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Show j* J._ rt IBli ^•: fe* m ; V *-; i THE DUCHESNE TUNNEL 90. ( Upper left) Downstream portal of the Duchesne tunnel as it appeared in September, 1941. The dump car tracks are on the floor of an excavated channel extending approximately 700 feet from the tunnel portal to the Upper Provo River channel. 91. ( Upper right) Site of the Duchesne tunnel, on the Mirror Lake road, before construction. 92. ( Center) Interior of the tunnel. 93. ( Lower right) The Upper Provo River, at the point where the excavation channel will meet the river. 94. ( Lower left) A view downstream of the excavation channel. 91, 92 Bureau of Reclamation 90, 9~>, 94 Hampton C. Godbe '" -....! • |