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PHYSICAL INFORMATION <br />Vidler Tunnel originates in Water Division 5 District 36 in Summit County and terminates in <br />Water Division 1 District 7 in Clear Creek County. <br />In 1968, construction of Vidler Tunnel was comple ted. Water first flowed through the tunnel in <br />1969. In 1970, construction of the expanded Vidl er Collection System was completed. The <br />collection system and tunnel were historically used to provide irrigation water to the Eastern <br />Slope. In December 2000, the City of Golden purchased Vidler Tunnel and the Vidler <br />Collection System from Vidler Tunnel Water Company. <br />The Vidler Collection System diverts water from the headwaters of the Blue River at six <br />locations. The Collection System is constructed of approximately 4,700 feet of pipeline. Water <br />collected in the Collection System is discharged into the tunnel where it is measured at a <br />concrete Parshall flume with an automatic reco rding device. Water fl ows by gravity through the <br />tunnel to the headwaters of Clear Creek on the Eastern Slope. At the Eastern portal there is a <br />second flume to measure the discharge of water from the tunnel. <br />Length: <br /> Approximately 1.4 miles (not including collection system) <br />Capacity: <br />At least 17.0 cfs (17.0 cfs is the maximu m daily diversion recorded through the <br />tunnel on June 11, 1991.) <br />Diversion Measurement Device: <br /> Tunnel Inlet: <br />DWR WDID: 3604626 <br />USGS ID: 09047300 – Vidler Tunnel at Argentine Pass, CO <br />Inlet Datum: 11,780 feet above sea level NGVD29 <br />Tunnel Outlet: 3 foot Parshall flume equipped with an A-35 Stephens recorder and a <br />continuously monitoring sa tellite linked system. <br />Outlet Datum: 11,700 feet above sea level NGVD29 <br />Conveyance Efficiency: <br />The first approximate 810 feet of th e tunnel is inset with a 36-inch <br />diameter pipe. The remainder of the tunnel is excavated through hard rock. There is no <br />concrete lining in the tunnel. <br />HydroBase Data: <br />Diversions are reported as continuously monitored st reamflow records and as <br />administrative records by Colorado DWR. C ontinuously monitored streamflow data for <br />Station 09047300 are available for daily a nd monthly diversions from 1971 through <br />2002. Administrative data recorded as Structure 3604626 are avai lable for daily and <br />monthly diversions from 1975 through 2002. Both continuously monitored streamflow <br />records and administrative diversion records are available on a daily and monthly basis <br />through Colorado DWR HydroBase. In additi on, monthly diversions are available from <br />the January 23, 2001 W.W. Wheeler and Associat es letter to Glenn Porzak from 1969 <br />VidlerTunnel.doc 4 of 10 <br />