 cfs, as -3 compared to the long term average of 992 cfs. Flow at the _, - JANOB JAN09 JAN90 JAN61 JAN0. JAN93 JAN91 'JAN95 JAN90 JAN97 Colorado/Nebraska state line averaged 328 cfs, compared to the long term average of 556 cfs. The first half of April was dry on the plains although snowpack for the mountains returned to above average. The lack of precipitation on the plains was unusual for April. The dry warm conditions prompted ditch companies to open SOUTH PLATTE RIVER NR. KERSEY irrigation ditches for direct irrigation. Due to the dry 1.3 , PLOW 6.WATER TEAR conditions, and since snow melt had not begun, direct flow calls affected the entire South Platte toward the end of the 1 month. Storm conditions the last week of April helped the • a 9 supply situation significantly allowing the mainstem call down stream of Denver to be removed. o o " 0.6 g8 a.s Outlook 0.4 0.3 With the good snowpack conditions and present 0.2 reservoir storage,the water supply situation is excellent. Flow 0.1 conditions will increase dramatically the next several weeks as a 0cL Npv Dec Jan F. March Ace II Mar snow melt begins. As usual, the amount of summer rain will M 0 OWhave a significant impact on late irrigation season supply. ° WET"'°� `1%J a x 1997 Administrative/Management Concerns The Northern Colorado Water Conservacy District set their unit quota at 50% delivery for 1997. This is the REPRESENTATIVE RESERVOIRS expected quota when there are abundant supplies. 210 WI/TN PLATTE RIVER BASIN790 100 \\ 170 /f\\' M` 150 • . 12a J/ S s 110 J� 7,, 7—x f71110n Narestooth Eleven Mlle Ches.en Jackson Barr Lake ® Avg.4/30°entente ® 4/30/07 Contents 3