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() II IJ (5 ;) 8 into the "Clinton Reservoir - Fraser River - Water Agreement" (Clinton Agreement) to further provide additional water supplies for Summit imd Grand C;ounties. One of the effects of this new agreement was the "downsizing" of the original Summit County Agreement, as will be discussed below. Although the agreement was not in effect during the CRDSS study period, it has a significant role in the future operations of the upper Blue River and upper Fraser River basins. As such, additional discussion of the Clinton Agreement is warranted. Pursuant to the Clinton Agreement, Denver agreed to "operate" its Dillon Reservoir and Roberts Tunnel water rights so as to allow Clinton Reservoir to store up to 3,650 acre-feet each year, during the period August 1 through July 31. Engineering studies indicated that the maximum fill of 3,650 acre-feet will produce a reliable, "firm" annual yield of about 1,200 acre-feet. This "Reservoir Yield" is tl1en-used to repay Denver for the consumptive use attributable to snowmaking at the ski areas and other beneficial uses, including augmentation. Denver will allow the Summit County Ski areas (Breckenridge, Keystone and Copper Mountain) to divert water for snowmaking and will correspondingly release water from Williams Fork Reservoir in amounts and at times required to augment the snowmaking diversions, bv exchanae. The amount of snowmaking diversions cannot exceed five times the amount of Reservoir Yield in Clinton Reservoir to which the ski areas are entitled. Denver reserved the right and claim to all return flows from snowmaking. The snowmaking consumptive use is estimated at 20% of the total diversion and is credited to Denver's account in Clinton Reservoir as the exchange occurs. The Agreement also provides water for snowmaking at the Winter Park Ski Area in Grand County under a similar repayment scheme. Here, Denver agreed to diversions by Winter Park from its Fraser River Collection System and Winter Park agreed to credit Denver's account in Clinton Reservoir in an amount equal to the consumptive use of snowmaking (20% of the snowmaking diversions). To the extent that return flows from snow!T1aking at Winter Park do not return above Denver's collection system, Winter Park is obligated to credit Denver's Clinton account at a rate of one acre-foot for each acre-foot which cannot be recaptured. Denver cannot exchange water from Williams Fork Reservoir to the Summit County Ski Areas at any time when the "Computed Natural Inflow" to Dillon Reservoir is less than 50 cfs. In years when Denver has water in the "1,000 Acre-Foot Pool" (see above), water in this pool can be released from Dillon Reservoir and used to supplement the Computed Natural Inflow and accordingly, allow upstream municipal diversions and exchanges for snowmaking to occur. If insufficient water is available in the pool, Denver will not make the exchanges. Sufficient water is considered to be available only to the extent that storage in the 1,000 Acre-Foot Pool exceeds the following minimum values: October 1 - January 31 February 1 - February, 28 March 1 - March 7 188 acre-feet 135 acre-feet 113 acre-feet Key to the Clinton Agreement were amendments to the Summit County Agreement such that: (1) The M & I consumptive use limitation in the latter was reduced from 1,750 acre-feet to 1,151.6 acre-feet and (2) The total diversion under the Summit County Agreement was reduced from 3,100 acre-feet to 1,217.8 acre-feet. This "downsizing" was accomplished by Breckenridge, Copper Mountain and Keystone agreeing to reduce their entitlements under the original agreement by 1,882.2 acre-feet. This downsizing left 1,168 acre-feet of consumptive use water available 0-12