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Snohomish County, Washington and Incorporated Areas Snohomish County

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Snohomish County, Washington and Incorporated Areas Snohomish County Volume 1 of 3 SNOHOMISH COUNTY, WASHINGTON AND INCORPORATED AREAS SNOHOMISH COUNTY Community Community Number Name ARLINGTON, CITY OF 530271 BOTHELL, CITY OF 530075 BRIER, CITY OF 530276 DARRINGTON, TOWN OF 530233 EDMONDS, CITY OF 530163 EVERETT, CITY OF 530164 GOLD BAR, CITY OF 530285 GRANITE FALLS, TOWN OF 530287 INDEX, TOWN OF 530166 LAKE STEVENS, CITY OF 530291 LYNNWOOD, CITY OF 530167 MARYSVILLE, CITY OF 530168 MILL CREEK, CITY OF 530330 MONROE, CITY OF 530169 MOUNTLAKE TERRACE, CITY OF 530170 MUKILTEO, CITY OF 530235 SNOHOMISH, CITY OF 530171 SNOHOMISH COUNTY, 535534 UNINCORPORATED AREAS STANWOOD, CITY OF 530172 SULTAN, CITY OF 530173 WOODWAY, TOWN OF 530308 PRELIMINARY Federal Emergency Management Agency FLOOD INSURANCE STUDY NUMBER 53061CV001B 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) report may not contain all data available within the Community Map Repository. Please contact the Community Map Repository for any additional data. 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. This FIS report was revised on _________. Users should refer to Section 10.0, Revisions Description, for further information. Section 10.0 is intended to present the most up-to-date information for specific portions of this FIS report. Therefore, users of this report should be aware that the information presented in Section 10.0 supersedes information in Sections 1.0 through 9.0 of this FIS report. Initial Countywide FIS effective date: November 8, 1999 Revised Countywide FIS effective date: September 16, 2005 TABLE OF CONTENTS Volume 1 Page 1.0 INTRODUCTION .......................................................................................................................... 1 1.1 Purpose of Study ................................................................................................................. 1 1.2 Authority and Acknowledgments ........................................................................................ 1 1.3 Coordination........................................................................................................................ 2 2.0 AREA STUDIED ........................................................................................................................... 2 2.1 Scope of Study .................................................................................................................... 2 2.2 Community Description ...................................................................................................... 5 2.3 Principal Flood Problems .................................................................................................. 18 2.4 Flood Protection Measures ................................................................................................ 25 3.0 ENGINEERING METHODS ..................................................................................................... 27 3.1 Hydrologic Analyses ......................................................................................................... 27 3.2 Hydraulic Analyses ........................................................................................................... 33 3.3 Vertical Datum .................................................................................................................. 46 4.0 FLOODPLAIN MANAGEMENT APPLICATIONS ............................................................... 49 4.1 Floodplain Boundaries ...................................................................................................... 49 4.2 Floodways ......................................................................................................................... 50 5.0 INSURANCE APPLICATION ................................................................................................... 85 6.0 FLOOD INSURANCE RATE MAP ........................................................................................... 85 7.0 OTHER STUDIES ....................................................................................................................... 86 8.0 LOCATION OF DATA ............................................................................................................... 89 9.0 BIBLIOGRAPHY AND REFERENCES ................................................................................... 89 i TABLE OF CONTENTS (Cont’d) Volume 1 (Cont’d) Page FIGURES Figure 1 - Floodway Schematic ................................................................................................................... 50 TABLES Table 1 - CCO Meetings ............................................................................................................................... 3 Table 2 - Streams and Tidal Areas Studied by Detailed Methods ................................................................. 6 Table 3 - Streams Studied by Approximate Methods .................................................................................... 8 Table 4 - Peak Discharges ........................................................................................................................... 25 Table 5 - Stream Gaging Stations Operated by the USGS and Periods of Record Analyzed for Detailed Studies ........................................................................................................................... 28 Table 6 - Summary of Elevations ................................................................................................................ 35 Table 7 - Summary of Discharges ............................................................................................................... 36 Table 8 - Manning’s “n” Values.................................................................................................................. 40 Table 9 - Conversion Factors for Flooding Sources .................................................................................... 48 Table 10 - Floodway Data ........................................................................................................................... 53 Table 11 - Community Map History ........................................................................................................... 87 Volume 2 Page 10.0 REVISION DESCRIPTIONS ....................................................................................................... 1 10.1 First Revision ...................................................................................................................... 1 10.2 Second Revision .................................................................................................................. 4 10.3 Third Revision................................................................................................................... 15 TABLES Table 12 - Letters of Map Change ................................................................................................................. 2 Table 13 - Density Fringe Area Data ............................................................................................................. 8 Table 14 - Data Providing Agencies or Firms ............................................................................................. 16 EXHIBITS Exhibit 1 - Flood Profiles Canyon Creek Panels 01P-08P Ebey Slough Panels 09P-13P Ebey-Steamboat Slough Connector Panel 14P Haskel Slough Panel 15P ii TABLE OF CONTENTS (Cont’d) Volume 2 (Cont’d) Exhibit 1 - Flood Profiles (Cont'd) Hat Slough Panel 16P Lower Stillaguamish River Panels 17P-18P Marshland Panels 19P-21P May Creek Panels 22P-25P North Creek Panels 26P-28P North Fork Skykomish River Panels 29P-32P North Fork Stillaguamish River Panels 33P-45P Pilchuck River Panels 46P-52P Riley Slough Panels 53P-55P Sauk River Panels 56P-59P Scriber Creek Panels 60P-62P Volume 3 Exhibit 1 - Flood Profiles (Cont'd) Skykomish River Panels 63P-74P Snohomish River Panels 75P-83P Snoqualmie River Panels 84P-86P Snoqualmie Overflow Reach 1 Panel 87P South-Cook Slough Panels 88P-89P South Fork Stillaguamish River Panels 90P-106P Steamboat Slough Panels 107P-109P Stillaguamish River Panels 110P-115P Stillaguamish River Split Flow Panels 116P-117P Sultan River Panels 118P-120P Swamp Creek Panels 121P-125P Union Slough Panels 126P-127P Wallace River Panels 128P-134P Exhibit 2 - Flood Insurance Rate Map Index Flood Insurance Rate Map iii FLOOD INSURANCE STUDY SNOHOMISH 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 Snohomish County, including the Cities of Arlington, Bothell, Brier, Edmonds, Everett, Gold Bar, Lake Stevens, Lynnwood, Marysville, Mill Creek, Monroe, Mountlake Terrace, Mukilteo, Snohomish, Stanwood, and Sultan; the Towns of Darrington, Granite Falls, Index, and Woodway; and the unincorporated areas of Snohomish County (referred to collectively herein as Snohomish County), and aids in
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