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BOULDER DAM Upstream Face & Towers Old Postcard ArizonaUSA Vintage Colour Postcard. BOULDER DAM, Upstream Face and Intake Towers from Arizona Side. Panorama. / The waters of the Colorado River which form Lake Mead, have been impounded behind Boulder Dam until now only 120 feet of the sheer 600-foot upstream face is above the water surface. When the water nears the crest it will flow off through spillways which drain into huge 50-foot tunnels around the dam and back into the river downstream.Publisher: Boulder Dam Service Bureau C.T. Art-Colourtone
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