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. . CHAPTER V PLAN OF DEVELOPMENT . Phvsical Plan Julesburg Reservoir consists of a 28,200 acre-foot reservoir retained by four major earth dam embankments and one minor embankment. These embankment fills range in vertical height from 15 feet to about 65 feet, and total about 8,600 feet In length, The outlet structure for the reservoir is located on Dam No.4 and delivers water directly Into the HighllneService Canal. The existing outlet consists of a three-conduit concrete arch tunnel, 150 feet In length, with three cast iron control gates in a tower structure located about 90 feet from the Inlet structure, The embankment fill height at the outlet works Is about 33 feet. This outlet structure dates to the original dam construction In 1904, The general layout of the JUlesburg Reservoir dam embankments are shown In Figure 1, . . . Since 1984, Julesburg Irrigation District has been investing in the rehabilitation of the Julesburg Reservoir dams, On both Dam Nos, 2 and 3, toe drain systems, filter drainage blankets, and earth-fill stabilizing berms have been installed, These Improvements control embankment and foundation seepage, and Improve the slope stability of the earth-fill embankments, Similar repairs are recommended for Dam Nos. 1 and 4, but of a much reduced scope, It Is believed these repairs can be performed by District personnel as routine maintenance Items. The outlet works require extensive repairs or rehabilitation to ensure water tightness and structural integrity, This chapter describes the proposed rehabilitation measures to be performed with the CWCB Construction Fund loan, . . It is the District's proposal to completely replace the outlet structure, Including the conduits, gate control tower, and control gates, and also the embankment fill adjacent to the outlet (a portion of Dam No, 4), The concrete In the existing conduits is old and shows signs of severe deterioration, including areas of very soft concrete, fractures and cracks, seepage and areas of exposed reinforcement. The control gates show considerable leakage, one is slightly bent, and the overall Integrity for long-term future use Is unknown. A report prepared by the State Engineer, summarizing an October 13, 1990 Inspection of the outlet conduits is enclosed in Appendix H, The proposed repair measures are shown in Figure 4, located at the back of this report, . . 13 .