7886

• UCREFRP Catalog Number: 7886
• Author: Hydrosphere Resource Consultants.
• Title: Yampa River Basin Recommended Alternative, Detailed Feasibility Study
• USFW Year: 1995.
• USFW - Doc Type: Final Report.
• Copyright Material: NO

LIST OF FIGURES
Figure S-1 Modeled Flows at Maybell ............................................................. S-4
Figure S-2 Site Map of Dam and Spillway ........................................................ S-8
Figure 1-1 Upper Yampa River Basin ............................................................. 1-4
Figure 2-1 End-of-Month Reservoir Contents (Current Potential Demands) .............. 2-13
Figure 2-2 End-of-Month Reservoir Contents (2040 Without Project) ..................... 2-17
Figure 2-3 End-of-Month Reservoir Contents (2040 With Project) ......................... 2-21
Figure 2-4 Modeled Average Monthly Elkhead Creek Flows
Below Elkhead Reservoir ............................................................... 2-23
Figure 3-1 Upper Yampa River Basin ............................................................ . 3-2
Figure 3-2 Property Ownership Map .............................................................. . 3-5
Figure 3-3 Elkhead Reservoir Area - Capacity Curve ......................................... . 3-9
Figure 3-4 Seasonal Pattern of Monthly Inflows ................................................ 3-12
Figure 3-5 Elkhead Reservoir Drainage Area ................................................... 3-14
Figure 4-1 Site Map of Dam and Spillway ....................................................... . 4-3
Figure 4-2 Embankment Cross-Section ........................................................... . 4-5
Figure 4-3 Primary Outlet Plan and Profile ...................................................... . 4-7
Figure 4-4 Spillway Plan ............................................................................ . 4-9
Figure 4-5 Spillway Profile ......................................................................... 4-10
Figure 4-6 PMF Hydrographs ...................................................................... 4-11
Figure 4-7 Stilling Basin ............................................................................. 4-14
Figure 4-8 Emergency Spillway Section .......................................................... 4-16
Figure 4-9 Flow-Duration Curve ................................................................... 4-18
Figure 5-1 National Environmental Policy Act Process Flowchart .......................... . 5-3
Figure 5-2 Reservoir Impact Map ................................................................. . 5-7
Figure 5-3 Detailed Near-Term Project Development Schedule ............................. 5-11
Figure 6-1 Upper Yampa River Basin ............................................................ . 6-2
Figure 6-2 Elkhead Reservoir Vicinity Map ..................................................... . 6-6
Figure 6-3 USGS Stream Gages in the Elkhead Creek Basin ................................. 6-15
Figure 6-4 Modeled Average Inflow to Elkhead Reservoir ................................... 6-16
Figure 6-5 Elkhead Reservoir Contents Current Potential Conditions ...................... 6-20
Figure 6-6 Elkhead Reservoir Contents - 2040 Demand Conditions Without Project ... 6-24
Figure 6-7 Elkhead Reservoir Contents - 2040 Demand Conditions With Project ...... 6-29
Figure 6-8 Modeled Average Monthly Elkhead Creek Flows
Below Elkhead Reservoir .............................................................. 6-31
Figure 6-9 Modeled Average Monthly Yampa River Flows Above Elkhead Creek ..... 6-34
Figure 6-10 Modeled Average Monthly Yampa River Flows Below Elkhead Creek...... 6-35
Figure 6-11 Typical Elkhead Reservoir Views .................................................... 6-44
Figure 6-12 Vegetation Surrounding Elkhead Reservoir ........................................ 6-47
Figure 6-13 Reservoir Impact Map ................................................................. 6-61
IV