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Show BOULDER DAM WILL BACK WATER 118 MILES UP RIVER The proposed 550-foot dam across the Colorado river at Black canyon, would back the flood waters of the Colorado river a distance of 118 miles. The board of engineers and geologists geolo-gists headed by Major General William Wil-liam L. Sibert and appointed under a resolution of congress last May, has recommended the construction of the proposed dam in Black canyon rather than in Boulder canyon. The favored dam site is twenty-one miles below the original Boulder dam site, 198 miles below the western boundary of Grand canyon national park and 257 miles below the Kaibab suspension bridge at. the foot of the Kaibab trail in the -park, these distances being along the bed of the Colorado river. The elevations of the river bed above sea level at these various points are approximately 2428 feet at the Kaibab Kai-bab bridge. 1779 feet at the western park boundary, 706 feet at the Boulder dam site and 647 feet at the Black canyon dam site. This makes a fall of some 1781 feet in the 267 miles between be-tween the Kaibab bridge and the Black canyon site, or an average of nearly seven feet to the mile. |