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6/25/96 ... 12:54 PM Camp Dresser £~ McKee Inc. TABLE 3.15 Colorado River Flow Reductions at the Top of the 15-Mile Reach Estimated Impacts to Critical Habitat Water Depths by Future Ute Water Diversions Replacement of the Plateau Creek Pipeline Habitat: Backwater Alternate Transect ID: Backwater No. 2 Mid-91 Transect: 8 (1991) Summer Au ust -October Winter November -March Current Future Net Change in Depth Due to Current Future Net Change in Depth Due to Conditions Conditions District Diversions Conditions Conditions District Diversions ft ft ft in ft ft ft in Statistics Maximum Habitat De th Maximum Habitat De th Minimum 0.00 0.00 0.00 0.00 3.91 3.89 (0.02) (0.28) Average 3.08 3.04 (0.04) (0.49) 4.57 4.55 (0.02) (0.21) Maximum 6.15 6.14 (0.02) (0.21) 5.44 5.43 (0.01) (0.14) USFWS Sukable % of Months Max Depth 2 Net Change % of Months Max Depth 2 Net Change De the Suitable De th Due to Ute Suitable De th Due to Ute Mean - S.E. 3.4 ft 47% 47% 0% 2.6 ft 100% 100% 0% Mean 4.0 ft 23% 21% -2% 2.9 ft 100% 100% 0% Mean + S.E. 4.5 ft 9% 7% -2% 3.1 ft 100% 100% 0% Notes: (1) Maximum water depths were computed on a monthly basis over the 1975-1993 study period using Colorado River streamflows at the top of the 15-mile reach and flow versus depth relationships established by the USFWS (Table 3 of May 1995 USFWS report Relationships Between Flow and Rare Fish Habitat in the '15-Mile Reach' of fhe Upper Colorado River. (2) Current conditions represent maximum depths in transect at Ute Water's current level of water use, adjusted for prior Section 7 consultations. (3) Future conditions represent maximum depths predicted after deducting Ute Water's additional diversions upstream of the 15-mile reach under future demands. (4) USFWS suitable depths from Table 2 of May 1995 report. (5) S.E. -standard error of estimate (equal to the standard deviation if data are normally distributed). HAB-BABB.XLS ... Summary