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the river between the Price-Stubb and GVIC Diversion Dams. This decrease is usually in the 100 <br />to 200 cfs range which would leave at least 440 cfs in this section of the river. Therefore, there <br />should be at least 100 cfs for future fish passageway operation nearly 100 percent of the time. <br />Grand Valley Project Diversion Dam <br />The water supply for this passageway structure is similar to that of the Price-Stubb Dam except <br />that this diversion dam is upstream from Plateau Creek. For the critical months of August, <br />v <br />September and October, the average monthly flow for Plateau Creek is 77.5 cfs for August, 91.1 <br />cfs for September, and 113 cfs for October. If Orchard Mesa check operation decreases water <br />supplies by 200 cfs and 113 cfs is supplied by Plateau Creek, there should be 327 cfs (640 cfs for <br />GVIC - 200 cfs checked - 113 from Plateau Creek) going over the Grand Valley Project <br />Diversion Dam in the month of October which is the worst case month. The Orchard Mesa <br />check normally operates in water supply years that are drier than average. Therefore, the water <br />being supplied by Plateau Creek will be less than average and more water would be passing over <br />the Grand Valley Project Diversion Dam. Considering all of these factors, it is reasonable to <br />believe that there would be enough water at this location. <br />In summary, there appears to be adequate water supply to facilitate fish passage at all three of the <br />diversion dams on the Colorado River in the Grand Valley. Once passage is reestablished at these <br />three dams the 15-Mile Reach will be reconnected to the upstream critical habitat which extends <br />to Rifle, Colorado. <br />B-6