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<br />ARKANSAS BASIN <br /> <br />Basinwide Conditions Assessment <br />The SWSI value of -1.4 indicates that for April the <br />basin water supplies were slightly below normal. The Natural <br />Resources Conservation Service reports that May 1 <br />snowpack was 107% of normal. Flow at the gaging station <br />Arkansas River near Portland was 291 cfs, as compared to <br />the long-term average of 431 cfs. Storage in Turquoise, Twin <br />Lakes, Pueblo, and John Martin reservoirs totaled 78% of <br />normal as of the end of April. <br />There is a sharp distinction between the northern <br />and southern drainages in both snowpack and forecasted <br />runoff, with the southern drainages being well above <br />average and the northern drainages, including the <br />mainstem, below average. <br />Ditches below John Martin Reservoir called for <br />water from the reservoir on April 1, 2005 triggering <br />. distribution of conservaiion storage into accounts per the <br />1980 Operating Agreement for John Martin Reservoir. Cool, <br />rainy weather in early April tended to reduce the demand for <br />reservoir releases and heavy inflows into John Martin <br />Reservoir from the Purgatoire River caused the distribution to <br />take all of Aprii to complete. <br />The Arkansas River call started at Fort Lyon Canal's <br />second water right (3/1/1887) and ended on the same call <br />with a few days slightly junior and a few days slightly senior <br />to that river call at different points throughout the month. <br />Flows from southern tributaries were very strong in April even <br />though the flows through Pueblo Reservoir were fairly weak. <br />Total storage from November 1, 2004 through April <br />3D, 2005 in John Martin Reservoir was approximately a net <br />of 59,500 acre-feel. The storage in April alone exceeded <br />35,000 acre-feel. <br /> <br />< <br /> <br />Administrative/Manaoement Concerns <br />This is the first year of operation under some of the. <br />revisions instituted due to the Inter-Governmental Agreement <br />between Pueblo, Colorado Springs, Aurora and several other <br />entities. A substitute water supply plan is in place that allows <br />storage of unexchangeable return flows by participating <br />entities in Holbrook Reservoir for subsequent exchange at <br />times of higher flows. <br /> <br />May-05 <br /> <br />~~ <br /> <br />~ <br /> <br /> <br />~ <br />> . <br />~ <br />c <br />z <br />-., <br />~ <br />c <br />< <br /> <br />. <br /> <br />4 <br />..Ion-t8 JtnIil"JIn.llIl ...,.99 JIr>(O .JIn.O'I Jln.<l1: Jon<I3 Jan..04 JIln..Cl5 <br />-,- <br /> <br />~ fWCR tR R:RI\.}N), F\..ON B'f Mlffi 'I9R <br /> <br />1,:;00,(0) <br /> <br /> ----- <br /> / <br /> / <br /> / / - <br /> /' <br /> ,/ / <br />-d <br />" <br /> <br />1l1,00J,(0) <br />~ <br />.:i. rm.rm <br />;:: <br />o <br />~ <br />~ 6JJ,00J <br />> <br />~ <br />~ 400,(0) <br />::> <br />" <br /> <br />;m,rm <br /> <br />o <br />Q1""""""""'MIll1Ilpl"""""'.uy"""" <br /> <br />-a-'v'\Er(1004) <br /> <br />~CRY(2XI2) <br /> <br />-+-A\G <br /> <br />-*-;m; <br /> <br />~AThEFaEFM)RS <br /> <br />''''"" <br /> <br />'<<>,aD <br /> <br /> <br />"'JJnl <br /> <br />.. <br />.. <br />~lro.o:o <br />. <br />.; <br />~lD,OOJ <br />B <br />U) <br />~6.),lXO <br />. <br />. <br />::> <br /> <br /><<>,aD <br /> <br />""'" <br /> <br />o <br /> <br />........., <br /> <br />F\JEtio <br /> <br />BA'>Q.lWDQ:rieris <br /> <br />-nn,..o.. <br />. <>>3>1>;"""'" <br /> <br />lWo""" <br /> <br />4 <br />