Engineering Wonders of the World
Volume I

94 ENGINEERING WONDERS OF THE WORLD. DAM AT TWIN FALLS, IDAHO. to supply water to large areas. On several of the large structures the work goes forward night and day, and the rate of progress is strikingly at variance with that at which Government work usually proceeds. The mag- nitude of the works and the remoteness of many of them from transportation have offered problems calling for the highest skill and intelligence on the part of the engineers in charge. Several of the larger structures are being erected in localities heretofore regarded as inaccessible, necessitating the building of hundreds of miles of expensive roads, over which the heavy machinery and materials have been transported. The engineers have established towns near these large works, with modern waterworks, stores, churches, schools, and hospitals. They have built power plants to generate electricity for lighting and for use in constructing the masonry dams. A cement mill has been operated by them for three years to supply the cement on one of the great works in the south-west. Sawmills under their charge have cut millions of feet of lumber from the Government reserves for buildings and fuel, and large areas have been cultivated and irrigated by them to produce CONCRETE AQUEDUCT OF PECOS IRRIGATION COMPANY, CARLSBAD, NEW MEXICO. food for the camps and forage for live stock. Several of the structures are of a magnitude which places them in th© front rank among the greatest engineering feats in the world.