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Lewis County Flood Insurance Study

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Lewis County Flood Insurance Study LEWIS COUNTY, WASHINGTON AND INCORPORATED AREAS Community Community Name Number LEWIS COUNTY, UNINCORPORATED AREAS 530102 CENTRALIA, CITY OF 530103 CHEHALIS, CITY OF 530104 MORTON, CITY OF 530105 MOSSYROCK, CITY OF 530253 NAPAVINE, CITY OF 530254 PE ELL, TOWN OF 530296 TOLEDO, CITY OF 530303 VADER, CITY OF 530266 WINLOCK, CITY OF 530306 Federal Emergency Management Agency FLOOD INSURANCE STUDY NUMBER 530102V001A NOTICE TO FLOOD INSURANCE STUDY USERS Communities participating in the National Flood Insurance Program have established repositories of flood hazard data for floodplain management and flood insurance purposes. This Flood Insurance Study (FIS) may not contain all data available within the repository. It is advisable to contact the community repository for any additional data. Selected Flood Insurance Rate Map panels for the community contain information that was previously shown separately on the corresponding Flood Boundary and Floodway Map panels (e.g., floodways, cross sections). In addition, former flood hazard zone designations have been changed as follows: Old Zone New Zone A1 through A30 AE B X C X The Federal Emergency Management Agency (FEMA) may revise and republish part or all of this FIS report at any time. In addition, FEMA may revise part of this FIS report by the Letter of Map Revision process, which does not involve republication or redistribution of the FIS report. Therefore, users should consult with community officials and check the Community Map Repository to obtain the most current FIS report components. Initial Countywide FIS Effective Date: VOLUME I TABLE OF CONTENTS 1.0 INTRODUCTION .............................................................................................................................................. 1 1.1 Purpose of Study .................................................................................................................................... 1 1.2 Authority and Acknowledgments ........................................................................................................... 1 1.3 Coordination .......................................................................................................................................... 9 2.0 AREA STUDIED .............................................................................................................................................. 13 2.1 Scope of Study ..................................................................................................................................... 13 2.2 Community Description ....................................................................................................................... 17 2.3 Principal Flood Problems ..................................................................................................................... 23 2.4 Flood Protection Measures .................................................................................................................. 27 3.0 ENGINEERING METHODS .......................................................................................................................... 28 3.1 Hydrologic Analyses ............................................................................................................................ 29 3.2 Hydraulic Analyses .............................................................................................................................. 33 3.3 Vertical Datum ..................................................................................................................................... 44 4.0 FLOODPLAIN MANAGEMENT APPLICATIONS ................................................................................... 46 4.1 Floodplain Boundaries ......................................................................................................................... 46 4.2 Floodways ............................................................................................................................................ 48 5.0 INSURANCE APPLICATION ..................................................................................................................... 106 6.0 FLOOD INSURANCE RATE MAP ............................................................................................................. 107 7.0 OTHER STUDIES ......................................................................................................................................... 109 8.0 LOCATION OF DATA ................................................................................................................................. 109 9.0 BIBLIOGRAPHY AND REFERENCES ..................................................................................................... 109 FIGURES Figure 1. Floodway Schematic .......................................................................................................................... 49 TABLES Table 1. Summary of Flooding Sources Presented in Current Study .................................................................. 2 Table 2. Streams Studied by Approximate Methods ........................................................................................... 5 Table 3. Historical CCO Meeting Dates ........................................................................................................... 13 Table 4. Streams Studied by Detailed Methods ................................................................................................ 14 Table 5. Stream Name Changes ........................................................................................................................ 16 Table 6. Recent Flood Events ........................................................................................................................... 25 Table 7. Historic Peak Discharges, Cowlitz River at Packwood ....................................................................... 26 Table 8. Historic Peak Discharges, Cowlitz River near Randle ........................................................................ 26 Table 9. Historic Peak Discharges, Cispus River .............................................................................................. 27 Table 10. Historic Peak Discharges, Tilton River ............................................................................................. 27 Table 11. Scaling Factors Used to Relate Flood Frequency Events .................................................................. 30 Table 12. USGS Stream Gages Used in Lewis County Analyses ..................................................................... 31 i TABLE OF CONTENTS (cont.) TABLES (cont) Table 13. Summary of Discharges .................................................................................................................... 34 Table 14. Manning‟s “n” Values ...................................................................................................................... 43 Table 15. Stream by Stream Datum Conversion Factors .................................................................................. 45 Table 16. Floodway Data .................................................................................................................................. 50 Table 17. Flood Insurance Zones Within Each Community ........................................................................... 107 Table 18. Community Map History Table ...................................................................................................... 108 VOLUME II Exhibit 1 – Flood Profiles Berwick Creek Panels 01P-03P Big Creek Panels 4P-13P Chehalis River Panels 14P-33P China Creek Panels 34P-40P Cispus River Panels 41P-44P Coal Creek Panels 45P-48P Coffee Creek Panels 49P Cowlitz River Panels 50P-69P Dillenbaugh Creek Panels 70P Elk Creek Panels 71P-73P Hall Creek Panels 74P-76P Hanaford Creek Panels 77P-79P Lacamas Creek Panels 80P-91P Lake Creek (Tributary to Tilton River) Panels 92P-93P Lincoln Creek Panels 94P-96P McMurphy Creek Panels 97P-98P Middle Fork Newaukum Creek Panels 99P Mineral Creek Panels 100P-104P Newaukum River Panels 105P-109P Newaukum River Overflow Panels 110P-111P No Name Creek (Tributary to Siler Creek) Panels 112P North Fork Newaukum River Panels 113P-116P Olequa Creek Panels 117P-125P Roundtop Creek Panels 126P Salzer Creek Panels 127P-129P Salzer Creek Middle Fork Panels 130P Salzer Creek North Fork Panels 131P Salzer Creek South Fork Panels 132P-135P Scheuber Bypass Panels 136P-137P Siler Creek Panels 138P-140P ii TABLE OF CONTENTS (cont.) Exhibit 1 – Flood Profiles Silver Creek Panels 141P-142P Skookumchuck River Panels 143P-145P South Fork Chehalis River Panels 146P-148P South Fork Newaukum River Panels 149P-153P South Fork Tilton River Panels 154P-155P Stearns Creek Panels 156P-157P Stowe Creek Panels 158P-159P Surrey Creek Panels 160P-161P Tilton River Panels 162P-171P Exhibit 2 – Flood Insurance Rate Map Index Flood Insurance Rate Map iii FLOOD INSURANCE STUDY LEWIS COUNTY, WASHINGTON AND INCORPORATED AREAS 1.0 INTRODUCTION 1.1 Purpose of Study This Flood Insurance Study (FIS) revises and updates information on the existence and severity of flood hazards in the geographic area of Lewis County, Washington, including the Cities of Centralia, Chehalis, Morton, Mossyrock, Napavine, Toledo, Winlock and Vader; the Town of Pe Ell Vader; and the unincorporated areas of Lewis County (referred to collectively herein as Lewis County), and aids in the administration of the National Flood Insurance
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