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<br />Again, since the values are mean monthly, there probably are periods during these months that <br />daily flows exceed 12,000 cfs. In recorded history, flows in April do not exceed the 12,000 cfs <br />flow rate by a large margin. Table 2 summarizes the increased access to historic habitat which <br />would have been provided by the construction of the fish passage structure. As discussed above, <br />possible flow enhancement options will increase the percentage oftime minimum passage flows <br />are available. <br /> <br />Table B-2 - Passage with and without a fish passage structure <br />using data for the period 1930 - 1986 <br /> <br /> Percent of time passage would <br />Month have been possible historically <br />April 0% <br />May 18% <br />June 37% <br />July 5% <br />August 0% <br />September 0% <br />October 0% <br />November 0% <br /> <br />Percentage oftime passage would have been <br />possible if there had been a fish ladder without any <br />flow enhancements <br /> <br />100% <br /> <br />100% <br /> <br />100% <br /> <br />93% <br /> <br />64% <br /> <br />35% <br /> <br />67% <br /> <br />100% <br /> <br />Water Supply for Upstream Fish Passage Structures <br /> <br />The potential design for the fish passageways at the abandoned Price-Stubb Dam, located 3 miles <br />upstream from the GVIC Diversion Dam, and for the Grand Valley Project Diversion Dam, <br />located 8.5 miles upstream from the GVIC Diversion Dam, would require passageway flows <br />similar to the requirement for the GVIC Diversion Dam passage (see frontispiece map): These <br />dams are considered complete barriers to fish movement at all flows, <br /> <br />Price-Stubb Dam <br /> <br />The Price-Stubb Dam is an abandoned facility previously used by the Mesa County and Palisade <br />Irrigation Districts. Under most water supply conditions, flows in the section ofriver between the. <br />Price-Stubb Dam and the GVIC Diversion Dam should be adequate to supply the 640 cfs GVIC <br />Diversion Dam requirement. A portion of the water supply for the GVIC can be provided <br />through the operation of the Orchard Mesa check. Thiswater decreases the flow requirement in <br /> <br />B-5 <br />