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<br />. <br /> <br />10,000 years ago. There is no physical evidence that the depression storage was ever <br /> <br /> <br />overtopped by flood water. It is evident that Sanborn Draw ended at the depression and <br /> <br /> <br />there is no evidence of any channel extending from the depression to the river. <br /> <br />Initially an outlet structure was constructed at the reservoir site and minor fill dams were <br />built sufficient to form Sanborn Draw Reservoir, which held approximately 16,000 acre-feet <br />of water. It first received water in 1 902. RRLC purchaseq Sanborn Draw Reservoir and <br />the associated inlet canal called Riverside Ditch. Riverside Irrigation District was formed <br />at that time to purchase 1,200 of the rights from RRLC. On the strength of the Riverside <br />Irrigation District contract, the RRLC enlarged Sanborn Draw Reservoir to the present <br />capacity of approximately 64,000 acre-feet and changed its name to Riverside Reservoir. <br /> <br />PROJECT SERVICE AREA <br /> <br />. <br /> <br />The project site and project service area are shown on Figure 1. Approximately 22,500 <br />acres are served by the Riverside Irrigation District, and reservoir storage water is delivered <br />for supplemental irrigation supplies to about 25,000 acres of additional land located outside <br />the District. <br /> <br />NEED FOR THE PROJECT <br />. The RRLC is undertaking this project to enhance the safety of Riverside Dam and Reservoir <br />by providing an emergency spillway to allow the safe routing of the inflow design flood <br />without the overtopping of the dam embankment. The inflow design flood is that flood <br />produced by the 75% probable maximum precipitation. <br /> <br />Approximately 3,100 acres of the Riverside Reservoir and adjacent land is located on <br />Bureau of Land Management (BLM) land. The BLM has offered to sell this property to <br />RRLC. In order to maintain control of the reservoir and its facilities without possible future <br />interference from the federal government, RRLC desires to obtain this land from the BLM <br />as a part of this project. <br /> <br />. <br /> <br />Riverside Dam and Reservoir has been classified by the Colorado Division of Water Reso ~ <br />urces (DWR), Office of the State Engineer, Dam Safety Branch as a Large size, C1'lSS 1 <br /> <br />5 <br />