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Colorado Water Conservancy District. To placate West Slope interests concerned about losing so much water, the Conservancy Act included a clause stipulating that transbasin diversions would not impair the prospective use or cost of water on the West Slope. To meet this requirement, the Colorado-Big Thompson Project included construction of the 150,000 acre-feet Green Mountain Reservoir on the west side of the Divide to provide replacement water in the Colorado Basin. Private interests were diverting water across the Divide as well. There were three such major projects in the 1930's. The Twin Lakes Tunnel was financed by the Reconstruction Finance Corporation to divert nearly 52,000 acre-feet of water out of the Colorado Basin and into the Arkansas River system. And the Denver Water Board developed two transmountain diversions to bring water from the Colorado Basin to the Front Range for municipal use. The pioneer bore of the Moffat Tunnel was constructed by the Denver and Salt Lake Railroad in 1929. It was leased to the Denver Water Board in 1938 when construction was complete and brought 81.5 million acre-feet of water annually to the Denver area. The Jones Pass Tunnel diverted water from the Williams Fork of the Colorado River to Clear Creek, where 10,000 acre--feet of water entered the Denver water system. The tunnel was completed in 1940 (Foss, 1978). The last big transmountain diversion by the Denver Water Board was the Roberts Tunnel Collection System, completed in 1963. This project approximately doubled the Denver Water Board's storage capacity. Water is diverted from the Blue River drainages on the western slope of the Divide, stored in Dillon Reservoir with its 254,000 acre-feet capacity and moved via the 23-mile Roberts Tunnel to the North Fork of the South Platte River (Foss, 1978). In 1978, the Colorado River Water Conservation District estimated that transmountain diversions took almost 635,000 acre-feet of water out of the Colorado River system. Postwar Deve1o~t: 1940-1987. Mining, despite its frequent boom and bust cycles, and agriculture have continued to playa large role in Colorado's economy, although currently both industries are in decline. In 1930, farming and mining accounted for 32 percent of the total employment in Colorado, and government, trade and services accounted for 40 percent. By 1962, those numbers had changed to 9 percent and 60 percent, respectively (Abbott, 1976). During those years, Colorado made the jump from an extractive economy to a service economy without going through the intermediate stage of heavy industrialization (Abbott, 1976). Employment in manufacturing, for example, only rose from 9 percent of the total work force to 14 percent during that time. The transition to a service economy was initiated by World War II and by the fact that Colorado was able to attract a sizable federal work force to the State. During the war years, the federal government built Lowry Field, Fitzsimons Army Medical Center, Fort Carson and Peterson Field into major military installations. Military payrolls climbed from $3 million to $152 million within the space of a few years, and represented 12 percent of all personal income in the State (Abbott, 1976). The Rocky Mountain Arsenal was opened to make chemicals and ordinance for the war effort and employed 14,000 people. The land housing the current Federal Center in Denver was bought in 1940 to allow the Remington Arms Company to manufacture small - 7 -