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001151 '1~t~, 14 Pilot Knob sites a~e included in the basin model but arc currently not operated. Inclusion of these sites in the data development was meant to facilitate inclusion of the sites in the model should operation of these reservoirs be chosen for further evaluation at a later date. Records from three gages on E1khead Creek were used to synthesize in(]ows at the three reservoir sites. Prior to making spatial adjustments to the reservoir sites, the gage records were extended to cover missing years using regression analysis and data recorded at the Maybell gage. The runoff per unit area method was then used to "move" the extended gage data to the site of the reservoir, along with corrections based on differences in average basin elevations. Fortification Creek A gage is located on Fortification Creek just upstream from the confluence with the Yampa River. This gage was extended using a regression equation with flows recorded at the Maybell gage, Although there are presently no feasible storage sites identified on Fortification Creek, this inflow has been developed separately from other reach gains to allow for specification, if desired, of a project on Fortification Creek in the future. Williams Fork River Several gages exist on the Williams Fork River and its two major tributaries, the South Fork and the East Fork. Inflows .were generated for two reservoirs on the Williams Fork River, The East Fork Reservoir site is located above the confluence with the South Fork near the town of Pagoda, Inflows were synthesized based on regres~ion of an upper East Fork gage against flow at the Steamboat gage. Once the East Fork gage records were extended, the flows were transposed to the site of the reservoir using the yield per unit area along with a correctio~ for changes in the average basin elevation. Inflows to the Williams Fork Reservoir site were generated by first moving flows at the East Fork site down to the confluence with the South Fork. "mis was accomplished with the ninoff per unit area method. After adding contributions from the South Fork, flows were again transposed to the Williams Fork site near Hamilton. South Fork flows were generated using extended gage records based on the Steamboat springs gage and transposing to the East Fork confluence with area and elevation corrections. Several years of gage data are available on the Williams Fork immediately above the confluence with the Yampa River. Flows estimated at the Williams Fork Reservoir site and transposed to the confluence were compared to this short gage record for validation. In general the comparison between synthetic and gaged flows is good. WATER RIGHTS Background The waters of the Colorado River Basin have been apportioned fo'r use between the upper and lower basin states by the Colorado River Compact of 1922. The upper basin allocation (among the 'states of Utah, Wyoming, Colorado, and New Mexico) has been further apportioned by the Upper Colorado River Basin Compact of 1948, This compact addresses the apportionment of water of the Yampa River between Colorado and Utah, stipulating that Colorado will not cause the Yampa River at the Maybell gaging station to be depleted below an aggregate of 5 million acre-feet (mat) for any period l ,-,.. ,-'. .~' ;~.~Eji