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3.8 flows for the Roaring Fork River at Glenwood Springs. Average water yield from the Roaring Fork watershed is 857,000 AF. Diversion by the Hunter Creek collec- tion system of the Fryingpan-Arkansas project averages 16,000 AF. Most of the potential uses for Ruedi Reservoir water are located in the Colorado River valley from Glenwood Springs to Grand Junction. The controlling senior water rights are diverted from the Colorado River in the Grand Junction area. The Ruedi Reservoir rights are relatively junior in comparison with these rights, therefore when the Fryingpan-Arkansas collection system is operating, a replacement release is required when a shortage of water occurs on the Colorado River. The average annual yield of the Colorado River basin above the Cameo gaging station from 1948 to 1983 is approximately 2,665,000 AF. Table 3.4 gives mean monthly flows for the Colorado River at the Cameo gaging station for wet, dry, and average years of record. Flows in the Colorado River are depleted by numerous transmountain diversions, including the city of Denver, the Colorado-Big Thompson Project, the Homestake Project, and the Fryingpan-Arkansas Project. Whenever the flow in the Colorado River is insufficient to meet the senior rights in the Grand Valley, a shortage of water is indicated. The Ruedi Reservoir storage rights and Fryingpan-Arkansas diversion rights are lower in priority (i.e., junior) to the Grand Valley rights, therefore when the diversion system is operating, a replacement release is required. All water rights decreed for irrigation and power, active or inactive, total about 2.98 million AF per year for the Grand Valley area (4,110 cfs). Over the years, some of these rights have been abandoned and others transferred as water delivery systems were combined and improved. The present maximum demand for irrigation and power under all active decrees is about 1.74 million AF per year (2,410 cfs). Review of the historic operation of Green Mountain Reservoir has shown that the flow at the Cameo gage has averaged 1.61 million AF per year (2,230 cfs) when a call for water from Green Mountain Reservoir has been imposed to meet natural flow shortages (Colorado River Accounting Sheets, unpublished, USBR). This flow has ranged from a low of 1.21 million AF per year (1,680 cfs) to a high of 1.94 million AF per year (2,680 cfs). For the operation studies of Ruedi Reservoir, it was assumed that a call for water from the reservoir for replacement purposes woul d occur whenever the fl ow at Cameo fel 1 bel ow 1.62 mi 11 i on AF per year (2, 240 cfs). Releases are made from Green Mountain Reservoir primarily for senior water rights associated with the Shoshone Power Plant and secondarily for the same ;