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001171 34 Elk River North Fork to Rock Creek Rock Creek to Yampa River. 65 cfs 80 cIS Willow Creek Steamboat Lake LO Beaver Creek Beaver Creek to Elk River 7 cis 10 cfs nop personnel have indicated that Steamboat Lake is operated with some winter drawdown in order to accommodate spring run-off, but could not provide specific target levels to facilitate modeling of this operation. Accordingly, Steamboat Lake is operated in the model on a fill-and-spill basis. Elkhead Reservoir Elkhead Reservoir currently has two contracts for storage. Colorado Ute has a contract for 8,:110 af for use as a back-up cooling supply for (he Craig power generating facility. The remaining 5,390 af is committed to the Colorado Division of Wildlife for recreational purposes. The CDOW ownership is in the process of being purchased by the City of Craig. It was assumed for purposes of this study that this transfer of ownership will be completed and that this storage will be available to meet certain downstream demands. For' modeling purposes the minimum pool was defined as the volume of the reservoir below the reservoir outlet works at elevation 6240.5 feel. Below this elevation water is inaccessible except by pumping. This constraint is aS5umed to reduce the CDOW jCraig ownership to 1668 af. The resulting allocation of active and inactive storage is as follows: Minimum Pool Municipal and Industrial Colorado Ute :>,722 af 1,668 af 8,:> 10 af Total Capacity 1:>,700 af There are no instream flow filings on Elkhead Creek below the reservoir and no known minimum release requirements from the reservoir: In addition. there is no indication that Elkhead is operated to avoid or reduce spring and summer spills through winter drawdowns. The outlet capacity through Elkhead Dam is 165 cfs and there are no power generating facilities. Several model runs includ~ the operation of an enlarged Elkhead Reservoir. This enlargement is modeled in the Yampa River Basin Model by simply adding another target arc in the reservoir with the capacity of the enlargelT'.ent increment: For example, in Scenario 3 of the series of model runs, Elkhead is operated with an enlarged capacity of 52,000 ar and fourth storage target arc with a capacity of 38,300 af was added. In addition, the outlet works capacity was increased from the existing 165 cfs to 250 cfs. Protocol for Access to Storage Supplies As currently modeled, M&I demands at Craig have access only to 5,390 af or Elkhead Reservoir storage (existing size). M&1 demondsat Hayden and Steamboat have access to 4.000 af from Stagecoach Reservoir. M&! demands at Steamboat and Hayden may also access the 4,000 af mixed use pool at Stagecoach Reservoir if the M&I pool is empty I 'I dk.~