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Page No. S.12 Review of Flaming Gorge Model Developed for the Flaming Gorge Dam EIS ................................................................................................. S-18 S.13 Operational Description .................................................................................... S-19 S.13.1 Safe Operation of Flaming Gorge Dam ............................................... S-19 S.13.2 Reservoir Operations Process Under the No Action Alternative......... S-20 S.13.2.1 Operations in May Through July (Spring Period) ............... S-20 S.13.2.2 Use of Bypass Tubes and Spillway at Flaming Gorge Dam .......................................................................... S-21 S.13.2.3 Summer and Fall Operations (Early Base Flow Period)...... S-21 S.13.2.4 Winter Operations (Late Base Flow Period) ........................ S-22 S.13.3 Reservoir Operations Process Under the Action Alternative ............... S-22 S.13.3.1 Operations in May Through July (Spring Period) ............... S-23 S.13.3.2 Use of Bypass Tubes and Spillway at Flaming Gorge Dam .......................................................................... S-26 S.13.3.3 Operations in August Through February (Base Flow Period) .............................................................. S-26 S.13.3.4 Operations in March and April (Transition Period) ............. S-27 S.14 Environmental Consequences ........................................................................... S-28 S.14.1 Hydrology ............................................................................................ S-28 S.14.2 Water Quality, Water Temperature, and Sediment Transport ............. S-32 S.14.3 Hydropower ......................................................................................... S-32 S.14.4 Agriculture ........................................................................................... S-34 S.14.5 Land Use .............................................................................................. S-34 S.14.6 Ecological Resources ........................................................................... S-35 S.14.6.1 Threatened and Endangered Fish .................................. S-35 S.14.6.2 Other Threatened and Endangered Species ................... S-35 S.14.7 Cultural Resources ............................................................................ S-36 S.14.8 Paleontological Resources ................................................................ S-36 S.14.9 Indian Trust Assets ........................................................................... S-36 S.14.10 Safety and Public Health ................................................................... S-36 S.14.11 Air Quality ....................................................................................... S-37 S.14.12 Visual Resources .............................................................................. S-37 S.14.13 Environmental Justice ....................................................................... S-37 S.14.14 Recreation ....................................................................................... S-37 S.14.15 Socioeconomics/Regional Economics .............................................. S-37 S.15 Cumulative Impacts .......................................................................................... S-37 S.16 Uncertainties ..................................................................................................... S-38 5.16.1 Hydrology ............................................................................................ S-38 S.16.2 Operational Limitations for Temperature of Water Released From the Dam ....................................................................... S-39 S.16.3 Uncertainties Associated With Increased Spillway Use ...................... S-39 S.16.4 Fish Responses to Flow and Temperature Modifications .................... S-39 S.16.5 Uncertainties Associated With Flood Plain Inundation ....................... S-40 S.16.6 Riparian/Vegetation ............................................................................. S-41 S.17 Addressing Uncertainties Through Adaptive Management .............................. S-41 S.18 Environmental Commitments ........................................................................... S-42 A ? Operation of Flaming Gorge Dam Draft EIS