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. 6013J5 United States Department of the Interior BUREAU OF RECLAMATION Boulder Canyon Opemtions Office P.O. Box 61470 Boulder City, NV 89006.1470 RECEIVED SEP 29 1997 Colorado Water Conservation Board IN REPLY REFER TO, BCOO-4600 WTR-4.10 ,,,.. "'- 3EP'25199( MEMORANDUM To: All Interested Parties From: Jayne Harki ns Manager, River Operations Subject: Estimate of 1997 Colorado River Water Use Attached are the estimates of 1997 water use for all users in the lower basin. The forecast currently indicates that total mainstream Colorado River water use by Lower Division States is about 8.4 million acre-feet as anticipated in the surplus Annual Operating Plan for 1997 with consideration for estimated unmeasured return flows. Projected 1997 water use is based on actual use for January through August 1997, users'historical use patterns, and scheduled use provided by users. Projected use for each user is being provided so that water users can monitor their use of water and avoid any overuse during the year. Because seasonal agricultural requirements can vary significantly from year to year, it is emphasized that all users should promote water conservation and plan to keep water use within their annual entitlement. We expect the actual use data contained in the projections will provide the basis for the "Compilation of Records in Accordance with Article V of the Supreme Court of the United States in "Arizona v. California" (Article V records) for calendar year 1997. As a result, we are asking that each user review the actual use data and notify us if any of the records appear to have errors. Your review of the accuracy of the records during the year will help us complete the final Article V records in a timely fashion. The final 1997 Article V records will be used to determine, among other things, the extent to which any individual users of Colorado River water may have exceeded their entitlement. In such cases, the final records will serve as the basis for requiring reductions in water use in future years in order to offset any such inadvertent overruns that may have occurred.