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<br />O PI -, .5 .', 3 <br />1u1 D <br /> <br />Land and Facility Resources <br /> <br />12 <br /> <br />'g 10 <br />o <br />(J <br />CD <br />1Il <br />~8 <br />CD <br />~ <br />~ <br />"g 6 . <br />CD <br />> <br />Q; I <br />"~ 4 <br />a: <br /> <br />1\ <br />\ <br /> <br />~ <br /> <br />\, <br /> <br />II!I <br /> <br />~ <br /> <br />I. / <br />V ^ .:--~ <br />\ 14>.. 11M ^ '\J~~ <br />-- J .. 1( "'-J " ~ ./".. <br />--/ I Si~h()n b~/ <br />I 3.600 ft <br /> <br />upstream <br />I <br />, <br /> <br />Dam <br /> <br />2 <br />-2,000 <br /> <br />o <br /> <br />2,000 4,000 6,000 <br />Distance upstream from dam (feet) <br /> <br />8,000 <br /> <br />_ with dam removed _ with dam retained <br /> <br />I <br /> <br />Figure 6 - River velocity at 10,500 cfs <br /> <br />Railroad and Landslide Stability <br /> <br />Approximately 1,000 feet upstream of the Price-Stubb Diversion Dam, on the west side of the <br />Colorado River, is a historically active landslide. This landslide is a small portion of a very large <br />inactive landslide mass that extends upriver ItA miles to the Cameo Power Plant and about 1 <br />mile west to Mt. Lincoln. The active portion of the landslide lies between the Colorado River <br />and the steep sandstone cliffs forming the west canyon wall (see Figure 7). Railroad tracks, <br />owned by the Union Pacific Railroad, are between the Colorado River and the over-steepened <br />slopes of the landslide. The railroad grade cuts through the toe of the landslide. <br /> <br />Issue: The fish passage alternatives could affect the stability of an existing landslide and <br />railroad. <br /> <br />Existing Conditions: The landslide in question is called the Tunnel No.3 Landslide <br />and is inspected annually as part of Reclamation's Upper Colorado Regional Landslide <br />Surveillance Program. Since 1988, annual inspections have revealed no visible evidence of <br />movement; however, the slide has been active in the past. In February and March 1950, this slide <br />became active and collapsed part of Tunnel No, 3 through which water for the Government <br />Highline Canal flows. Damage was so extensive that the tunnel had to be rerouted further into <br />the hillside in sandstone bedrock. The slide disrupted railroad traffic as well, and the track <br />alignments had to be reestablished (Murdock, 1950). <br /> <br />31 <br />