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The Federal Emergency Management Agency in Cooperation with DuPage County, Illinois Presents: FLOOD INSURANCE STUDY A Report of Flood Hazards in: DUPAGE COUNTY, ILLINOIS AND INCORPORATED AREAS Prepared, in parts, by: FEMA Region V Nika Engineering 536 South Clark Street 421 Mill Street Chicago, Illinois 60605 and Batavia, Illiois 60510 March 2007 1 7043CV000A 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. Part or all of this FIS may be revised and republished at any time. In addition, part of this FIS may be revised by the Letter of Map Revision process, which does not involve republication or redistribution of the FIS. It is, therefore, the responsibility of the user to consult with community officials and to check the community repository to obtain the most current FIS components. Initial Countywide FIS Effective Date: December 4, 1985 Revised Countywide FIS Date: June 16, 2004 FLOOD INSURANCE STUDY DuPAGE COUNTY, ILLINOIS TABLE OF CONTENTS Page # 1. INTRODUCTION 1 1.1. Purpose of Study 1 1.2. Authority and Acknowledgments 1 1.3. Coordination 5 1.4. Regional Participation and Progress 7 2. AREA STUDIED 8 2.1. Scope of Study 8 2.2. Community Description 8 2.3. Watershed Description 8 2.3.1. DesPlaines River (DP) 9 2.3.1.1. Geographical Description 9 2.3.1.2. Principal Flood Problems 9 2.3.1.3. Flood Protection Measures 11 2.3.2. DuPage River (DU) 13 2.3.2.1. Geographical Description 13 2.3.2.2. Principal Flood Problems 13 2.3.2.3. Flood Protection Measures 13 2.3.3. East Branch DuPage River (EB) 14 2.3.3.1. Geographical Description 14 2.3.3.2. Principal Flood Problems 14 2.3.3.3. Flood Protection Measures 18 2.3.4. Fox River (FR) 21 2.3.4.1. Geographical Description 21 2.3.4.2. Principal Flood Problems 21 2.3.4.3. Flood Protection Measures 22 2.3.5. Salt Creek (SC) 23 2.3.5.1. Geographical Description 23 2.3.5.2. Principal Flood Problems 23 2.3.5.3. Flood Protection Measures 25 2.3.6. Sawmill Creek (SW) 27 2.3.6.1. Geographical Description 27 2.3.6.2. Principal Flood Problems 27 2.3.6.3. Flood Protection Measures 27 2.3.7. West Branch DuPage River (WB) 29 2.3.7.1. Geographical Description 29 2.3.7.2. Principal Flood Problems 29 2.3.7.3. Flood Protection Measures 33 i TABLE OF CONTENTS - continued 3. ENGINEERING METHODS & FLOOD PLAIN MANAGEMENT APPLICATIONS 36 Note: The following subsections under ENGINEERING METHODS & FLOODPLAIN MANAGEMENT APPLICATIONS do not have page numbers and are clearly marked as tabs. Each tributary shall contain the following elements: Tributary Description, Hydrologic Analysis, Hydraulic Analysis, Flood Boundaries, Floodways and Flood Profiles. As tributaries are updated and approved, these individual tributary tabs can be quickly replaced without the additional work of updating the Table of Contents. The tabs contained herein are as follows: 3.1. DesPlaines River (DP) 3.1.1. Main Stem (DPDP) 3.1.2. Addison Creek (DPAC) 3.1.3. Bensenville Ditch (DPBD) 3.1.4. Black Partridge Creek (DPBP) 3.1.5. Crystal Creek (DPCT) 3.1.6. Flagg Creek (DPFC) 3.1.7. Willow Creek (DPWL) 3.2. DuPage River (DU) 3.2.1. Lily Cache (DULC) 3.2.2. Springbrook #2 (DUSG) 3.3. East Branch DuPage River (EB) 3.3.1. Main Stem (EBEB) 3.3.2. Armitage Creek (EBAR) 3.3.3. Army Trail Road Tributary (EBAT) 3.3.4. Crabtree Creek (EBCR) 3.3.5. Tributary #1 (EBE1) 3.3.6. Tributary #2 (EBE2) 3.3.7. Tributary #3 (EBE3) 3.3.8. Tributary #6 (EBE6) 3.3.9. Tributary #7 (EBE7) 3.3.10. Glen Crest Creek (EBGL) 3.3.11. Glen Park (EBGP) 3.3.12. Lacey Creek (EBLA) 3.3.13. Prentiss Creek (EBPR) 3.3.14. Rott Creek (EBRC) 3.3.15. St. Joseph Creek (EBSJ) 3.3.16. Swift Meadows (EBSM) 3.3.17. 22nd Street (EBTS) 3.3.18. Willoway Brook (EBWI) 3.4. Fox River (FR) 3.4.1. Brewster Creek (FRBC) 3.4.2. Indian Creek (FRIC) 3.4.3. Norton Creek (FRNC) 3.4.4. Waubansee Creek (FRWA) ii TABLE OF CONTENTS - continued 3.5. Salt Creek (SC) 3.5.1. Main Stem (SCSC) 3.5.2. Bronswood Creek (SCBW) 3.5.3. Devon Avenue Tributary (SCDA) 3.5.4. Ginger Creek (SCGC) 3.5.5. Oak Brook Tributary (SCOB) 3.5.6. Spring Brook Creek (SCSB) 3.5.7. Sugar Creek (SCSU) 3.5.8. Westwood Creek (SCWC) 3.6. Sawmill Creek (SW) 3.6.1. Sawmill Creek (SWSW) 3.6.2. Wards Creek (SWWD) 3.7. West Branch DuPage River (WB) 3.7.1. Main Stem (WBWB) 3.7.2. Cress Creek (WBCC) 3.7.3. Ferry Creek (WBFE) 3.7.4. South of Foxcroft (WBFX) 3.7.5. Klein Creek (WBKC) 3.7.6. Kress Creek (WBKR) 3.7.7. Spring Brook #1 (WBSP) 3.7.8. Steeple Run Tributary (WBSR) 3.7.9. Tributary #1 (WBW1) 3.7.10. Tributary #2 (WBW2) 3.7.11. Tributary #3 (WBW3) 3.7.12. Tributary #4 (WBW4) 3.7.13. Tributary #5 (WBW5) 3.7.14. Tributary #6 (WBW6) 3.7.15. Tributary #7 (WBW7) 3.7.16. Tributary #8 (WBW8) 3.7.17. Winfield Creek (WBWF) 3.7.18. Winding Creek (WBWG) 4. INSURANCE APPLICATION 41 4.1. Reach Determinations 41 4.2. Flood Hazard Factors 41 4.3. Flood Insurance Zones 41 4.4. Flood Insurance Rate Map Description 43 5. OTHER STUDIES 44 6. LOCATION OF DATA 46 7. REFERENCES AND BIBLIOGRAPHY 47 FIGURES Figure 1 - Floodway Schematic 40 iii TABLE OF CONTENTS - continued TABLES Table 1 - Tributary Study Acknowledgements 2 Table 2 - Initial and Final CCO Meetings 5 Table 3 - Flagg Creek Recorded Flood Discharges 10 Table 4 - East Branch DuPage River Flood Stages at Army Trail Road 14 Table 5 - East Branch DuPage River August 1972 Recorded Flood Crests 15 Table 6 - Prentiss Creek Flood of Record Recorded Flood Crests at Route 53 17 Table 7 - Spring Brook Salt Creek Flood Stages 24 Table 8 - USGS Recorder Gage of Salt Creek at Western Springs 25 Table 9 - Winfield Creek Gage Readings for 1972 Flood Event 32 EXHIBITS (as can be found in each corresponding tributary TAB in section 3.0) Exhibit 1 - Flood Profiles Addison Creek (DPAC) Panel 01P Addison Creek Tributary No. 1 (DPAC) Panel 02P Addison Creek Tributary No. 2 (DPAC) Panel 03P Addison Creek Tributary No. 3 (DPAC) Panels 04P-05P Armitage Ditch (EBAR) Panels 30P-31P Armitage Fork (EBAR) Panel 32P Bensenville Ditch (Silver Creek) (DPBP) Panels 06P-07P Brewster Creek (FRBC) Panels 85P-86P Briarwood Ditch (SCGC) Panel 98P Bronswood Tributary (SCBW) Panels 91P-93P Crabtree Creek (EBCR) Panels 33P-35P Cress Creek (WBCC) Panel 150P Des Plaines River (DPDP) Panels 08P-09P Devon Avenue Tributary (SCDA) Panel 94P East Branch DuPage River (EBEB) Panels 36P-43P East Branch Sawmill Creek (SWSW) Panels 144P-145P East Branch Tributary No. 1 (EBE1) Panels 44P-45P East Branch Tributary No. 2 (EBE2) Panel 46P East Branch Tributary No. 3 (EBEB) Panels 47P-48P East Branch Tributary No. 4 (EBGL) Panels 49P-50P iv TABLE OF CONTENTS - continued East Branch Tributary No. 5 (EBWI) Panels 51P-53P St. Procopius Creek (EBE6) Panels 54P-55P East Branch Tributary No. 7 (EBE7) Panels 56P-57P Ferry Creek (WBFE) Panels 151P-154P Ferry Creek Tributary No. 1 (WBFE) Panels 155P-157P Flagg Creek (DPFC) Panel 21P Ginger Creek (SCGC) Panels 95P-97P Heritage Oaks Tributary (SCGC) Panel 99P Klein Creek Tributary No. 1 (WBKC) Panels 167P-168P Klein Creek Tributary No. 2 (WBKC) Panel 169P Klein Creek Tributary No. 3 (WBKC) Panel 170P Klein Creek (WBKC) Panels 161P-166P Kress Creek (WBKR) Panels 171P-177P Lacey Creek (EBLA) Panels 58P-60P Lombard Tributary (SCGC) Panel 100P Mays Lake Tributary (SCGC) Panels 101P-102P Meacham Creek (SCSB) Panels 114P-115P Midwest Club Tributary (SCGC) Panel 103P North Branch St. Joseph Creek (EBSJ) Panel 80P Norton Creek (FRNC) Panel 87P Norton Creek Tributary (FRNC) Panel 88P North Unnamed Creek (DPWL) Panel 24P Plainfield Road Ditch (DPFC) Panels 17P-18P Prentiss Creek (EBPR) Panels 61P-64P Rott Creek (EBRC) Panels 65P-68P Salt Creek (SCSC) Panels 116P-130P Sawmill Creek (SWSW) Panels 136P-140P Sawmill Creek Tributary No. 1 (SWSW) Panels 148P-149P Sawmill Creek Tributary No. 3 (DPDP) Panels 10P-15P South Branch St. Joseph Creek (EBSJ) Panels 81P-82P South Fork Westwood Creek (SCWC) Panel 135P South Unnamed Creek (DPWL) Panel 23P Spring Brook Creek (SCSB) Panels 106P-112P Spring Brook No. 1 (WBSP) Panels 180P-184P Spring Brook No. 2 (DUSG) Panels 25P-29P Spring Road Tributary (SCOB) Panels 104P-105P St. Joseph Creek (EBSJ) Panels 69P-75P St. Joseph Creek Tributary (EBSJ) Panel 83P Sugar Creek (SCSU) Panels 131P-132P Sugar Creek Tributary A (SCSU) Panel 133P Tributary 1(A) (EBSJ) Panels 76P-78P Tributary 2(B) (EBSJ) Panel 79P Unnamed Creek (South of Foxcroft Road) (WBFX) Panels 158P-159P Unnamed Stream (North of 22nd Street) (EBTS) Panel 84P Unnamed Creek (South of 87th Street) (WBFX) Panel 160P v TABLE OF CONTENTS - continued Unnamed Tributary to Kress Creek (WBKR) Panels 178P-179P WardsCreek (SWWD) Panel 146P-147P Waubansee Creek (FRWA) Panels 89P-90P West Branch DuPage River (WBWB) Panels 185P-196P West Branch Sawmill Creek (SWSW) Panels 141P-143P West Branch Tributary No.