DENVER & RIO GRANDE WESTERN ROUTE. 153 
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length, resting on a gravel foundation | in height, and the seventh is 60 feet 
and provided with seven steel roller | long and 15 feet 4 inches in height. 
crests for regulating the height of | During the period of low water, 
backwater. Six of these roller crests | when practically the entire flow of 
are 70 feet long and 10 feet 3 inches | river will be diverted, these roller 
