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• <br /> I*- <br /> SOUTH PLATTE BASIN <br /> t Basinwide Conditions Assessment: <br /> The SWSI value of 2.2 indicates that for June the SOUTH PLATTE RIVER BASIN <br /> asin S <br /> water supplies were above normal. Reservoir storage, Surface Water supply ' ""to y <br /> the key component in this basin in computing the SWSI value, 4 <br /> • <br /> was 102%of normal on June 30. Storage in the major plains , . ._ <br /> reservoirs, Julesburg, North Sterling, and Prewitt, decreased 3 f�., .:�= I_ <br /> by 22,353 acre-feet during June and are at 70% of capacity. 2 - 4744. "' . L 1 . 1. <br /> Storage in the upper basin reservoirs,Cheesman,Eleven `' _ �- <br /> g majorPP -�irtrtor, -- <br /> Mile, Spinney, and Antero, increased by 13,011 acre-feet and i D - <br /> are at 99%of capacity. The National Weather Service reports _1 <br /> basin precipitation as 67%of normal during June. The mean <br /> a _2 <br /> daily flow of the South Platte River at the Kersey gage was <br /> 640 cfs, as compared to the 1961-1993 June average of 2,853 3 <br /> cfs. Flow at the Colorado/Nebraska state line averaged 62 cfs. -4 <br /> JANBS JAN86 JAN87 JAN66 JAN89 JAN90 JAN91 JAN92 JAN93 JAN94 <br /> The month of June was the hottest June on record MONTH/YEAR <br /> and was also very dry. Stream flows were very low, with <br /> runoff peaks occurring about 3 weeks early due to hot <br /> weather. Flows at the state line were reduced to less that 30 <br /> cfs by the end of the month. Due to the limited stream flow, <br /> demands for water are being made by relatively senior water SOUTH PLATTE RIVER NR. KERSEY <br /> rights as compared to a normal year. Reservoirs were put into 2 9 FLOW BY WATER YEAR <br /> . <br /> use earlier than normal, resulting in currently reduced. 2.6 <br /> reservoir levels. Because of the limited surface water supplies, z 2 <br /> any stored water will become very valuable this year. During i 2 . <br /> the month of June many diversion structures that normally are <br /> able to take water from the stream system had their diversions 4 1 8 <br /> OJ_ 1 4 <br /> reduced or totally called out. Supplies in the lower end of the u a 12 <br /> outh Platte are especially low. S 1 <br /> 1 <br /> 0.6 • <br /> Outlook °4 <br /> The July outlook for surface supplies is for continued 0.2 f <br /> low flows and reduced water availability. At the current rates ° <br /> Oct Pew Dec .Jan Feb Parch April May Juno July Aug Sept <br /> of use, many of the irrigation reservoirs will begin to get very MONTH <br /> 0 WET C 1863) O O X(1964) A AVG X 1994 <br /> low in mid August. Continuation of the current conditions for <br /> the rest of the summer will definitely create an adverse impact <br /> on crops throughout the basin. <br /> Public Use Impacts REPRESENTATIVE RESERVOIRS <br /> Recreational water uses do not appear to have been 2sa SOUTH PLATTE RIVER RESIN <br /> significantly affected due to the low stream flows during June. 240 <br /> -�7 <br /> Streams were low but available for fishing,rafters and canoers ///_\\\ <br /> 200- <br /> had to watch the conditions closely to avoid low flow reaches i 155 <br /> but were able to float. Reservoirs were still high enough for vr~ 160 <br /> flat water users. The recreation use outlook for July is for a� 140 <br /> reductions in use due to low stream flows and reservoirs. h 2 12° <br /> Cherry Creek and Chatfield Reservoirs will probably reach . '°° �� <br /> lower levels than have been experienced for 10 or 20 years. 3 B° J�f�\\ ��\�\ �\�\ <br /> River flows are presently the lowest since 1977 and will limit �� f <br /> uses unless rains come to build them up. 2D <br /> DI I Ion Noraetooth Eley.n MI to Cheo s:in Jackson Barr Lake <br /> ® Avg 6/30 Contents ® 6/30/54 content. <br /> 3 <br />