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CONTENTS (continued) <br />2.11.3 Wildlife Habitat and Other Measures <br />2.11.4 Fall Back Provisions 2 -47 <br />2.12 ALTERNATIVES CONSIDERED BUT ELIMINATED FROM FURTHER 2 -47 <br />CONSIDERATION <br />2.13 ECONOMIC ANALYSIS 2 -48 <br />2 -49 <br />3. AFFECTED ENVIRONMENT <br />3 -1 <br />3.1 REGIONAL SETTING <br />3.2 WATER RESOURCES DEVELOPMENT AND EXISTING WATER USE <br />3.2.1 Upstream Water Resources Development <br />3 -2 <br />3.2.2 Existing Water Use and Allocation <br />3 -2 <br />3.3 WATER QUANTITY AND QUALITY <br />3 -4 <br />3.3.1 Surface Water <br />3 -5 <br />3.3.2 Groundwater <br />3 -5 <br />3.4 CHANNEL MORPHOLOGY <br />3 -16 <br />3.4.1 Channel Narrowing History <br />3 -18 <br />3.4.2 Channel Narrowing Processes <br />3 -22 <br />3.5 AQUATIC RESOURCES <br />3 -26 <br />3.5.1 North Platte River <br />3 -32 <br />3.5.2 Platte River <br />3 -32 <br />3.5.3 Project Reservoirs and Canals <br />3 -33 <br />3.5.4 Threatened and Endangered Species <br />3 -35 <br />3.6 WILDLIFE AND BOTANICAL RESOURCES <br />3 -41 <br />3.6.1 Vegetation and Wetlands <br />3 -43 <br />3.6.2 Wildlife Resources <br />3 -44 <br />3.6.3 Threatened and Endangered Species <br />3 -49 <br />3.7 AGRICULTURE AND OTHER LAND USES <br />3 -56 <br />3.7.1 Irrigated Agriculture <br />3 -65 <br />3.7.2 Shorelines and Riparian Zones <br />3 -65 <br />3.7.3 Comprehensive Plans <br />3 -69 <br />3.8 RECREATION <br />3 -70 <br />3.8.1 Recreation Overview <br />3 -72 <br />3.8.2 Lake McConaughy <br />3 -72 <br />3.8.3 The Central Supply Canal <br />3-73 <br />3.8.4 Platte River <br />3 -83 <br />3.9 CULTURAL RESOURCES <br />3 -84 <br />3 -86 <br />iv <br />