FLOOD10417

• County: Mineral
• Community: Mineral County
• Stream Name: Willow Creek
• Title: Willow Creek Channel Improvement, Mineral County, Colorado - Channel Replacement Feasibility Report
• Date: 8/13/2003
• Prepared For: Willow Creek Reclaimation Committee
• Prepared By: Chou Cha, P.E., Civil Engineer
• Floodplain - Doc Type: Flood Mitigation/Flood Warning/Watershed Restoration

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LIST OF FIGURES

Figure 1. Vicinity and local maps of the town of Creede, Colorado (Images from Rand
McNally Atlas and U.S.G.S. Quad Sheet) ...... ......................................................... .... 1
Figure 2. Typical existing channel cross-section looking downstream ..............................2
Figure 3. Maintenance grouting repair and deteriorating at and below water line ............3
Figure 4. Formed concrete texture (Image from www.increte.com) ................................. 6
Figure 5. Typical prefabricated pedestrian bridge (Image from
www.continentalbridge.com).....................................................................................11
Figure 6. Existing safety and rescue feature in channel consist of hanging tires ............ 12
Figure 7. Mean monthly flows for Willow Creek............................................................ 17

LIST OF TABLES

Table 1. Cost summary chart of design alternatives without appurtenances................... 10
Table 2. Cost summary chart of appurtenance structures ................................................ 12
Table 3. NRCS staff day chart required for producing final construction drawing......... 16
Table 4. A summary of total NRCS staff days for the project......................................... 17
Table 5. Monthly averaged climate data for Creede, Colorado (Source: Western Regional
Climate Center web site for Creede, Colorado (051939)) ......................................... 18
Table 6. Total cost summary chart of design alternatives with all appurtenances .......... 19
Table 7. Benefit/Cost Ratio Decision Matrix ................................................................... 20

ACKNOWLEDGEMENTS

The author would like to thank and gratefully acknowledge the support in reviewing this
report by the various individuals including John Andrews, Christine Campbell, Rodney
Clark, Steven Gamer, Steven Russell, and Larry Wilson.

NRCS Northern Plains Engineering Team II