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I I I I I I I I I I I I I I I I I I I DAM HISTORY The Carl Smith Reservoir Dam was constructed in 1948. The original plans for construction were filed with the State Engineer and approved on March 20, 1948 (File No, C-473). According to the drawings a smaller embankment dam, referred to as Patterson No.3, existed at the site and was to be enIarged in accordance with the 1948 drawings. The date of construction of the original dam is not know but was most likely in the early 1900's. Based on the current dam configuration the dam was not ~nIarged to the height and size shown on the 1948 plans. The current dam crest is 12 feet lower than the plans and the slopes on the dam are significantly steeper than the plans. A second set of plans (File No, C-473A) were approved by the State Engineer on July 14, 1965 for the construction of the 3D-inch diameter outlet conduit. These drawings show details and outlet locations that are different than the original plans filed in 1948. Carl Smith Reservoir is an off-channel structure which is filled through a controlled inIet canal to Leroux Creek. The reservoir has a small drainage basin of approximately 845 acres. The dam is approximately 55-feet in height; approximately 1500 feet in length; has three outlet conduits of which only two are operable; has 2,7 to 1 upstream slopes and 1.7 to 1 downstream slopes; has a 90-foot emergency spillway which provides approximately 5-feet of freeboard; and, stores approximately 800 acre-feet of water to the spillway crest. Appendix K includes a reduced copy of the plans on file with the State Engineer and shows a' current surveyed cross section of the dam. WATER RIGHTS The company's decreed water rights and appropriations on Carl Smith date back to 1963. The first appropriation has a Priority No. J-272 with a decree dated August 5, 1963 for 320.00 acre- feet of water, ABSOLUTE and a Priority No, J-272 for 536 acre-feet, CONDITIONAL; a priority No. J-272 with a decree dated March 20, 1964 for 398.13 acre-feet of water, ABSOLUTE. Appendix D contains a graph of the storage records for Carl Smith Reservoir maintained by the State Engineers Office. The records available date back to 1970 which provides 27 years of record. The reservoir in those 27 years appears to have been filled to near capacity, which by the SEO records appears to be at approximately 800 to 850 acre-feet, 23 out of 27 years, There is no gage rod at Carl Smith and the storage volume is not exactly known. Various elevation versus storage charts have been used over the years. However, based on the SEO records, we believe the capacity to be approximately 800 to 850 acre-feet. From our current survey data the volume from elevation 8225 to the spillway is 732 acre-feet. The lowest point in the reservoir is approximately 8200 feet with a surface area of water of approximately 2.5 acres, Carl Smith Dam Feasibility Page 6