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Introduction The East Fork Mutual Irrigation Company (EFMIC) was formed to provide irrigation water to the Troublesome Valley. The shareholders irrigate approximately 4,000 acres with a peak flow of 75 cfs of water that is diverted from the East Fork of the Troublesome Creek. Approximately 1,060 feet of 72-inch diameter corrugated metal pipe (CMP) was installed in May and June of 2003 to limit seepage from the ditch into a landslide area that originally occurred in 1998. Following installation of the CMP the ditch was again filled in June 2003 and a second landslide developed as a result of leaking from the CMP pipe joints. The second landslide occurred in an area located several hundred feet downstream of the first landslide. Soil nails were installed in the scarp faces of the landslides to stabilize the soils behind the scarp faces and ~ to prevent the slope failures from propagating upslope into the ditch and pipe, as well as the service road that runs along the ditch. To limit the joint leakage, the EFMIC has installed leak-proof bands inside the pipe at the joints. A headwall and endwall are proposed for the upstream and downstream ends of the pipe to help limit prevent under seepage and erosion. In addition, the scarp faces and debris flows require further stabilization to prevent further failures and reduce erosion. The EFMIC has completed stabilization of the landslide scarps and installation of the pipe joint bands and would like to complete as much of the remaining work as possible in the falUwinter of 2003 and 2004 in preparation for the upcoming irrigation season. Extending the limits of the CMP upstream and downstream is also under consideration at this time, however, it is not part of this feasibility study. Project Sponsor The East Fork Mutual Irrigation Company is registered with the State of Colorado. There are 7 shareholders and 1000 shares of the stock. The board of directors determines the annual assessments to be paid by the shareholders. If assessments are not paid, other shareholders can pick-up the assessment. If the assessment is not paid within a year of the due date. The stock and water right is turned over to the shareholder paying the assessment. Articles of Incorporation and the by-laws are included in the report. Project Service Area and Facilities ~ The East Fork Mutual Irrigation Company provides irrigation water to 7 shareholders with approximately 4,000 acres of irrigated lands. The irrigated lands are used for cattle ranching, pasture and growing hay. The ditch length is approximately 13 miles and extends from the diversion structure on the East Fork of the Troublesome Creek to the end, which is located in the southwest comer of the Troublesome Valley. A vicinity map showing the approximate location of the subject project, as well as a map showing the ditch alignment are shown in Appendix A. Hydrology and Water Rights The East Fork Ditch (Haypark Canal) water rights are from the East Fork of the Troublesome Creek. A peak flow of 75 cfs with an appropriation date of August 5, 1959, provides water to 7 shareholders. Water is diverted in early April and is turned off in late July in normal years of use. Approximately 8,000 acre- feet of water will be used during an average irrigation season. East Fork Ditch Repair Feasibility Study December 2003 Page 5