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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />Streamflows in the Little Snake River average about 400,000 acre-feet per year at <br />the Lily gage near the mouth. At the Dixon gage, located higher in the basin with a <br />drainage area of 988 square miles, the average annual flow is about 350,000 acre-feet. <br />A majority of this water is the result of snowmelt, with more than 90 percent of the <br />annual flow occurring in the March to July period. <br />Diversions for irrigation along the main stem and tributaries represent the largest <br />uses of water in the basin. Water for municipal use is also provided from streamflow, <br />although the amounts are much less than for irrigation. <br />1.4 SUBJECT WATER RIGHTS <br />The purpose of this study is to quantify the downstream flow impacts which might <br />result due to the development of the reservoir projects defined under the water rights held <br />by P&M and CRWCD. These water rights are termed herein "subject water rights" and <br />are presented in Table 1. Copies of water rights decrees and available application maps <br />are given in Appendix A. The locations of the P&M and CRWCD projects in the Little <br />Snake River Basin as well as the proposed Sandstone Reservoir are shown on Figure 2. <br />The projects are described further in the text. <br />5