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. 001308 . Draft Task 9 Technical Memorandum . The major senior ditches which lie between gages 9245000 and 9245500, and Elkhead Dam include: Ditch Average Annual Withdrawal (ac-ft) Tipton Ditch McKinley No. 1 Ditch McKinley No.2 Ditch Louis No. I Ditch Louis NO.2 Ditch Oldham No.2 Ditch Rock Springs Gulch Pitney No. 1 Ditch Pitney No.2 Ditch Pitney No.3 Ditch Pitney Pump Total 334 1,250 1,666 110 88 447 30 23 33 33 26 4,040 The State Engineers Division 6 records indicate approximately 2,000 acres presently irrigated by diversion from Elkhead Creek, approximately 900 acres which are located above Elkhead Reservoir and below gages 9245000 and 9245500. Return flows from the majority of the rights diverting above Elkhead Reservoir will return to Elkhead Creek above the Elkhead Dam and be captured in the reservoir. If an average consumptive use of 1.1 af per acre is assumed, then there is a net depletion to Elkhead Creek of approximately 1,000 acre feet per year occuring within this reach. This estimate is consistent with the information in the above table which indicates approximately 4,040 af of withdrawal by diversion. This corresponds to . an average overall irrigation of approximately 25 %. The original estimated yield of Elkhead Creek has been adjusted to reflect these delpletions which occur between gages 9245000 and 9245500 and the the Elkhead Dam. The adjusted average annual yield is 63,510 af. Aside from adjusting the estimated Elkhead Reservoir inflows to reflect historical withdrawals not accounted for in the gage above the reservoir, a listing of all water rights on the Creek was developed and reviewed. This water rights listing was developed to help identify potential future conflicts associated with the filling or use of an enlargement pool at Elkhead Reservoir with a water rights priority equal to the Juniper Project. Through this effort, water rights totaling 56.87 cfs were identified as senior to the first Elkhead Reservoir right (5,389 at) and another 57.01 cfs were identified as junior to the first Elkhead right but senior to the second right (8,310 at). Several of these rights were located below the reservoir but may have an impact on the overall water rights administration on Elkhead Creek. For example the Norvell, Starr and Smith ditches are all senior to the second Elkhead Reservoir storage right and account for an average withdrawal of 2,300 af per year downstream of the dam. 4 Ji, :,,'b1'