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<br />Chapter I - Introduction <br /> <br />The State Engineer restricted Ryan Gulch Reservoir storage eight (8) feet below the dam <br />crest, which equals 645 AF at gage height 27.6 feet, due to an inadequate spillway capacity and <br />excessive seepage on February 15, 1978. In February 1984 the State Engineer's Office (SEO) <br />submitted another letter requesting that design of the repairs be submitted or additional storage <br />restrictions would be imposed. A toe was constructed in 1994 to control the seepage from the dam. <br />The Company relies solely on the Ryan Gulch Reservoir to store water for their shareholders. The <br />SEO has the ability to require the dam to be breached if these deficiencies are not addressed. <br /> <br />The purpose of this feasibility study is to select a financially sound alternative to rehabilitate <br />Ryan Gulch Dam, which will enable the Ryan Reservoir Company to deliver their full water decree <br />in a safe and expeditious manner to meet shareholder's present and future water requirements. <br /> <br />Ryan Gulch Dam is located in Larimer County on Ryan Gulch tributary to the Big <br />Thompson River as shown in Figure 1-1. Ryan Gulch Reservoir collects waters from overland flow <br />and groundwater seepage from the 12.36 square mile contributing watershed. The reservoir is filled <br />once a year and releases are made to the Big Thompson River. The shareholders then draw water <br />directly from the Big Thompson River for irrigation purposes in exchange for the reservoir releases. <br /> <br />~ ; <br /> <br />Several dam rehabilitation alternatives were developed, which address spillway adequacy, <br />embankment and foundation seepage, and outlet works safety. The spillway alternatives are <br />classified in two categories: I) structural and 2) non-structural. Four spillway alternatives were <br />considered in the structural category and one for the non-structural alternative. Two alternatives <br />were developed for controlling the seepage from the reservoir and one alternative was developed for <br />the rehabilitating the outlet works. <br /> <br />The Company will apply for 75 percent of the project cost through a Construction Fund loan <br />from the CWCB and could finance the remaining 25 percent of the construction cost with <br />contributing funds from lake front property owners and increased water assessments. <br /> <br />C:\WQRK\PROIEcrSIRYAN\FEASREPQRl\RY ANRPT_OOC <br /> <br />I <br /> <br />January 12, 1999 <br />