OCR

The 56-foot diversion tunnels, totaling 15,946 feet in length, required the removal of 1, 500, 000 cubic yards of rock. Mucking was done with 100-ton electric shovels with 3 1/2 cubic-yard buckets and 10-ton trucks. A four-level, truck-mounted drill carriage carried a total of 30 drills and drilled one-half of the bench in one operation. Wing sections on either side of top heading were drilled from two vertical bars. Diversion tunnels were excavated by first driving a 12-foot by 12-foot pioneer heading, which was then enlarged to the full 56-foot width but only 41 feet high, leaving 15 feet of invert for later excavation. The rock proved to be of excellent quality and no support was required at any point. Concrete lining was installed by means of a huge structural steel jumbo supporting the 1/4 inch steel plate wall forms. Lining averages 36 inches in thickness, with a minimum of 24 inches. An asphalt oil coating applied with compressed air was used for curing the side walls. The roof or arch section of the concrete lining, comprising 110 degrees of the circumference, was installed last. In addition to a jumbo supporting the 80-foot length of form, equipment included a separate gun carriage with two 2-cubic-yard pneumatic concrete guns and hoisting equipment, and separate traveler to support two placement pipes . Cooney Dam - Located on Red Lodge Creek near the city of Boyd, Montana, this project was completed in 1936. It is an earthfill dam with a structural height of 97 feet and a crest length of 2,260 feet. The reservoir name is Cooney also and has a capacity of 27,515 acre -feet. The project was constructed for irrigation. The owner is the Montana Water Conservation Board and the dam was engineered by them also. Approximate cost of this project was $478,000. Pine View Dam - Located on the Ogden River near Ogden, Utah, this project was completed in 1937. It is an earthfill type darn with a structural height of 132 feet and a crest length of 600 feet. The volume content of the dam is 418, 000 cubic yards. The reservoir's name is Pine View also and has a capacity of 110,150 acre-feet. The dam was built between the years 1934-1937 by Utah and Morrison- Knudsen Co., Inc. for the Bureau of Reclamation to irrigate 22, 000 acres of land and furnish municipal water and power to the city of Ogden, seven miles to the west. Approximate cost of the project was $1,466,000. The Moffat Water Tunnel Englargement in Colorado for Denver Municipal Water Works in the amount of $1,144,000. The Moffat Project Diversion Tunnel in Colorado for Denver Municipal Water Works in the amount of $445,000.