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<br />, <br /> <br />IV-3 <br /> <br />In addition, the legal demand for water on the lower St. Vrain Creek <br />is very large, especially during the irrigation season. The exact demand <br />from St. Vrain Creek water rights was not determined for this report be- <br />cause of the extensive nature of such a study. From past work, however, <br />we know that the demand for St. Vrain Creek water is great both within <br />the basin and further downstream on the South Platte River. An example <br />of this irrigation season demand is given by the fact that junior diverters <br />(adjudicated after 1900) on St. Vrain Creek are shut off by senior South <br />Platte diverters almost every year during the irrigation season extending <br />into October. <br /> <br />We would recommend that the AIlenspark Water District proceed to establish new <br />water rights on Willow Creek and Rock Creek. The new Willow Creek rights <br />could be necessary for any expansions of use in the Willow Creek basin and <br />the Rock Creek rights are necessary if it is necessary to obtain water from <br />Rock Creek. <br /> <br />These water rights would be junior to conditional rights granted to Narrows <br />Reservoir and it is possible that a winter time call would originate <br />from this project and affect Allenspark. These new rights at Allenspark would <br />also be junior to all of the present storage reservoirs in the South <br />Platte River. To provide a legal right to divert water when the junior <br />priorities are called out of the stream, a senior right along St. Vrain <br />Creek should be purchased and the right to divert transferred upstream to <br />Allenspark. <br /> <br />A list of senior water rights on St. Vrain Creek which would be appropriate <br />for further study for possible acquisition are summarized in Table IV-B. <br />