FLOOD10929

• County: Mineral
• Community: Creede
• Stream Name: Upper Willow Creek
• Basin: Rio Grande
• Title: Upper Willow Creek Watershed - FLood Control and Stream Stability Study
• Date: 10/1/2002
• Prepared For: Willow Creek Reclaimation Committee
• Prepared By: Agro Engineering
• Floodplain - Doc Type: Floodplain Report/Masterplan

Section 3 - Alternate Mitigation Strategies .............................................................................3-1

3 . 1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-1

3 . 2 Windy Gul ch CuI v ert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3 - 3

3.2.1 Option 1: Protection of 57cfs Flood.....................................................................3-4
3.2.2 Option 2: Protection of 239cfs Flood...................................................................3-5
3.3 Mining Museum Area Flood Protection ......................................................................3-8
3.3.1 Option 1: Widening of XS 14 Weir ......................................................................3-9
3.3.2 Option 2: Stream Restoration from Flume to XS15 .........................................3-10

3. 4 North Creede Culvert................................................................................................. 3 -16

3.5 Commodore Mine Flood Bypass System ..................................................................3-21
3.5.1 Option 1: Extension of Existing Pipe System...................................................3-22
3.5.2 Option 2: New flood Conveyance System over Commodore........................... 3-24
3.5.3 Option 3: Micro-hydro Power Generation........................................................3-27
3.6 Commodore Mine Debris Protection......................................................................... 3 - 29
3.7 Amethyst Mine Debris Protection............................................................................. 3 - 31

3 . 8 Tim be r Deb ri s ............................................................................................................ 3 - 3 3

3.9 Timber Debris below Commodore Mine ...................................................................3-35
3.10 Bank Protection below West Willow Bridge............................................................. 3 - 37

3.11 Channel Improvements.............................................................................................. 3 - 38

3.12 Sediment Source Controls.......................................................................................... 3 -40

Section 4 - Project Prioritization and Implementation.......................................................... 4-1
4.1 Prioritization of Mitigation Strategies......................................................................... 4-1
4.2 Potential Implementation Partners and Funding Sources ............................................4-4

4.3 Project Implementation................................................................................................ 4-8

Commodore Mine Flood Bypass System............................................................................ 4-8
North Creede Culvert Replacement..................................................................................... 4-9

Windy Gulch Flood Control................................................................................................ 4-9

Amethyst Mine Debris Protection....................................................................................... 4-9
Restoration of Mining Museum Area Reach..................................................................... 4-10

Removal of Timber Debris................................................................................................ 4-10

Channel Improvements - Willow / V ortex Weir Drops..................................................... 4-10

Sediment Source Controls.................................................................................................. 4-11

Willow Creek Bridge Bank Protection.............................................................................. 4-11

REFERENCES: ............................................................................................................................. I

AP PEND IX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I I