DENVER & BIO GRANDE WESTERN ROUTE. 



153 



length, resting on a gi-avel foundation 

 and provided with seven steel roller 

 crests for regulating the height of 

 backwater. Six of these roller crests 

 are 70 feet long and 10 feet 3 inches 



in height, and the seventh is 60 feet 

 long and 15 feet 4 inches in height. 



During the period of low water, 

 when practically the entire flow of the 

 river will be diverted, these roller 



