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Total 57,100 230,700 62,300 350,100 I I I I I I I I I I acre-feet per year. There are numerous other smaller transbasin diversions. The major transbasin diversions are itemized below. TRANSBASIN DIVERSION AVERAGE ANNUAL FLOW (acre-feet) 1973 - 1983 Moffat Tunnel Adams Tunnel Roberts Tunnel The total consumptive use above the Cameo gage (not including transbasin diversions) has been estimated using USBR C.R.S.S. data base data to be 712,500 acre-feet/yr during the period 1973 -1983. Most of this consumptive use is irrigstion wi th the remainder being municipal. In summary, the flow of the Colorado River above Cameo is only partially regulated. The long term natural (virgin) average annual flow is 3,007,000 acre-feet; of this 712,500 acre-feet (24%) is consumptively used, and about 350,000 acre-feet (12%) is exported. There is 1,048,220 acre-feet of maj or storage in the basin which is used to regulate flows on the west slope as well as flows to the transbasin diversions. III-2 I I I I I I I I II II 2. Project Area a. General The watershed which supplies the project ranges in eleva- tion from 5500 ft near the northern edge to as high as 11,000 ft in the Mamm Creek and Beaver Creek basins. The high altitude portions of the basins retain snow until June each year while the lower portions of the basins experience snowmelt during April and May. This spring snowmelt aspect of the watersheds is typical of the upper Colorado River Basin. The project area hydrology is exemplified by the flow at the gage on l{est Divide Creek near Raven. This gage, which is imme- diately above the project area, is representative of the flow from many of the project area tributaries. The monthly flow distribution is shown below: