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. , 18 TABLE 3 (Cont.) KAF HIGHEST YEAR 1957 EXISTING COND mONS PRESENT MODIFIED CHANGE ENVIRONMENTAL BASELINE CHANGE MUDDY CREEK PROJECT CHANGE HON --------------------------------------------------------------------------- JAN 80.4 11.9 98.3 -23.6 74.7 0.1 74.8 FEB 78.7 13.7 92.4 -22.3 70.1 0.1 70.2 HAR 81.8 13.1 94.9 -30.9 64.0 0.1 64.1 APR 101.2 -18.4 82.8 -24.0 58.8 -2.0 56.8 HAY 532.6 -99.3 433.3 -58.9 374.4 -8.1 366.3 JUNE 1420.3 -202.6 1217.7 -96.0 1121.8 -4.8 1117.0 JULY 1002.2 -137.7 B64.5 -67.0 797.5 -0.2 797.3 AUG 247.1 -31.0 216.7 -18.4 19B.3 3.0 201.3 SEPT 14.3 -11.6 62.7 -3.1 59.6 -1.1 58.5 OCT 72.4 4.3 76.7 -B.9 67.7 0.4 68.1 NOV 128.8 11.6 140.5 -16.6 123.9 0.4 124.3 OEC 108.0 15.0 123.0 -15.3 107.6 0.4 10B.0 TOT 3928.4 -425. 1 3503.4 -385.0 3118.4 -11.7 3106.7 Project I~acts The Muddy Creek project will cause discrete, identifiable, additive impacts to the Colorado River endangered fishes. As shown in the flow analysis, the Muddy Creek project wi 11 cause addi t i ona 1 flow dep let ions of exi st i ng and planned water projects and additional changes in historic flow regimes produced as a result of other water projects. These projects reduce peak runoff flows in April, May, and June and release additional flows during other times of the year. The fact that tile ItIdd1 Creek. proj ect depletes f1 ows duri ng peak. runoff peri ods is of concern to the Service because this period is of great significance geomorphically and ecologically. This is the most dynamic period in the cycle, and it precedes the very critical spawning period of the endangered fishes. Observations clearly dmmstrate that the spawning activities of these fishes are synChronized with ind are undoubtedly influenced by the runoff period (Archer et al. 1986: Archer and Tyus 1984>' The Service believes that peak. spring flows art very ~ortant for maintaining channel geomorphology, providing access to off~l ~itats, and preserving suitable spawning substrates.