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I I I I I I I I I I I I I I I I I I I 4. Repairing or replacing existing handrails and installing additional handrails; 5. Installing galvanized steel grating. The estimated cost for this work is $21,100, as shown in Table 8-6. Thurston Reservoir. Thurston Reservoir is located about 9 miles north of Lamar, Colorado, and its inlet from the Fort Lyon Canal is about 95 miles downstream from the lower diversion dam. Its purpose is to store excess canal water, thereby preventing damage to the canal; however, it is used infrequently since the Cenal Company presently has no means for conveying water from the Reservoir back to the canal. Inflow to the reservoir is supplied by the Fort Lyon Canal through the inlet structure and some 4,000 feet of unlined channel, and by groundwater and irrigation return flows, with minor inflow resulting from direct precipitation and runoff. Present usage of the water available in Thurston Reservoir appears to be limited to small amounts of pumping by others for irrigation purposes. However, the Fort Lyon Canal Compeny is presently considering the construction of a 7.5 to 15-cfs pumping plant, to be located on the north side of the reservoir, to pump water from the reservoir back into the Fort Lyon Canal. On July 28, 1982, the reservoir was inspected by the State Engineer's Office. A copy of the report submitted by the State Engineer to the Fort Lyon Canal Company is included as Appendix C to this report. As a result of this inspection, the State Engineer has mode the following recommendations: I. ''Restrict storage to a water surface elevation five feet below the lowest point in the crest of the dam at the outlet section." 2. "Request that the owners construct a service or emergency overflow section designed to insure that the reservoir is not filled to an elevation higher than five feet below the lowest point in the crest of the dam. This spillway should have a capacity equal to that of the inflow ditch to the reservoir basin." A pumping plant is proposed for construction on the north side of the Reservoir, consisting of a single 7.5 cfs centrifugal pump and motor and a single IS-inch diameter polyvinyl chloride (PVC) pipeline 1,980 feet in length (see Figure 9). The initial plant capacity would be 7.5 cfs with a total dynamic head (TDH) of 75 feet. The pumping plant would be constructed to allow the future installation of a second 7.5 cfs pump end 15- inch PVC pipeline, giving a total plant capacity of 15 cfs. The second pump would be added provided initial operation of the plant demonstrates that a sufficient sl4lply of 29