Preliminary FIS 2 of 3

VOLUME 2 OF 3 BLACK HAWK COUNTY, IOWA AND INCORPORATED AREAS

COMMUNITY COMMUNITY NAME NUMBER BLACK HAWK COUNTY, 190535 UNINCORPORATED AREAS CEDAR FALLS, CITY OF 190017 DUNKERTON, CITY OF 190018 ELK RUN HEIGHTS, CITY OF 190019 EVANSDALE, CITY OF 190020 GILBERTVILLE, CITY OF 190021 HUDSON, CITY OF 190022 LAPORTE CITY, CITY OF 190309 RAYMOND, CITY OF 190024 WATERLOO, CITY OF 190025

PRELIMINARY 1/10/2019

REVISED: TBD

FLOOD INSURANCE STUDY NUMBER 19013CV002B Version Number 2.4.3.0

TABLE OF CONTENTS Volume 1 Page

SECTION 1.0 – INTRODUCTION 1 1.1 The National Flood Insurance Program 1 1.2 Purpose of this Flood Insurance Study Report 2 1.3 Jurisdictions Included in the Flood Insurance Study Project 2 1.4 Considerations for using this Flood Insurance Study Report 6

SECTION 2.0 – FLOODPLAIN MANAGEMENT APPLICATIONS 17 2.1 Floodplain Boundaries 17 2.2 Floodways 25 2.3 Base Flood Elevations 26 2.4 Non-Encroachment Zones 26 2.5 Coastal Flood Hazard Areas 27 2.5.1 Water Elevations and the Effects of Waves 26 2.5.2 Floodplain Boundaries and BFEs for Coastal Areas 26 2.5.3 Coastal High Hazard Areas 26 2.5.4 Limit of Moderate Wave Action 26

SECTION 3.0 – INSURANCE APPLICATIONS 27 3.1 National Flood Insurance Program Insurance Zones 27 3.2 Coastal Barrier Resources System 28

SECTION 4.0 – AREA STUDIED 28 4.1 Basin Description 28 4.2 Principal Flood Problems 29 4.3 Non-Levee Flood Protection Measures 30 4.4 Levees 31

SECTION 5.0 – ENGINEERING METHODS 34 5.1 Hydrologic Analyses 34 5.2 Hydraulic Analyses 45 5.3 Coastal Analyses 64 5.3.1 Total Stillwater Elevations 64 5.3.2 Waves 64 5.3.3 Coastal Erosion 64 5.3.4 Wave Hazard Analyses 64 5.4 Alluvial Fan Analyses 65

Figures Page

Figure 1: FIRM Index 9 Figure 2: FIRM Notes to Users 10 Figure 3: Map Legend for FIRM 13 Figure 4: Floodway Schematic 25 Figure 5: Wave Runup Transect Schematic 27 Figure 6: Coastal Transect Schematic 27 Figure 7: Frequency Discharge-Drainage Area Curves 43 Figure 8: 1% Annual Chance Total Stillwater Elevations for Coastal Areas 64 Figure 9: Transect Location Map 64

Tables Page

Table 1: Listing of NFIP Jurisdictions 2 Table 2: Flooding Sources Included in this FIS Report 19 Table 3: Flood Zone Designations by Community 28 Table 4: Coastal Barrier Resources System Information 28 Table 5: Basin Characteristics 28 Table 6: Principal Flood Problems 29 Table 7: Historic Flooding Elevations 30 Table 8: Non-Levee Flood Protection Measures 30 Table 9: Levees 32 Table 10: Summary of Discharges 35 Table 11: Summary of Non-Coastal Stillwater Elevations 43 Table 12: Stream Gage Information used to Determine Discharges 44 Table 13: Summary of Hydrologic and Hydraulic Analyses 46 Table 14: Roughness Coefficients 63 Table 15: Summary of Coastal Analyses 64 Table 16: Tide Gage Analysis Specifics 64 Table 17: Coastal Transect Parameters 64 Table 18: Summary of Alluvial Fan Analyses 65 Table 19: Results of Alluvial Fan Analyses 65

Volume 2 Page

SECTION 6.0 – MAPPING METHODS 66 6.1 Vertical and Horizontal Control 66 6.2 Base Map 66 6.3 Floodplain and Floodway Delineation 67 6.4 Coastal Flood Hazard Mapping 109 6.5 FIRM Revisions 109 6.5.1 Letters of Map Amendment 110 6.5.2 Letters of Map Revision Based on Fill 110

6.5.3 Letters of Map Revision 111 6.5.4 Physical Map Revisions 112 6.5.5 Contracted Restudies 112 6.5.6 Community Map History 113

SECTION 7.0 – CONTRACTED STUDIES AND COMMUNITY COORDINATION 113 7.1 Contracted Studies 113 7.2 Community Meetings 118

SECTION 8.0 – ADDITIONAL INFORMATION 121

SECTION 9.0 – BIBLIOGRAPHY AND REFERENCES 122

Tables Page

Table 20: Countywide Vertical Datum Conversion 66 Table 21: Stream-Based Vertical Datum Conversion 66 Table 22: Base Map Sources 67 Table 23: Summary of Topographic Elevation Data used in Mapping 68 Table 24: Floodway Data 69 Table 25: Flood Hazard and Non-Encroachment Data for Selected Streams 109 Table 26: Summary of Coastal Transect Mapping Considerations 109 Table 27: Incorporated Letters of Map Change 111 Table 28: Community Map History 113 Table 29: Summary of Contracted Studies Included in this FIS Report 113 Table 30: Community Meetings 119 Table 31: Map Repositories 121 Table 32: Additional Information 122 Table 33: Bibliography and References 123

Exhibits

Flood Profiles Panel Big Woods Creek 01-02 P Big Woods Creek Upper Diversion 03 P Black Hawk Creek 04-09 P Blowers Creek 10-13 P Cedar River 14-21 P Cedar River Diversion 22 P City View Branch 23-25 P Crane Creek 26-31 P

iii

Volume 3 Exhibits

Flood Profiles Panel Crossroads Creek 32-34 P Crossroads Creek Diversion 35 P Dry Run Creek at Cedar Falls 36-40 P Dry Run Creek at Waterloo 41-45 P Dry Run Creek Diversion Channel 46 P Dry Run Creek Tributary 1 47 P Dry Run Creek Tributary 2 48 P Elk Run Creek 49-55 P Maywood Branch 56-59 P Miller Creek 60 P Northeast University Branch Tributary 61 P Northwest University Branch Tributary 62 P Poyner Creek 63-64 P Prescotts Creek 65-67 P Sink Creek 68-72 P Southwest Branch Dry Rum Creek 73-74 P Stream No. 13 75-78 P Stream No. 36 79-81 P Stream No. 37 82 P Stream No. 39 83 P Sunnyside Creek 84-86 P Sunnyside Creek Bypass 87-88 P Tributary 1 89 P University Branch Dry Run Creek 90-91 P Unnamed Stream 92 P Unnamed Tributary to Cedar River 93-95 P Unnamed Tributary to Dry Run Creek 96-97 P Virden Creek 98-100 P Virden Creek Tributary 101-102 P West Branch Dry Run Creek 103-104 P West Fork Cedar River 105-106 P Wolf Creek 107-109 P Wolf Creek Overflow 110-112 P

Published Separately

Flood Insurance Rate Map (FIRM)

SECTION 6.0 – MAPPING METHODS

6.1 Vertical and Horizontal Control All FIS Reports and FIRMs are referenced to a specific vertical datum. The vertical datum provides a starting point against which flood, ground, and structure elevations can be referenced and compared. Until recently, the standard vertical datum used for newly created or revised FIS Reports and FIRMs was the National Geodetic Vertical Datum of 1929 (NGVD29). With the completion of the North American Vertical Datum of 1988 (NAVD88), many FIS Reports and FIRMs are now prepared using NAVD88 as the referenced vertical datum.

Flood elevations shown in this FIS Report and on the FIRMs are referenced to NAVD88. These flood elevations must be compared to structure and ground elevations referenced to the same vertical datum. For information regarding conversion between NGVD29 and NAVD88 or other datum conversion, visit the National Geodetic Survey website at www.ngs.noaa.gov.

Temporary vertical monuments are often established during the preparation of a flood hazard analysis for the purpose of establishing local vertical control. Although these monuments are not shown on the FIRM, they may be found in the archived project documentation associated with the FIS Report and the FIRMs for this community. Interested individuals may contact FEMA to access these data.

To obtain current elevation, description, and/or location information for benchmarks in the area, please visit the NGS website at www.ngs.noaa.gov.

Table 20: Countywide Vertical Datum Conversion [Not Applicable to this Flood Risk Project]

Table 21: Stream-Based Vertical Datum Conversion [Not Applicable to this Flood Risk Project]

6.2 Base Map The FIRMs and FIS Report for this project have been produced in a digital format. The flood hazard information was converted to a Geographic Information System (GIS) format that meets FEMA’s FIRM Database specifications and geographic information standards. This information is provided in a digital format so that it can be incorporated into a local GIS and be accessed more easily by the community. The FIRM Database includes most of the tabular information contained in the FIS Report in such a way that the data can be associated with pertinent spatial features. For example, the information contained in the Floodway Data table and Flood Profiles can be linked to the cross sections that are shown on the FIRMs. Additional information about the FIRM Database and its contents can be found in FEMA’s Guidelines and Standards for Flood Risk Analysis and Mapping, www.fema.gov/guidelines-and-standards-flood-risk-analysis-and- mapping.

Base map information shown on the FIRM was derived from the sources described in Table 22.

Table 22: Base Map Sources

Data Data Data Type Data Provider Date Scale Data Description Iowa Geological and Water Survey, Digital Orthophoto 2010 * Digital orthoimagery Department of Natural Resources U.S. Department of Commerce, U.S. Political boundaries 2010 * Municipal and county boundaries Census Bureau, Geography Division Public Land Survey Iowa Department of 1998 1:24,000 PLSS data of Iowa System (PLSS) Natural Resources Transportation Iowa Department of 2010 1:5,000 Road centerlines Features Transportation U.S. Department of Transportation Commerce, U.S. 2016 1:24,000 TIGER Line railroad data Features Census Bureau, Geography Division

6.3 Floodplain and Floodway Delineation The FIRM shows tints, screens, and symbols to indicate floodplains and floodways as well as the locations of selected cross sections used in the hydraulic analyses and floodway computations.

For riverine flooding sources, the mapped floodplain boundaries shown on the FIRM have been delineated using the flood elevations determined at each cross section; between cross sections, the boundaries were interpolated using the topographic elevation data described in Table 23.

In cases where the 1% and 0.2% annual chance floodplain boundaries are close together, only the 1% annual chance floodplain boundary has been shown. Small areas within the floodplain boundaries may lie above the flood elevations but cannot be shown due to limitations of the map scale and/or lack of detailed topographic data.

The floodway widths presented in this FIS Report and on the FIRM were computed for certain stream segments on the basis of equal conveyance reduction from each side of the floodplain. Floodway widths were computed at cross sections. Between cross sections, the floodway boundaries were interpolated. Table 2 indicates the flooding sources for which floodways have been determined. The results of the floodway computations for those flooding sources have been tabulated for selected cross sections and are shown in Table 24, “Floodway Data.”

Table 23: Summary of Topographic Elevation Data used in Mapping

Source for Topographic Elevation Data Vertical Horizontal Community Flooding Source Description Accuracy Accuracy Citation Big Woods Creek, Big Woods Creek Upper Diversion, Black Hawk Creek, Blowers Creek, Cedar River, Cedar River Diversion Channel, City View Branch, Crane Creek, Crossroads Creek, Dry Run Creek at Cedar Falls, Dry Run Creek at Waterloo, Dry Run Creek Diversion Channel, Elk Run Creek, Maywood Branch, Miller Creek, Black Hawk Poyner Creek, County; Cedar Prescotts Creek, Sink Falls; Creek, Southwest Dunkerton, City Light Detection Branch Dry Run 1 meter at IDNR of; Gilbertville, and Ranging data Creek, Stream No. 13, 18.0 cm 95% 2010 City of; Hudson, (LiDAR) Stream No. 36, RMSEz confidence City of; La Porte, Stream No. 39, level City of; Sunnyside Creek, Waterloo, City of Sunnyside Creek Bypass, University Branch Dry Run Creek, Unnamed Tributary to Cedar River, Unnamed Tributary to Dry Run Creek, Virden Creek, Virden Creek Tributary, West Branch Dry Run Creek, West Fork Cedar River, Wolf Creek, Wolf Creek Overflow, Zone A Flooding Sources

BFEs shown at cross sections on the FIRM represent the 1% annual chance water surface elevations shown on the Flood Profiles and in the Floodway Data tables in the FIS Report. Rounded whole-foot elevations may be shown on the FIRM in coastal areas, areas of ponding, and other areas with static base flood elevations.

Table 24: Floodway Data

LOCATION FLOODWAY 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION (FEET NAVD88) SECTION MEAN CROSS 1 WIDTH WITHOUT WITH DISTANCE AREA VELOCITY REGULATORY INCREASE SECTION (FEET) FLOODWAY FLOODWAY (SQ. FEET) (FEET/ SEC)

A 449 49 149 3.7 864.0 860.62 860.6 0.0 B 3,212 55 208 2.7 864.9 864.9 864.9 0.0 C 3,874 108 701 0.8 865.1 865.1 865.1 0.0 D 4,724 205 1,689 0.3 867.4 867.4 867.4 0.0 E 8,083 126 901 0.6 867.4 867.4 868.3 0.9 F 24,506 416 807 1.8 876.8 876.1 877.1 1.0 G 25,923 171 467 3.1 887.1 887.1 887.9 0.8 H 30,748 35 153 9.5 919.7 919.7 920.1 0.4

1Feet from mouth 2Elevations computed without consideration of backwater effects from storage areas or Cedar River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: BIG WOODS CREEK AND INCORPORATED AREAS

A 162 57 157 3.6 871.1 870.22 871.2 1.0 B 414 30 82 7.0 871.3 871.3 872.0 0.7 C 730 40 142 4.0 873.1 873.1 873.8 0.7 D 913 40 144 4.0 873.5 873.5 874.1 0.6 E 1,163 60 217 2.6 873.8 873.8 874.6 0.8 F 1,413 60 223 2.6 874.0 874.0 874.9 0.9 G 1,684 70 308 1.9 874.2 874.2 875.1 0.9 H 1,913 80 242 2.4 874.3 874.3 875.2 0.9 I 2,164 80 258 2.2 874.5 874.5 875.5 1.0 J 2,415 60 230 2.5 874.8 874.8 875.7 0.9 K 2,663 60 208 2.7 875.0 875.0 875.9 0.9 L 2,913 60 208 2.7 875.2 875.2 876.2 1.0 M 3,162 70 269 2.1 875.5 875.5 876.5 1.0 N 3,311 70 308 1.9 875.6 875.6 876.6 1.0 O 3,396 80 392 1.5 875.6 875.6 876.6 1.0 P 3,437 90 433 1.3 875.7 875.7 876.6 0.9

1Feet above storage area from Big Woods Creek 2Elevations computed without consideration of backwater effects from Big Woods Creek

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: BIG WOODS CREEK UPPER DIVERSION AND INCORPORATED AREAS

A 214 270 N/A N/A 854.3 843.22 843.2 0.0 B 1,344 330 N/A N/A 854.3 843.22 843.2 0.0 C 1,458 350 N/A N/A 854.3 844.62 844.6 0.0 D 2,248 470 N/A N/A 854.3 846.62 846.6 0.0 E 2,399 400 N/A N/A 854.3 847.52 847.5 0.0 F 2,545 320 N/A N/A 854.3 847.52 847.5 0.0 G 2,800 390 N/A N/A 854.3 848.52 848.5 0.0 H 2,975 390 N/A N/A 854.3 848.72 848.7 0.0 I 3,760 370 N/A N/A 854.3 848.72 848.7 0.0 J 3,950 435 N/A N/A 854.3 849.72 849.7 0.0 K 4,255 570 N/A N/A 854.3 850.52 850.5 0.0 L 4,499 1,630 N/A N/A 854.3 851.42 851.4 0.0 M 6,694 1,870 N/A N/A 854.3 851.72 851.7 0.0 N 6,849 1,765 N/A N/A 854.3 851.82 851.8 0.0 O 7,939 1,565 N/A N/A 854.3 851.82 851.8 0.0 P 9,949 1,570 N/A N/A 854.3 852.02 852.0 0.0 Q 10,154 1,595 N/A N/A 854.3 853.02 853.0 0.0 R 12,584 1,470 N/A N/A 854.3 853.42 853.4 0.0 S 14,599 2,600 N/A N/A 854.3 853.72 853.7 0.0 T 16,009 1,590 N/A N/A 854.3 853.92 853.9 0.0 U 18,349 1,013 6,530 3.2 856.3 856.3 857.0 0.7 V 21,359 2,185 11,878 1.7 858.1 858.1 858.9 0.8

1Feet above confluence with Cedar River. See 2011 Black Hawk County stream profile, reprinted on profile sheet 08P(a) 2Elevations computed without consideration of backwater effects from Cedar River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: BLACK HAWK CREEK AND INCORPORATED AREAS

LOCATION FLOODWAY 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION (FEET NAVD88) SECTION MEAN CROSS 3 WIDTH WITHOUT WITH DISTANCE AREA VELOCITY REGULATORY INCREASE SECTION (FEET) FLOODWAY FLOODWAY (SQ. FEET) (FEET/SEC)

W 25,722 1,731 4,074 5.1 860.5 860.5 860.9 0.4 X 27,793 1,800 10,721 1.9 862.7 862.7 863.6 0.9 Y 28,002 1,700 11,016 1.9 863.0 863.0 863.7 0.7 Z 30,882 3,061 12,050 1.7 863.9 863.9 864.8 0.9 AA 35,129 2,770 13,872 1.5 865.7 865.7 866.4 0.7 AB 36,596 890 7,936 2.6 866.6 866.6 867.0 0.6 AC 41,636 1,339 10,543 2.0 868.3 868.3 869.2 0.9 AD 45,107 1,870 10,012 3.1 870.5 870.5 871.1 0.6 AE 45,220 1,880 10,216 6.5 870.5 870.5 871.0 0.5 AF 46,283 2,110 11,589 4.1 870.9 870.9 871.7 0.8 AG 47,918 2,140 9,366 6.5 871.7 871.7 872.4 0.7 AH 50,276 2,337 9,508 6.1 873.0 873.0 873.8 0.8 AI 51,857 2,650 8,742 6.4 874.0 874.0 875.0 1.0 AJ 52,722 2,697 11,307 4.7 874.6 874.6 875.5 0.9 AK 53,263 2,509 11,039 5.0 874.9 874.9 875.9 1.0 AL 54,830 2,841 11,938 4.5 875.5 875.5 876.5 1.0 AM 56,680 2,862 15,598 4.1 876.1 876.1 877.0 0.9 AN 59,213 2,340 10,656 5.3 876.8 876.8 877.7 0.9 AO 60,034 1,860 8,250 6.6 877.5 877.5 878.1 0.6 AP 61,492 2,040 10,614 5.2 878.7 878.7 879.1 0.4 AQ 62,488 2,160 11,321 6.2 879.2 879.2 879.5 0.3 AR 64,184 1,970 11,980 5.6 880.0 880.0 880.5 0.5 AS 65,984 1,830 11,734 5.0 880.6 880.6 881.4 0.8 AT 67,387 1,540 11,534 5.4 881.1 881.1 882.1 1.0

3This portion of Black Hawk Creek redelineated, and distance references feet above confluence with Cedar River.

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: BLACK HAWK CREEK AND INCORPORATED AREAS

LOCATION FLOODWAY 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION (FEET NAVD88) SECTION MEAN CROSS WIDTH WITHOUT WITH DISTANCE3 AREA VELOCITY REGULATORY INCREASE SECTION (FEET) FLOODWAY FLOODWAY (SQ. FEET) (FEET/SEC)

AU 68,402 1,660 10,195 6.1 881.8 881.8 882.6 0.8 AV 70,099 1,360 6,688 6.4 883.1 883.1 883.8 0.7 AW 70,585 935 4,388 4.7 883.8 883.8 884.4 0.6 AX 70,953 1,330 7,042 5.0 884.4 884.4 884.9 0.5 AY 71,870 1,592 10,366 5.9 884.9 884.9 885.3 0.4 AZ 73,180 2,289 17,338 2.4 885.2 885.2 885.8 0.6 BA 74,386 2,330 14,068 3.0 885.3 885.3 885.8 0.5 BB 75,720 2,240 12,648 3.7 885.4 885.4 886.0 0.6 BC 77,452 1,880 10,004 4.9 885.7 885.7 886.4 0.7 BD 78,677 2,276 8,839 4.1 886.2 886.2 887.1 0.9 BE 80,468 2,550 11,113 4.2 886.8 886.8 887.8 1.0 BF 82,022 2,636 11,908 4.3 887.2 887.2 888.1 0.9 BG 83,663 2,237 10,315 4.7 887.6 887.6 888.6 1.0 BH 86,856 1,200 5,518 3.6 890.4 890.4 891.3 0.9 BI 93,700 2,524 15,586 1.3 894.2 894.2 895.2 1.0 BJ 97,693 2,500 13,585 1.5 895.5 895.5 896.4 0.9 BK 102,590 2,500 12,102 1.6 897.3 897.3 898.2 0.9 BL 105,631 2,499 12,558 1.6 898.5 898.5 899.3 0.8 BM 109,888 2,337 16,531 1.2 899.5 899.5 900.5 1.0

3This portion of Black Hawk Creek redelineated, and distance references feet above confluence with Cedar River.

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: BLACK HAWK CREEK AND INCORPORATED AREAS

LOCATION FLOODWAY 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION (FEET NAVD88) SECTION MEAN CROSS WIDTH WITHOUT WITH DISTANCE AREA VELOCITY REGULATORY INCREASE SECTION (FEET) FLOODWAY FLOODWAY (SQ. FEET) (FEET/SEC)

A 1,1181 70 921 5.1 838.4 838.4 838.7 0.3 B 1,4031 160 1,834 2.6 838.8 838.8 839.4 0.6 C 2,1521 90 1,076 4.4 838.8 838.8 839.5 0.7 D 2,2581 90 1,158 4.1 839.1 839.1 840.0 0.9 E 2,7151 70 903 5.2 839.3 839.3 840.2 0.9 F 3,1261 141 1,755 2.7 839.9 839.9 840.9 1.0 G 3,3131 141 1,775 2.7 840.0 840.0 841.0 1.0 H 3,5851 70 746 6.3 840.0 840.0 840.8 0.8 I 4,2271 85 747 6.3 840.7 840.7 841.6 0.9 J 5,1351 100 655 7.2 842.6 842.6 843.0 0.4 K 5,5731 80 683 6.9 844.3 844.3 844.5 0.2 L 6,5631 130 948 5.0 846.0 846.0 846.4 0.4 M 7,3901 170 885 5.3 847.0 847.0 847.5 0.4 N 8,2701 125 753 5.1 849.1 849.1 849.2 0.1 O 8,9121 170 921 4.1 850.0 850.0 850.2 0.2 P 9,7431 68 195 7.7 850.9 850.9 851.0 0.1 Q 10,0171 73 321 5.2 852.7 852.7 852.8 0.0 R 10,1331 73 619 3.0 855.4 855.4 855.5 0.0 S 10,5661 139 542 2.8 855.7 855.7 855.7 0.0 T 11,2132 94 192 7.8 856.3 856.3 856.3 0.0 U 11,6422 215 380 4.0 860.4 860.4 860.4 0.0 V 12,0692 350 652 2.3 863.2 863.2 863.2 0.0 W 12,1462 236 957 2.2 863.8 863.8 863.9 0.1 X 12,3612 175 505 3.0 864.5 864.5 864.5 0.0

1Feet above mouth with Cedar River. See 2011 Black Hawk County stream profile, reprinted on profile sheets 2This portion of Blowers Creek redelineated, and distance references feet above confluence with Cedar River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: BLOWERS CREEK AND INCORPORATED AREAS

LOCATION FLOODWAY 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION (FEET NAVD88) SECTION MEAN CROSS 2 WIDTH WITHOUT WITH DISTANCE AREA VELOCITY REGULATORY INCREASE SECTION (FEET) FLOODWAY FLOODWAY (SQ. FEET) (FEET/SEC)

Y 12,530 150 540 2.8 864.8 864.8 864.9 0.1 Z 12,608 54 1,547 6.5 865.3 865.3 865.3 0.0 AA 13,402 52 227 6.6 868.2 868.2 868.2 0.0 AB 13,846 40 173 7.9 870.0 870.0 870.2 0.2 AC 15,063 240 764 1.8 873.0 873.0 872.9 0.0 AD 16,162 185 333 4.1 873.8 873.8 874.2 0.5 AE 16,800 170 326 4.2 876.5 876.5 877.0 0.5

2This portion of Blowers Creek redelineated, and distance references feet above confluence with Cedar River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA

FLOODING SOURCE: BLOWERS CREEK AND INCORPORATED AREAS

A 135.641 1,625 24,263 3.9 805.5 805.5 806.4 0.9 B 137.751 4,000 61,311 1.5 808.5 808.5 809.5 1.0 C 138.961 1,900 29,962 3.1 809.7 809.7 810.7 1.0 D 139.781 1,610 29,386 3.2 812.1 812.1 813.1 1.0 E 140.391 1,940 33,723 2.8 813.0 813.0 814.0 1.0 F 141.351 6,175 86,791 1.1 814.1 814.1 815.0 0.9 G 142.071 6,600 88,851 1.1 814.7 814.7 815.5 0.8 H 144.191 5,900 58,797 1.6 816.2 816.2 817.2 1.0 I 146.361 4,825 35,378 2.7 820.0 820.0 820.8 0.8 J 148.621 5,700 55,974 1.7 824.5 824.5 825.5 1.0 K 149.601 5,600 56,285 1.7 825.7 825.7 826.7 1.0 L 151.081 4,000 43,304 2.2 827.4 827.4 828.3 0.9 M 191.002 3,300 27,468 3.4 831.6 831.6 832.4 0.8 N 192.002 3,200 30,229 3.1 834.4 834.4 835.1 0.7 O 192.702 3,200 24,608 3.8 835.8 835.8 836.7 0.9 P 193.152 2,245 19,837 4.7 836.8 836.8 837.7 0.9 Q 194.202 2,800 23,022 7.3 839.3 839.3 839.9 0.6 R 195.202 2,975 24,518 6.6 840.5 840.5 841.2 0.7 S 196.802 5,220 26,062 3.6 842.8 842.8 842.8 0.0 T 197.992 820 11,774 8.0 844.3 844.3 844.3 0.0 U 198.022 930 14,262 6.6 844.8 844.8 844.8 0.0 V 198.322 660 11,777 8.0 845.2 845.2 845.2 0.0 W 198.442 740 16,873 5.6 846.2 846.2 846.2 0.0 X 198.632 540 14,663 6.4 846.3 846.3 846.3 0.0

1This portion of Cedar River redelineated, and distance references miles above confluence with Iowa River 2Miles above mouth. See 2011 Black Hawk County stream profile, reprinted on profile sheets

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: CEDAR RIVER AND INCORPORATED AREAS

Y 198.952 530 13,183 7.1 846.7 846.7 846.7 0.0 Z 199.252 780 13,484 7.0 848.1 848.1 848.1 0.0 AA 199.392 710 11,503 8.2 848.3 848.3 848.3 0.0 AB 199.482 690 10,802 8.7 848.7 848.7 848.7 0.0 AC 199.542 670 11,119 8.5 851.5 851.5 851.5 0.0 AD 199.752 660 13,503 7.0 852.6 852.6 852.6 0.0 AE 199.822 720 15,251 6.2 853.0 853.0 853.0 0.0 AF 200.272 950 15,079 6.2 853.8 853.8 853.8 0.0 AG 201.122 1,400 19,977 4.7 855.1 855.1 855.1 0.0 AH 201.212 1,245 21,721 4.3 855.5 855.5 855.5 0.0 AI 201.282 1,415 19,602 4.8 855.7 855.7 855.7 0.0 AJ 201.922 3,580 56,612 1.7 856.6 856.6 856.6 0.0 AK 203.462 2,999 41,759 2.3 857.3 857.3 857.4 0.1 AL 204.202 2,999 34,545 2.7 857.7 857.7 858.0 0.3 AM 166.581 2,199 48,900 1.9 858.2 858.2 858.8 0.6 AN 167.251 4,267 43,331 2.2 859.2 859.2 859.3 0.1 AO 167.921 1,730 18,442 4.2 859.7 859.7 859.8 0.1 AP 168.591 2,830 29,842 2.6 861.6 861.6 861.6 0.0 AQ 168.921 906 15,290 5.1 861.7 861.7 861.8 0.1 AR 169.201 501 7,576 10.2 861.8 861.8 862.0 0.2 AS 169.301 530 7,811 9.9 861.9 861.9 862.1 0.2 AT 169.351 550 8,893 8.7 863.0 863.0 863.1 0.1 AU 169.511 4,130 59,237 1.6 865.1 865.1 865.2 0.1

1This portion of Cedar River redelineated, and distance references miles above confluence with Iowa River 2Miles above mouth. See 2011 Black Hawk County stream profile, reprinted on profile sheets

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: CEDAR RIVER AND INCORPORATED AREAS

AV 169.60 3,863 37,383 2.5 865.5 865.5 865.5 0.0 AW 171.03 4,445 39,176 2.4 868.1 868.1 868.3 0.2 AX 171.40 4,594 35,954 2.6 868.6 868.6 868.7 0.1 AY 171.90 4,571 49,939 1.9 869.3 869.3 869.5 0.2 AZ 172.37 4,150 51,229 1.8 869.8 869.8 870.0 0.2 BA 173.48 5,400 66,296 1.4 871.1 871.1 871.9 0.8 BB 174.87 5,000 49,604 1.9 872.7 872.7 873.7 1.0 BC 175.51 3,500 32,832 2.9 874.0 874.0 874.8 0.8 BD 177.21 3,500 31,654 3.0 877.9 877.9 878.4 0.5 BE 178.36 2,000 22,397 2.1 880.8 880.8 881.1 0.3 BF 179.31 2,100 21,280 2.2 882.0 882.0 882.5 0.5 BG 180.64 1,586 15,093 3.1 884.0 884.0 884.8 0.8

1This portion of Cedar River redelineated, and distance references miles above confluence with Iowa River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: CEDAR RIVER AND INCORPORATED AREAS

A 9,876 512 5,439 3.1 860.4 860.4 860.8 0.4 B 10,430 550 5,633 3.0 861.8 861.8 862.0 0.2 C 10,964 1,550 17,038 1.0 862.8 862.8 863.0 0.2 D 11,522 2,030 8,811 1.9 863.0 863.0 863.2 0.2 E 12,402 2,980 26,891 0.6 863.5 863.5 864.0 0.5 F 16,516 5,100 68,055 0.2 864.0 864.0 864.5 0.5 G 18,481 3,150 30,139 0.6 864.0 864.0 864.5 0.5

1Feet above confluence with Cedar River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: CEDAR RIVER DIVERSION AND INCORPORATED AREAS

A 1701 113 330 2.9 847.0 846.03 847.0 1.0 B 3701 88 276 3.4 847.2 847.2 847.5 0.3 C 7601 60 240 4.0 848.5 848.5 849.2 0.7 D 9501 85 354 2.7 848.9 848.9 849.8 0.9 E 1,1551 80 334 2.8 849.4 849.4 850.3 0.9 F 1,2601 56 239 4.0 849.6 849.6 850.5 0.9 G 1,3151 19 81 11.8 850.6 850.6 850.6 0.0 H 1,4801 64 492 1.9 854.9 854.9 855.5 0.6 I 1,7851 71 404 2.3 854.9 854.9 855.5 0.6 J 1,9682 50 286 3.3 854.9 854.9 855.6 0.7 K 2,2672 71 281 3.4 855.0 855.0 856.0 1.0 L 2,5702 68 244 3.9 855.6 855.6 856.6 1.0 M 2,8672 62 224 4.2 856.5 856.5 857.4 0.9 N 3,0352 84 404 2.0 859.7 859.7 860.2 0.5 O 3,2742 81 337 2.4 859.9 859.9 860.4 0.5 P 4,1462 66 187 4.3 861.6 861.6 861.7 0.1

1Feet above mouth at Blowers Creek. See 2011 Black Hawk County stream profile, reprinted on profile sheets 2This portion of City View Branch redelineated, and distance references feet above confluence with Blowers Creek 3Elevations computed without consideration of backwater effects from Cedar River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: CITY VIEW BRANCH AND INCORPORATED AREAS

A 3,440 610 6,216 2.5 936.3 936.3 937.2 0.9 B 3,598 610 6,298 2.5 936.9 936.9 937.8 0.9 C 4,029 891 7,686 2.5 937.1 937.1 937.9 0.8 D 5,057 1,032 8,077 4.0 937.6 937.6 938.4 0.8 E 5,702 1,004 6,329 3.8 938.0 938.0 938.8 0.8 F 6,957 701 5,642 3.0 938.6 938.6 939.4 0.8 G 8,411 760 5,576 3.0 939.0 939.0 939.9 0.9 H 9,271 931 5,577 3.4 939.4 939.4 940.3 0.9 I 10,886 905 6,436 5.3 940.5 940.5 941.3 0.8 J 11,694 770 5,615 4.1 941.3 941.3 942.3 1.0 K 12,170 590 5,223 4.1 941.7 941.7 942.7 1.0 L 12,383 590 5,077 4.0 942.4 942.4 943.2 0.8 M 12,964 820 4,978 4.2 943.1 943.1 943.8 0.7 N 13,706 1,463 6,763 2.3 944.2 944.2 944.8 0.6 O 15,584 1,667 11,134 2.5 945.0 945.0 945.8 0.8 P 16,146 1,950 12,485 2.2 945.1 945.1 946.0 0.9 Q 17,398 1,570 9,793 2.6 945.4 945.4 946.4 1.0 R 19,135 1,080 7,145 2.8 946.1 946.1 947.1 1.0 S 19,516 810 6,359 3.0 946.6 946.6 947.5 0.9 T 20,404 745 5,094 3.7 947.6 947.6 948.3 0.7 U 20,882 960 5,868 3.1 948.7 948.7 949.2 0.5 V 21,511 910 8,671 2.2 949.3 949.3 949.8 0.5 W 22,570 1,143 8,098 2.0 949.4 949.4 950.2 0.8

1Feet above confluence with Wapsipinicon River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: CRANE CREEK AND INCORPORATED AREAS

X 22,969 1,343 8,673 1.6 949.5 949.5 950.3 0.8 Y 24,174 2,160 12,491 2.0 949.6 949.6 950.5 0.9 Z 25,014 1,490 9,399 2.1 949.9 949.9 950.7 0.8 AA 25,557 1,320 7,911 1.8 950.2 950.2 950.9 0.7 AB 26,591 1,200 7,358 3.8 950.7 950.7 951.5 0.8 AC 28,349 1,240 7,055 2.1 951.5 951.5 952.2 0.7 AD 29,039 1,190 7,173 2.2 951.7 951.7 952.4 0.7 AE 29,171 1,190 7,812 2.0 951.9 951.9 952.7 0.8

1Feet above confluence with Wapsipinicon River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: CRANE CREEK AND INCORPORATED AREAS

A 2231 28 234 11.9 840.0 829.03 829.8 0.8 B 5762 23 171 16.0 840.0 830.03 830.0 0.0 C 1,1172 21 223 11.6 842.2 842.2 842.2 0.0 D 1,1502 140 917 3.2 844.8 844.8 844.8 0.0 E 1,7042 80 451 5.4 844.9 844.9 844.9 0.0 F 1,8652 121 841 3.3 845.4 845.4 845.4 0.0 G 2,0492 59 365 6.0 845.7 845.7 845.7 0.0 H 2,6322 58 207 11.0 848.3 848.3 848.3 0.0 I 3,1312 50 245 8.7 852.4 852.4 852.6 0.2 J 3,6002 60 211 10.7 855.6 855.6 855.7 0.1 K 4,0752 56 260 8.5 859.5 859.5 859.5 0.0 L 4,5622 69 324 7.1 861.6 861.6 861.7 0.1 M 5,0502 57 264 8.5 863.2 863.2 863.2 0.0 N 5,2902 41 341 6.3 864.8 864.8 864.8 0.0 O 5,4192 42 314 5.3 865.3 865.3 865.4 0.1 P 5,6132 45 249 7.4 865.5 865.5 865.6 0.1 Q 5,9622 40 198 9.1 866.4 866.4 866.6 0.2 R 6,2092 41 226 7.5 867.7 867.7 867.9 0.2 S 6,3602 42 237 7.1 868.0 868.0 868.5 0.5 T 6,4532 42 241 6.9 869.0 869.0 869.1 0.1 U 6,9172 61 179 10.1 871.5 871.5 871.6 0.1 V 7,5432 57 521 4.4 877.6 877.6 878.5 0.9 W 7,8342 100 212 1.8 881.6 881.6 882.6 1.0

1Feet above mouth at Cedar River. See 2011 Black Hawk County stream profile, reprinted on profile sheets 2This portion of Crossroads Creek redelineated, and distance references feet above confluence with Cedar River 3Elevation computed without consideration of backwater effects from Cedar River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: CROSSROADS CREEK AND INCORPORATED AREAS

A 485 481 2,703 3.0 860.9 852.32 852.4 0.1 B 606 218 1,920 4.2 860.9 855.22 855.3 0.1 C 832 322 1,888 4.2 860.9 855.42 855.5 0.1 D 1,182 504 2,523 3.2 860.9 855.72 855.8 0.1 E 2,081 66 659 12.2 860.9 855.82 855.8 0.0 F 2,405 99 1,029 7.8 860.9 858.22 858.3 0.1 G 3,285 235 1,116 7.1 860.9 859.82 859.9 0.1 H 3,650 200 789 10.1 860.9 860.9 861.0 0.1 I 3,988 117 1,160 6.9 862.9 862.9 863.0 0.1 J 4,150 129 1,331 4.8 863.3 863.3 863.4 0.1 K 4,861 138 1,352 4.7 864.0 864.0 864.1 0.1 L 5,778 96 827 6.4 864.9 864.9 865.1 0.2 M 6,265 127 989 6.3 865.5 865.5 865.6 0.1 N 6,410 60 644 9.7 865.5 865.4 865.6 0.2 O 6,718 71 627 2.9 867.4 867.4 867.5 0.1 P 7,394 59 462 4.0 867.7 867.7 867.8 0.1 Q 7,630 79 488 3.8 868.0 868.0 868.1 0.1 R 8,543 54 278 6.6 869.4 869.4 869.6 0.2 S 8,903 30 223 8.2 870.2 870.2 870.4 0.2 T 9,581 60 311 5.9 872.6 872.6 872.8 0.2 U 9,955 41 223 8.2 873.4 873.4 873.6 0.2 V 10,520 39 207 8.9 875.6 875.6 875.6 0.0 W 10,840 129 557 3.3 877.5 877.5 877.6 0.1 X 11,582 33 241 7.1 878.4 878.4 878.6 0.2

1Feet above confluence with Cedar River 2Elevations computed without consideration of backwater effects from Cedar River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: DRY RUN CREEK AT CEDAR FALLS AND INCORPORATED AREAS

Y 11,965 33 212 8.1 879.1 879.1 879.3 0.2 Z 13,393 194 601 2.9 884.0 884.0 884.1 0.1 AA 14,486 173 410 4.2 886.7 886.7 886.7 0.0 AB 15,771 160 561 3.1 890.5 890.5 890.7 0.2 AC 18,146 450 1,879 1.2 898.7 898.7 898.7 0.0 AD 19,128 306 939 2.4 899.0 899.0 899.0 0.0 AE 20,202 258 628 3.6 900.6 900.6 900.7 0.1 AF 20,958 318 899 2.5 902.8 902.8 902.9 0.1 AG 21,772 208 578 3.9 904.1 904.1 904.2 0.1 AH 23,074 436 556 2.3 906.0 906.0 906.1 0.1 AI 23,466 20 157 8.3 906.2 906.2 906.4 0.2 AJ 23,608 964 341 3.8 916.5 916.5 916.5 0.0 AK 23,808 980 5,929 0.7 916.8 916.8 916.8 0.0 AL 27,300 280 726 5.7 917.1 917.1 917.1 0.0 AM 27,711 380 2,092 2.0 921.1 921.1 921.1 0.0 AN 29,858 430 1,328 3.1 922.5 922.5 923.3 0.8 AO 30,107 537 2,710 1.5 926.7 926.7 926.7 0.0 AP 31,520 377 1,007 4.1 928.1 928.1 928.1 0.0 AQ 32,120 381 1,383 2.5 928.4 928.4 929.3 0.9

1Feet above confluence with Cedar River

TAB FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA LE24 BLACK HAWK COUNTY, IOWA FLOODING SOURCE: DRY RUN CREEK AT CEDAR FALLS AND INCORPORATED AREAS

A 6,5121 49 222 8.3 860.5 860.5 861.5 1.0 B 7,0291 135 522 2.6 861.8 861.8 862.8 1.0 C 7,4711 90 251 5.4 862.2 862.2 863.0 0.8 D 7,7151 83 201 6.9 863.3 863.3 863.8 0.5 E 7,8251 54 203 5.9 865.6 865.6 865.6 0.0 F 8,2071 52 178 6.8 866.7 866.7 866.7 0.0 G 8,5081 48 168 7.3 867.7 867.7 867.7 0.0 H 8,8681 77 235 5.9 868.9 868.9 868.9 0.0 I 8,1271 52 145 8.6 869.4 869.4 869.4 0.0 J 8,2051 75 315 5.5 872.0 872.0 872.0 0.0 K 9,5341 90 342 4.2 872.6 872.6 872.6 0.0 L 10,0191 29 126 9.5 872.7 872.7 872.7 0.0 M 10,4581 31 187 6.4 875.0 875.0 875.3 0.3 N 10,5231 33 223 5.4 876.3 876.3 876.4 0.1 O 12,1032 52 209 5.9 877.1 877.1 877.2 0.1 P 12,6382 42 138 1.3 878.5 878.5 878.6 0.1 Q 12,7322 27 73 2.5 878.5 878.5 878.6 0.1 R 13,1302 40 106 1.7 878.8 878.8 878.8 0.0 S 13,5622 37 63 2.8 879.1 879.1 879.1 0.0 T 13,7132 265 773 0.2 889.3 889.3 890.2 0.9 U 14,1242 608 2,057 0.6 889.3 889.3 890.2 0.9 V 14,5852 57 271 3.3 889.3 889.2 890.1 0.9 W 14,7082 44 222 4.0 890.0 890.0 890.6 0.6 X 14,9652 40 164 6.0 890.4 890.4 890.8 0.4 Y 15,1982 42 152 5.8 891.2 891.2 891.4 0.2 Z 15,2342 50 243 3.6 893.8 893.8 894.0 0.2 1Feet above mouth. See 2011 Black Hawk County stream profile, reprinted on profile sheets 2This portion of Dry Run Creek at Waterloo redelineated, and distance references feet above confluence with Cedar River TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA

FLOODING SOURCE: DRY RUN CREEK AT WATERLOO AND INCORPORATED AREAS

AA 15,726 210 868 1.0 894.4 894.4 894.6 0.2 AB 16,366 124 551 1.6 895.0 895.0 895.2 0.2 AC 16,751 65 312 2.8 895.2 895.2 895.4 0.2 AD 17,135 29 89 9.9 896.6 896.6 896.6 0.0 AE 17,422 53 288 3.2 902.6 902.6 902.6 0.0 AF 17,626 57 305 3.8 902.7 902.7 902.7 0.0 AG 17,785 57 279 1.6 903.0 903.0 903.0 0.0 AH 17,884 56 214 2.1 903.0 903.0 903.0 0.0 AI 18,017 48 169 2.6 903.7 903.7 903.7 0.0 AJ 18,438 50 121 3.7 904.0 904.0 904.0 0.0 AK 18,901 60 127 3.5 904.8 904.8 904.8 0.0 AL 19,626 40 63 7.1 908.2 908.2 908.2 0.0 AM 19,861 46 347 1.3 915.9 915.9 915.9 0.0 AN 20,338 121 663 2.8 915.9 915.9 915.9 0.0 AO 21,093 65 203 9.4 916.0 916.0 916.1 0.1 AP 21,222 143 991 2.2 920.2 920.2 921.2 1.0 AQ 21,704 75 278 6.4 920.2 920.1 921.0 0.9 AR 22,364 150 369 7.0 922.8 922.8 923.3 0.5 AS 22,449 320 1,370 1.7 926.4 926.4 927.4 1.0 AT 22,700 93 218 9.1 926.6 926.6 927.6 1.0 AU 23,080 225 644 3.1 928.5 928.5 929.4 0.9 AV 23,522 85 214 9.8 930.7 930.7 931.3 0.6 AW 24,012 99 294 6.3 934.2 934.2 935.0 0.8 AX 24,406 89 210 8.8 939.0 939.0 939.6 0.6 AY 24,837 71 326 6.4 941.6 941.6 942.6 1.0 2This portion of Dry Run Creek at Waterloo redelineated, and distance references feet above confluence with Cedar River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: DRY RUN CREEK AT WATERLOO AND INCORPORATED AREAS

A 442 199 1,946 0.4 864.4 864.4 864.5 0.1 B 783 447 2,905 0.3 864.6 864.6 864.7 0.1 C 1,291 206 1,761 0.5 864.6 864.6 864.7 0.1

1Feet above confluence with Dry Run Creek at Cedar Falls

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA

FLOODING SOURCE: DRY RUN CREEK DIVERSION CHANNEL AND INCORPORATED AREAS

A 3001 640 6,596 1.1 836.3 833.13 834.1 1.0 B 1,0701 282 3,446 2.1 836.3 833.43 834.3 0.9 C 3,9201 750 5,115 1.4 836.3 834.63 835.3 0.7 D 6,2701 710 3,722 1.9 836.3 835.93 836.5 0.6 E 9,8001 200 1,339 5.3 840.5 840.5 841.0 0.5 F 10,6001 401 2,373 3.0 842.5 842.5 842.8 0.3 G 10,9901 300 1,315 5.4 842.9 842.9 843.2 0.3 H 11,6001 180 1,363 5.2 845.1 845.1 845.4 0.3 I 11,9601 450 2,505 2.8 845.9 845.9 846.0 0.1 J 12,5001 900 3,850 1.8 846.0 846.0 846.6 0.6 K 14,0001 900 3,208 2.2 846.7 846.7 847.5 0.8 L 16,7801 900 2,961 2.4 849.7 849.7 850.6 0.9 M 20,8381 325 2,529 2.6 851.8 851.8 852.7 0.9 N 29,7482 500 2,707 2.4 863.2 863.2 864.2 1.0 O 33,6312 300 2,070 3.0 867.3 867.3 867.6 0.3 P 34,7952 300 1,756 3.5 867.7 867.7 868.2 0.5 Q 39,0142 450 2,180 2.4 870.4 870.4 871.3 0.9 R 41,9332 300 1,844 2.5 875.5 875.5 875.7 0.2

1Feet above confluence with Cedar River. See 2011 Black Hawk County stream profile, reprinted on profile sheets 2This portion of Elk Run Creek redelineated, and distance references feet above confluence with Cedar River 3Elevations computed without consideration of backwater effects from Cedar River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA

FLOODING SOURCE: ELK RUN CREEK AND INCORPORATED AREAS

A 1,7201 92 470 4.6 853.5 853.5 853.7 0.2 B 1,8101 173 1,275 1.7 857.3 857.3 857.3 0.0 C 2,8451 160 977 1.9 857.4 857.4 857.5 0.1 D 3,2951 143 817 2.3 857.5 857.5 857.7 0.2 E 4,6301 345 1,307 1.4 858.8 858.8 859.8 1.0 F 4,6651 300 1,391 1.3 861.8 861.8 862.8 1.0 G 5,9151 140 1,222 1.2 862.6 862.6 863.6 1.0 H 6,4882 257 684 2.1 864.5 864.5 864.7 0.2 I 7,5142 97 318 3.2 866.8 866.8 867.8 1.0 J 8,4612 278 799 1.3 868.9 868.9 869.9 1.0 K 10,3382 145 272 3.7 873.0 873.0 873.5 0.5 L 10,3892 180 1,195 0.8 877.8 877.8 878.4 0.6 M 10,9352 271 1,046 1.0 877.8 877.8 878.5 0.7 N 11,3482 180 383 2.6 877.9 877.9 878.9 1.0 O 11,7832 120 331 3.0 880.6 880.6 881.6 1.0 P 12,1102 30 98 10.3 883.2 883.2 884.1 0.9 Q 12,2092 60 316 3.2 886.0 886.0 886.2 0.2

1Feet above above mouth at Blowers Creek. See 2011 Black Hawk County stream profile, reprinted on profile sheets 2This portion of Maywood Branch redelineated, and distance references feet above confluence with Blowers Creek

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: MAYWOOD BRANCH AND INCORPORATED AREAS

A 8,013 450 3,444 2.9 821.8 821.52 822.3 0.8 B 10,184 500 3,244 3.1 823.8 823.8 824.7 0.9 C 12,679 450 3,301 3.0 827.0 827.0 827.8 0.8

1Feet above confluence with Cedar River 2Elevations computed without consideration of backwater effects from Cedar River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: MILLER CREEK AND INCORPORATED AREAS

A 3,3561 1,200 11,484 0.5 828.4 825.63 826.2 0.6 B 5,1802 350 1,793 3.3 830.6 830.6 830.7 0.1 C 12,1902 327 1,191 4.9 842.7 842.7 843.1 0.4

1This portion of Poyner Creek redelineated, and distance references feet above confluence with Cedar River 2Feet above mouth at Cedar River. See 2011 Black Hawk County stream profile, reprinted on profile sheets 3Elevations computed without consideration of backwater effects from Cedar River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: POYNER CREEK AND INCORPORATED AREAS

A 4,137 80 588 11.2 869.0 869.0 869.0 0.0 B 4,852 173 1,358 4.8 871.9 871.9 872.9 1.0 C 4,962 130 1,280 5.1 872.4 872.4 872.9 0.5 D 5,320 592 5,765 1.1 873.0 873.0 873.9 0.9 E 6,335 422 3,318 2.0 873.2 873.2 874.2 1.0 F 7,168 495 2,394 2.7 873.3 873.3 874.3 1.0 G 7,597 540 2,275 2.9 873.5 873.5 874.5 1.0 H 8,010 558 2,183 3.0 874.3 874.3 874.9 0.6 I 8,742 721 2,212 3.0 875.9 875.9 876.4 0.5 J 9,484 780 2,915 2.3 876.6 876.6 877.6 1.0 K 9,542 895 3,125 2.1 878.1 878.1 878.5 0.4 L 9,701 1011 3,106 2.1 878.2 878.2 878.6 0.4 M 9,863 1070 4,475 1.5 878.3 878.3 878.8 0.5 N 10,030 1060 3,671 1.8 878.3 878.3 878.9 0.6 O 10,242 1146 4,082 1.6 878.4 878.4 879.1 0.7 P 12,890 763 1,351 4.8 880.2 880.2 881.2 1.0 Q 15,579 618 2,787 2.3 886.4 886.4 887.1 0.7 R 17,014 520 1,590 4.1 888.2 888.2 888.9 0.7 S 17,590 712 2,304 2.8 889.8 889.8 890.7 0.9 T 17,821 685 2,648 2.4 890.2 890.2 891.2 1.0

1Feet above confluence with Black Hawk Creek 2Elevations computed without consideration of backwater effects from Black Hawk Creek

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: PRESCOTTS CREEK AND INCORPORATED AREAS

A 6,0451 188 704 6.6 834.0 824.93 825.0 0.1 B 6,2801 258 2,502 1.8 834.1 830.03 830.8 0.8 C 7,8551 260 1,267 3.6 835.1 831.83 832.5 0.7 D 10,9501 285 1,034 4.5 837.5 837.5 838.5 1.0 E 11,9851 450 1,652 2.7 843.0 843.0 843.8 0.8 F 14,0201 356 1,326 3.3 844.6 844.6 845.6 1.0 G 14,7201 208 1,052 4.1 848.3 848.3 848.5 0.2 H 17,3601 910 2,689 1.6 851.0 851.0 851.7 0.7 I 18,4401 423 926 4.7 853.2 853.2 854.0 0.8 J 21,2062 274 1,152 3.7 859.9 859.9 860.9 1.0 K 21,9112 380 1,562 2.8 863.6 863.6 864.3 0.7 L 24,3582 308 993 3.6 868.4 868.4 869.2 0.8 M 25,0092 128 408 8.7 872.3 872.3 872.8 0.5 N 25,3842 220 592 6.0 877.3 877.3 877.6 0.3 O 26,0922 166 739 4.8 880.6 880.6 881.4 0.8 P 26,4732 275 1,780 2.0 882.1 882.1 882.7 0.6 Q 27,2052 345 1,415 2.5 883.4 883.4 884.0 0.6 R 29,3602 272 1,114 3.2 888.5 888.5 889.5 1.0 S 29,8292 226 1,891 1.3 894.3 894.3 895.0 0.7 T 30,1962 290 1,893 1.3 894.3 894.3 895.1 0.8 U 30,9732 219 1,340 1.9 898.0 898.0 898.0 0.0 V 31,7792 245 827 3.0 898.0 898.0 898.0 0.0 W 32,4162 96 387 5.2 899.1 899.1 899.3 0.2 X 32,7702 53 216 9.3 900.8 900.8 901.8 1.0 Y 33,3192 140 485 4.2 907.2 907.2 908.2 1.0 1Feet above in feet above mouth. See 2011 Black Hawk County stream profile, reprinted on profile sheets 2This portion of Sink Creek redelineated, and distance references feet above confluence with Cedar River 3Elevations computed without consideration of backwater effects from Cedar River Overflow

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: SINK CREEK AND INCORPORATED AREAS

A 137 62 560 8.6 867.0 865.32 865.4 0.1 B 445 45 320 15.1 867.0 865.32 865.3 0.0 C 1,887 358 752 6.4 871.4 871.4 871.4 0.0 D 2,215 100 702 6.9 873.7 873.7 873.7 0.0 E 2,655 206 879 5.5 875.4 875.4 875.5 0.1 F 4,420 171 964 5.0 883.4 883.4 883.5 0.1 G 5,017 220 1,111 4.3 885.5 885.5 885.7 0.2 H 7,310 121 776 6.2 888.4 888.4 888.8 0.4 I 8,118 134 916 5.3 890.2 890.2 890.6 0.4 J 9,283 86 510 6.6 892.6 892.6 892.8 0.2 K 10,276 125 637 5.3 895.4 895.4 895.7 0.3 L 11,934 674 5,882 0.7 905.3 905.3 905.3 0.0 M 14,764 476 862 4.6 906.8 906.8 906.8 0.0 N 16,686 515 1,404 2.8 912.0 912.0 912.0 0.0 O 17,858 241 981 4.0 914.1 914.1 914.1 0.0 P 21,054 317 1,104 3.6 921.1 921.1 921.2 0.1

1Feet above confluence with Dry Run Creek at Cedar Falls 2Elevations computed without consideration of backwater effects from Dry Run Creek at Cedar Falls

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: SOUTHWEST BRANCH DRY RUN CREEK AND INCORPORATED AREAS

A 2,6941 715 2,046 4.7 856.5 856.5 856.5 0.0 B 4,3211 459 1,676 6.5 856.5 856.5 851.0 0.3 C 4,9611 70 488 12.0 856.5 856.5 852.2 1.0 D 5,1901 169 1,223 6.0 856.5 856.5 855.9 0.6 E 5,6101 180 1,173 7.1 856.5 856.5 856.3 0.6 F 5,9581 56 442 13.4 856.5 856.5 856.3 0.0 G 6,1601 89 1,124 5.6 861.0 861.0 861.6 0.6 H 6,2241 150 1,615 5.0 861.0 861.0 861.8 0.8 I 6,3351 324 3,645 2.5 862.5 862.5 863.3 0.8 J 7,1871 830 7,066 1.1 862.6 862.6 863.4 0.8 K 7,8441 745 5,014 1.3 862.6 862.6 863.5 0.9 L 8,6721 517 3,201 2.5 862.6 862.6 863.6 1.0 M 9,1061 517 3,687 1.7 863.4 863.4 864.3 0.9 N 11,8131 144 547 10.2 865.9 865.9 866.2 0.3 O 13,0031 373 1,852 2.8 869.3 869.3 870.2 0.9 P 14,1281 260 747 7.0 870.9 870.9 871.3 0.4 Q 14,2281 365 2,266 2.3 871.8 871.8 872.8 1.0 R 15,3781 509 2,796 1.9 872.1 872.1 873.1 1.0 S 15,5281 620 3,311 1.6 872.8 872.8 873.5 0.7 T 16,3131 651 3,129 1.7 872.9 872.9 873.7 0.8 U 20,9902 329 1,236 3.5 873.5 873.5 874.3 0.8

1Feet above mouth at Cedar River. See 2011 Black Hawk County stream profile, reprinted on profile sheets 2This portion of Stream No. 13 redelineated, and distance references feet above confluence with Cedar River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA

FLOODING SOURCE: STREAM NO. 13 AND INCORPORATED AREAS

A 10,0151 898 4,791 1.4 863.4 863.4 864.4 1.0 B 10,9721 620 2,472 1.9 863.6 863.6 864.5 0.9 C 11,8131 295 852 4.8 863.9 863.9 864.7 0.8 D 12,7321 149 758 4.7 865.4 865.4 866.1 0.7 E 13,6421 102 685 5.2 867.0 867.0 867.3 0.3 F 14,5211 151 1,020 4.0 867.8 867.8 868.4 0.6 G 14,7961 151 1,036 3.8 868.5 868.5 869.0 0.5 H 15,8381 410 1,714 2.7 869.1 869.1 869.5 0.4 I 16,8171 620 2,559 1.8 869.3 869.3 869.7 0.4 J 8,3472 607 2,137 2.2 869.3 869.3 869.9 0.6 K 9,5752 201 791 5.2 869.3 869.3 870.3 1.0 L 10,1902 195 901 5.1 870.4 870.4 871.2 0.8

1Feet above Stream No. 13 mouth at Cedar River. See 2011 Black Hawk County stream profile, reprinted on profile sheets 2This portion of Stream No. 36 redelineated, and distance references feet above confluence with Stream No. 13

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: STREAM NO. 36 AND INCORPORATED AREAS

A 600 256 750 1.1 869.3 869.3 870.1 0.8 B 1,280 138 181 4.5 870.1 870.1 870.4 0.3 C 1,760 217 558 1.5 871.5 871.5 872.0 0.5 D 3,480 201 253 3.2 872.9 872.9 873.6 0.7 E 3,680 65 305 2.7 875.8 875.8 876.8 1.0

1Feet above mouth at Stream No. 13

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: STREAM NO. 37 AND INCORPORATED AREAS

A 300 283 634 2.5 873.1 871.82 872.8 1.0 B 1,460 156 420 3.8 874.9 874.9 875.9 1.0 C 2,100 218 503 3.1 876.9 876.9 877.8 0.9 D 2,301 300 836 1.9 879.0 879.0 879.4 0.4

1Feet above mouth at Stream No. 13 2Elevations computed without consideration of backwater effects from Stream No. 13

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA

FLOODING SOURCE: STREAM NO. 39 AND INCORPORATED AREAS

A 7601 172 280 3.1 848.7 848.7 848.8 0.1 B 1,5751 46 103 8.5 854.4 854.4 854.4 0.0 C 2,9061 164 484 2.5 857.9 857.9 858.0 0.1 D 3,3781 134 330 5.1 858.1 858.1 858.2 0.1 E 3,4641 200 749 1.3 859.8 859.8 860.2 0.4 F 4,2881 560 1,342 1.1 859.9 859.9 860.3 0.4 G 4,7441 278 288 6.2 860.2 860.2 860.7 0.5 H 4,9291 256 744 1.6 860.7 860.7 861.2 0.5 I 5,2911 200 997 1.0 860.8 860.8 861.2 0.4 J 5,9101 95 229 5.5 860.4 860.4 861.2 0.8 K 6,2161 58 273 3.5 864.0 864.0 864.0 0.0 L 6,3051 72 345 3.1 864.0 864.0 864.2 0.2 M 6,3931 110 640 2.4 864.0 864.0 864.3 0.3 N 6,5941 110 502 3.2 865.0 865.0 865.2 0.2 O 6,7222 85 300 6.4 865.0 865.0 865.2 0.2 P 7,4892 90 251 6.5 867.4 867.4 867.8 0.4 Q 8,1992 160 401 7.6 870.6 870.6 871.4 0.8 R 8,5052 150 357 9.7 873.9 873.9 873.9 0.0 S 8,6172 190 460 15.1 874.2 874.2 874.2 0.0 T 8,7102 240 707 5.1 877.7 877.7 878.0 0.3 U 8,7782 185 586 4.5 877.8 877.8 878.1 0.3

1Feet above mouth at Black Hawk Creek. See 2011 Black Hawk County stream profile, reprinted on profile sheets 2This portion of Sunnyside Creek redelineated, and distance references feet above confluence with Black Hawk Creek

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: SUNNYSIDE CREEK AND INCORPORATED AREAS

100

A 601 76 501 3.3 863.8 862.22 862.7 0.5 B 855 69 154 10.6 863.9 862.22 862.7 0.5 C 1,033 27 179 9.1 863.7 863.62 864.2 0.6 D 1,403 151 1,161 1.4 866.8 866.8 867.4 0.6 E 1,720 99 414 3.9 866.9 866.9 867.4 0.5 F 2,230 34 149 10.9 867.8 867.8 867.8 0.0 G 2,774 52 137 10.0 873.0 873.0 873.7 0.7 H 3,197 23 200 6.9 876.0 876.0 877.0 1.0 I 3,342 73 247 5.6 876.9 876.9 877.7 0.8 J 4,184 48 217 6.3 880.5 880.5 880.5 0.0 K 4,745 90 358 3.8 884.2 884.2 884.7 0.5 L 5,046 19 119 11.5 884.2 884.2 884.7 0.5 M 5,769 68 286 4.8 888.3 888.3 888.7 0.4 N 6,003 72 321 4.2 889.9 889.9 890.4 0.5 O 6,715 33 158 8.1 891.4 891.4 891.5 0.1 P 9,505 78 237 5.9 904.1 904.1 904.5 0.4 Q 13,942 68 290 3.8 930.2 930.2 930.2 0.0 R 16,973 62 100 3.3 952.3 952.3 952.7 0.4

1Feet above confluence with Dry Run Creek at Cedar Falls 2Elevations computed without consideration of flooding controlled by effects from Dry Run Creek at Cedar Falls

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: UNIVERSITY BRANCH DRY RUN CREEK AND INCORPORATED AREAS

101

A 565 160 1,169 2.1 886.9 886.9 886.9 0.0 B 1,145 111 1,169 9.4 888.8 888.8 888.8 0.0 C 1,722 85 211 10.0 894.8 894.8 894.8 0.0 D 2,407 155 658 2.2 901.5 901.5 901.6 0.1 E 3,029 64 138 8.9 902.3 902.3 902.3 0.0 F 3,692 58 164 8.2 911.4 911.4 911.5 0.1 I 5,223 60 140 7.5 932.9 932.9 932.9 0.0 J 5,636 144 285 2.4 946.9 946.9 946.9 0.0 K 5,945 70 89 7.2 947.5 947.5 947.5 0.0 L 6,151 75 155 4.1 950.0 950.0 950.4 0.4 M 6,354 70 115 4.7 951.7 951.7 951.9 0.2

1Feet above Clayton Ulrich Dam

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA FLOODING SOURCE: UNNAMED TRIBUTARY TO CEDAR RIVER AND INCORPORATED AREAS

102

A 150 168 537 3.1 881.5 881.5 882.1 0.6 B 731 235 1,083 1.5 885.4 885.4 886.3 0.9 C 1,277 50 162 10.2 886.7 886.7 886.7 0.0 D 1,726 45 271 5.8 890.4 890.4 890.7 0.3 E 1,926 50 297 5.3 890.9 890.9 891.4 0.5 F 2,407 42 176 8.6 892.4 892.4 892.4 0.0 G 2,900 107 197 6.2 894.4 894.4 894.4 0.0 H 3,210 64 358 4.1 894.6 894.6 894.6 0.0

1Feet above confluence with Dry Run Creek at Cedar Falls

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA

FLOODING SOURCE: UNNAMED TRIBUTARY TO DRY RUN CREEK AND INCORPORATED AREAS

103

A 581 130 769 3.1 855.2 855.2 855.2 0.0 B 7681 125 582 4.3 855.2 855.2 855.2 0.0 C 9601 130 848 2.9 858.7 858.7 858.7 0.0 D 1,6501 140 656 4.0 858.7 858.7 858.7 0.0 E 3,0501 251 1,811 1.9 861.4 861.4 862.2 0.8 F 3,8951 399 2,147 1.6 861.7 861.7 862.4 0.7 G 4,2301 877 2,264 1.5 861.8 861.8 862.5 0.7 H 4,6391 650 2,227 1.5 862.1 862.1 862.6 0.5 I 5,1641 148 529 6.4 862.0 862.0 862.6 0.6 J 5,3791 120 395 8.5 863.2 863.2 863.2 0.0 K 5,6491 190 997 3.4 864.6 864.6 865.4 0.8 L 5,7441 235 1,118 3.0 864.9 864.9 865.7 0.8 M 5,9091 308 1,393 2.4 865.1 865.1 865.8 0.7 N 6,1391 460 1,634 2.1 865.3 865.3 865.9 0.6 O 6,2891 416 1,870 1.8 866.7 866.7 866.9 0.2 P 6,7991 162 1,111 3.0 866.8 866.8 867.0 0.2 Q 7,3541 257 1,363 2.5 867.0 867.0 867.3 0.3 R 7,9541 175 897 3.8 867.2 867.2 867.6 0.4 S 9,2002 293 1,262 2.7 867.6 867.6 868.6 1.0 T 10,0092 137 542 6.2 868.5 868.5 869.3 0.8

1Feet above culvert inlet. See 2011 Black Hawk County stream profile, reprinted on profile sheets 2This portion of Virden Creek redelineated, and distance references feet above confluence culvert inlet

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA

FLOODING SOURCE: VIRDEN CREEK AND INCORPORATED AREAS

104

A 1,796 184 655 1.8 871.9 870.12 871.1 1.0 B 2,871 180 215 5.3 876.6 876.6 877.1 0.5 C 3,087 150 700 1.6 879.7 879.7 880.1 0.4 D 4,443 87 153 7.5 881.7 881.7 882.7 1.0 E 5,768 236 441 2.6 893.3 893.3 893.6 0.3 F 7,402 61 172 6.7 899.3 899.3 899.9 0.6 G 8,457 121 329 3.5 905.0 905.0 905.9 0.9 H 8,703 160 724 1.6 908.1 908.1 908.9 0.8

1Feet above confluence with Virden Creek 2Elevation computed without consideration of backwater effects from Virden Creek

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA

FLOODING SOURCE: VIRDEN CREEK TRIBUTARY AND INCORPORATED AREAS

105

A 453 280 1,305 1.5 894.4 894.4 895.4 1.0 B 2,092 90 254 7.5 899.1 899.1 899.5 0.4 C 3,397 233 922 2.1 902.3 902.3 903.3 1.0 D 4,738 36 168 11.3 905.0 905.0 906.0 1.0 E 7,283 317 1,152 1.6 911.5 911.5 912.5 1.0 F 9,634 120 278 6.8 921.5 921.5 921.5 0.0 G 9,899 92 579 2.9 924.4 924.4 925.2 0.8 H 11,694 110 261 6.4 928.7 928.7 929.2 0.5 I 11,924 150 1,173 1.4 934.4 934.4 935.4 1.0

1Feet above confluence with Southwest Branch Dry Run Creek

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA

FLOODING SOURCE: WEST BRANCH DRY RUN CREEK AND INCORPORATED AREAS

106

A 5,961 2,000 27,243 2.5 880.8 880.8 881.7 0.9 B 7,342 1,800 23,939 2.9 881.7 881.7 882.6 0.9 C 12,107 1,599 21,043 1.7 883.4 883.4 884.3 0.9 D 28,204 1,400 4,965 4.3 888.5 888.5 889.0 0.5 E 33,812 1,442 22,066 1.6 890.4 890.4 891.4 1.0

1Feet above confluence with Cedar River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA

FLOODING SOURCE: WEST FORK CEDAR RIVER AND INCORPORATED AREAS

107

A 20,058 1,570 8,168 2.3 814.5 813.72 814.5 0.8 B 21,350 1,522 9,341 2.0 815.4 815.4 815.9 0.5 C 23,178 1,692 8,032 2.3 816.5 816.5 817.2 0.7 D 24,037 1,372 10,244 1.8 818.1 818.1 818.6 0.5 E 24,285 1,301 7,729 2.4 819.1 819.1 819.4 0.3 F 24,798 929 5,834 3.2 819.4 819.4 819.9 0.5 G 25,831 280 2,233 8.3 820.4 820.4 820.9 0.5 H 26,393 240 3,323 5.6 821.3 821.3 821.8 0.5 I 26,799 441 5,363 3.5 822.7 822.7 822.9 0.2 J 27,858 679 8,062 2.3 823.1 823.1 823.7 0.6 K 30,458 766 7,806 2.4 823.5 823.5 824.4 0.9 L 31,388 489 5,706 3.2 823.8 823.8 824.7 0.9 M 32,010 521 5,650 3.3 824.5 824.5 825.1 0.6

1Feet above confluence with Cedar River 2Elevations computed without consideration of backwater effects from Cedar River

TABLE 24TABLE FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA BLACK HAWK COUNTY, IOWA

FLOODING SOURCE: WOLF CREEK AND INCORPORATED AREAS

108

Table 25: Flood Hazard and Non-Encroachment Data for Selected Streams [Not Applicable to this Flood Risk Project]

6.4 Coastal Flood Hazard Mapping This section is not applicable to this Flood Risk Project.

Table 26: Summary of Coastal Transect Mapping Considerations [Not Applicable to this Flood Risk Project]

6.5 FIRM Revisions This FIS Report and the FIRM are based on the most up-to-date information available to FEMA at the time of its publication; however, flood hazard conditions change over time. Communities or private parties may request flood map revisions at any time. Certain types of requests require submission of supporting data. FEMA may also initiate a revision. Revisions may take several forms, including Letters of Map Amendment (LOMAs), Letters of Map Revision Based on Fill (LOMR-Fs), Letters of Map Revision (LOMRs) (referred to collectively as Letters of Map Change (LOMCs)), Physical Map Revisions (PMRs), and FEMA-contracted restudies. These types of revisions are further described below. Some of these types of revisions do not result in the republishing of the FIS Report. To assure that any user is aware of all revisions, it is advisable to contact the community repository of flood-hazard data (shown in Table , “Map Repositories”).

6.5.1 Letters of Map Amendment A LOMA is an official revision by letter to an effective NFIP map. A LOMA results from an administrative process that involves the review of scientific or technical data submitted by the owner or lessee of property who believes the property has incorrectly been included in a designated SFHA. A LOMA amends the currently effective FEMA map and establishes that a specific property is not located in a SFHA.

To obtain an application for a LOMA, visit www.fema.gov/floodplain-management/letter- map-amendment-loma and download the form “MT-1 Application Forms and Instructions for Conditional and Final Letters of Map Amendment and Letters of Map Revision Based on Fill”. Visit the “Flood Map-Related Fees” section to determine the cost, if any, of applying for a LOMA.

FEMA offers a tutorial on how to apply for a LOMA. The LOMA Tutorial Series can be accessed at www.fema.gov/online-tutorials.

For more information about how to apply for a LOMA, call the FEMA Map Information eXchange; toll free, at 1-877-FEMA MAP (1-877-336-2627).

6.5.2 Letters of Map Revision Based on Fill A LOMR-F is an official revision by letter to an effective NFIP map. A LOMR-F states FEMA’s determination concerning whether a structure or parcel has been elevated on fill above the base flood elevation and is, therefore, excluded from the SFHA.

109

Information about obtaining an application for a LOMR-F can be obtained in the same manner as that for a LOMA, by visiting www.fema.gov/floodplain-management/letter- map-amendment-loma for the “MT-1 Application Forms and Instructions for Conditional and Final Letters of Map Amendment and Letters of Map Revision Based on Fill” or by calling the FEMA Map Information eXchange, toll free, at 1-877-FEMA MAP (1-877-336- 2627). Fees for applying for a LOMR-F, if any, are listed in the “Flood Map-Related Fees” section.

A tutorial for LOMR-F is available at www.fema.gov/online-tutorials.

6.5.3 Letters of Map Revision A LOMR is an official revision to the currently effective FEMA map. It is used to change flood zones, floodplain and floodway delineations, flood elevations and planimetric features. All requests for LOMRs should be made to FEMA through the chief executive officer of the community, since it is the community that must adopt any changes and revisions to the map. If the request for a LOMR is not submitted through the chief executive officer of the community, evidence must be submitted that the community has been notified of the request.

To obtain an application for a LOMR, visit www.fema.gov/media- library/assets/documents/1343 and download the form “MT-2 Application Forms and Instructions for Conditional Letters of Map Revision and Letters of Map Revision”. Visit the “Flood Map-Related Fees” section to determine the cost of applying for a LOMR. For more information about how to apply for a LOMR, call the FEMA Map Information eXchange; toll free, at 1-877-FEMA MAP (1-877-336-2627) to speak to a Map Specialist.

Previously issued mappable LOMCs (including LOMRs) that have been incorporated into the Black Hawk County FIRM are listed in Table 27. Please note that this table only includes LOMCs that have been issued on the FIRM panels updated by this map revision. For all other areas within this county, users should be aware that revisions to the FIS Report made by prior LOMRs may not be reflected herein and users will need to continue to use the previously issued LOMRs to obtain the most current data.

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Table 27: Incorporated Letters of Map Change

Case Number Effective Date Flooding Source FIRM Panel(s) Tributary 1 12-07-1218P 04-12-2012 Unnamed Stream 19013C0281F

Dry Run Creek Tributary 1 Dry Run Creek Tributary 2 Unnamed Tributary to Dry 19013C0161F Run Creek 19013C0163F University Branch Dry Run 19013C0164F 12-07-2641P 05-31-2013 Creek 19013C0168F th 12 Street Detention Basin 19013C0277F Pointe West Detention Basin 19013C0281F Norwest University Branch Tributary University Branch Dry Run 13-07-0495P 03-18-2014 19013C0163F Creek 19013C0458F 13-07-2313P 06-26-2014 Cedar River 19013C0460F Cedar River Diversion 13-07-2387P 07-15-2015 19013C0166F Channel

6.5.4 Physical Map Revisions A Physical Map Revisions (PMR) is an official republication of a community’s NFIP map to effect changes to base flood elevations, floodplain boundary delineations, regulatory floodways and planimetric features. These changes typically occur as a result of structural works or improvements, annexations resulting in additional flood hazard areas or correction to base flood elevations or SFHAs.

The community’s chief executive officer must submit scientific and technical data to FEMA to support the request for a PMR. The data will be analyzed and the map will be revised if warranted. The community is provided with copies of the revised information and is afforded a review period. When the base flood elevations are changed, a 90-day appeal period is provided. A 6-month adoption period for formal approval of the revised map(s) is also provided.

For more information about the PMR process, please visit www.fema.gov and visit the “Flood Map Revision Processes” section.

6.5.5 Contracted Restudies The NFIP provides for a periodic review and restudy of flood hazards within a given community. FEMA accomplishes this through a national watershed-based mapping needs assessment strategy, known as the Coordinated Needs Management Strategy (CNMS). The CNMS is used by FEMA to assign priorities and allocate funding for new

111 flood hazard analyses used to update the FIS Report and FIRM. The goal of CNMS is to define the validity of the engineering study data within a mapped inventory. The CNMS is used to track the assessment process, document engineering gaps and their resolution, and aid in prioritization for using flood risk as a key factor for areas identified for flood map updates. Visit www.fema.gov to learn more about the CNMS or contact the FEMA Regional Office listed in Section 8 of this FIS Report.

6.5.6 Community Map History The current FIRM presents flooding information for the entire geographic area of Black Hawk County. Previously, separate FIRMs, Flood Hazard Boundary Maps (FHBMs) and/or Flood Boundary and Floodway Maps (FBFMs) may have been prepared for the incorporated communities and the unincorporated areas in the county that had identified SFHAs. Current and historical data relating to the maps prepared for the project area are presented in Table 28, “Community Map History.” A description of each of the column headings and the source of the date is also listed below.

 Community Name includes communities falling within the geographic area shown on the FIRM, including those that fall on the boundary line, nonparticipating communities, and communities with maps that have been rescinded. Communities with No Special Flood Hazards are indicated by a footnote. If all maps (FHBM, FBFM, and FIRM) were rescinded for a community, it is not listed in this table unless SFHAs have been identified in this community.

 Initial Identification Date (First NFIP Map Published) is the date of the first NFIP map that identified flood hazards in the community. If the FHBM has been converted to a FIRM, the initial FHBM date is shown. If the community has never been mapped, the upcoming effective date or “pending” (for Preliminary FIS Reports) is shown. If the community is listed in Table 28 but not identified on the map, the community is treated as if it were unmapped.

 Initial FHBM Effective Date is the effective date of the first FHBM. This date may be the same date as the Initial NFIP Map Date.

 FHBM Revision Date(s) is the date(s) that the FHBM was revised, if applicable.

 Initial FIRM Effective Date is the date of the first effective FIRM for the community.

 FIRM Revision Date(s) is the date(s) the FIRM was revised, if applicable. This is the revised date that is shown on the FIRM panel, if applicable. As countywide studies are completed or revised, each community listed should have its FIRM dates updated accordingly to reflect the date of the countywide study. Once the FIRMs exist in countywide format, as PMRs of FIRM panels within the county are completed, the FIRM Revision Dates in the table for each community affected by the PMR are updated with the date of the PMR, even if the PMR did not revise all the panels within that community.

The initial effective date for the Black Hawk County FIRMs in countywide format was 07/18/2011.

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Table 28: Community Map History

Initial Initial FHBM FHBM Initial FIRM FIRM Identification Effective Revision Effective Revision Community Name Date Date Date(s) Date Date(s) Black Hawk County, 10/25/1977 10/25/1977 N/A 11/17/1982 7/18/2011 Unincorporated Areas Cedar Falls, City of 04/12/1974 04/12/1974 09/12/1975 02/01/1985 7/18/2011 Dunkerton, City of 03/22/1974 03/22/1974 02/27/1976 01/16/1980 7/18/2011 Elk Run Heights, City of 01/16/1974 01/16/1974 04/16/1976 08/01/1983 7/18/2011 04/16/1993 Evansdale, City of 05/17/1974 05/17/1974 9/19/1975 11/02/1977 7/18/2011

Gilbertville, City of 03/22/1974 03/22/1974 02/06/1976 08/01/1978 7/18/2011

Hudson, City of 03/08/1974 03/08/1974 06/25/1976 01/16/1980 7/18/2011

03/16/2004 La Porte City, City of 12/06/1974 12/06/1974 N/A 01/02/1981 7/18/2011

Raymond, City of 03/22/1974 03/22/1974 01/16/1976 07/11/1978 7/18/2011

06/05/1984 05/06/1980 Waterloo, City of 06/28/1974 06/28/1974 07/03/1985 7/18/2011 09/13/1977 09/19/1975

SECTION 7.0 – CONTRACTED STUDIES AND COMMUNITY COORDINATION

7.1 Contracted Studies Table 29 provides a summary of the contracted studies, by flooding source, that are included in this FIS Report.

Table 29: Summary of Contracted Studies Included in this FIS Report

Work Flooding FIS Report Completed Affected Source Dated Contractor Number Date Communities Black Hawk County, ESD7385SR February Unincorporated Beaver Creak TBD IIHR ALST100332 2016 Areas; Cedar Falls, City of Black & EMK-2001- Black Hawk County, Big Woods Veatch, HR CO-0001 and Unincorporated 07/18/2011 2007 Creek Green, and EMW-1999- Areas; Cedar Falls, Earth Tech CO-0509 City of

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Table 29: Summary of Contracted Studies Included in this FIS Report (continued)

Work Flooding FIS Report Completed Affected Source Dated Contractor Number Date Communities

Black & EMK-2001- Black Hawk Big Woods Veatch, HR CO-0001 and County, Creek Upper 07/18/2011 2007 Green, and EMW-1999- Division Unincorporated Earth Tech CO-0509 Areas Black Hawk Black & County, Black Hawk Veatch, HR EMK-2001- Unincorporated 07/18/2011 2007 Creek Green, and CO-2019 Areas; Hudson, Earth Tech City of; Waterloo, City of DeWild Grant Reckert and February Blowers Creek 01/03/1985 H-3806 Waterloo, City of Associates 1980 Company Black Hawk County, Black & EMK-2001- Unincorporated Veatch, HR CO-0001 and Areas; Cedar Falls, Cedar River 07/18/2011 2007 Green, and EMW-1999- City of; Evansdale, Earth Tech CO-0509 City of; Waterloo, City of Black & EMK-2001- Cedar River Veatch, HR CO-0001 and Cedar Falls, City of; Diversion 07/18/2011 2007 Green, and EMW-1999- Waterloo, City of Channel Earth Tech CO-0509 Stanley City View February 01/03/1985 Consultants, H-4005 Waterloo, City of Branch 1980 Inc. Black & EMK-2001- Black Hawk County, Veatch, HR CO-0001 and Unincorporated Crane Creek 07/18/2011 2007 Green, and EMW-1999- Areas; Dunkerton, Earth Tech CO-0509 City of Black & EMK-2001- Crossroads Veatch, HR CO-0001 and 07/18/2011 2007 Waterloo, City of Creek Green, and EMW-1999- Earth Tech CO-0509 Black & EMK-2001- Dry Run Veatch, HR CO-0001 and Creek at 07/18/2011 2007 Cedar Falls, City of Green, and EMW-1999- Cedar Falls Earth Tech CO-0509

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Table 29: Summary of Contracted Studies Included in this FIS Report (continued)

Work Flooding FIS Report Completed Affected Source Dated Contractor Number Date Communities Black & EMK-2001- Dry Run Veatch, HR CO-0001 and Creek at 07/18/2011 2007 Waterloo, City of Green, and EMW-1999- Waterloo Earth Tech CO-0509 Dry Run Black & EMK-2001- Creek Veatch, HR CO-0001 and 07/18/2011 2007 Cedar Falls, City of Diversion Green, and EMW-1999- Channel Earth Tech CO-0509 Dry Creek January Run Tributary TBD * * 2013 Cedar Falls, City of 1 Dry Creek January Run Tributary TBD * * 2013 Cedar Falls, City of 2 Black Hawk County, DeWild Grant Unincorporated Reckert and Elk Run Creek 05/17/1982 H-3806 June 1980 Areas; Elk Run Associates Heights, City of; Company Evansdale, City of Stanley Maywood February 01/03/1985 Consultants, H-4005 Waterloo, City of Branch 1980 Inc. DeWild Grant Black Hawk County, Reckert and Miller Creek 05/17/1982 H-3806 June 1980 Unincorporated Associates Areas Company Northeast University January TBD * * Cedar Falls, City of Branch 2013 Tributary Northwest University January TBD * * Cedar Falls, City of Branch 2013 Tributary DeWild Grant Black Hawk County, Reckert and Poyner Creek 05/17/1982 H-3806 June 1980 Unincorporated Associates Areas Company Black Hawk County, Stanley Prescotts February Unincorporated 01/03/1985 Consultants, H-4005 Creek 1980 Areas; Waterloo, City Inc. of

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Table 29: Summary of Contracted Studies Included in this FIS Report (continued)

Work Flooding FIS Report Completed Affected Source Dated Contractor Number Date Communities Black Hawk County, Stanley February Unincorporated Sink Creek 01/03/1985 Consultants, H-4005 1980 Areas; Waterloo, City Inc. of Black & EMK-2001- Black Hawk County, Southwest Veatch, HR CO-0001 and Unincorporated Branch Dry 07/18/2011 2007 Green, and EMW-1999- Areas; Cedar Falls, Run Creek Earth Tech CO-0509 City of Black Hawk County, Spring Creek TBD * * 2007 Unincorporated Areas Black & EMK-2001- Black Hawk County, Veatch, HR CO-0001 and Unincorporated Stream No. 13 07/18/2011 2007 Green, and EMW-1999- Areas; Waterloo, City Earth Tech CO-0509 of Black & EMK-2001- Black Hawk County, Veatch, HR CO-0001 and Unincorporated Stream No. 36 07/18/2011 2007 Green, and EMW-1999- Areas; Waterloo, City Earth Tech CO-0509 of Stanley February Stream No. 39 01/03/1985 Consultants, H-4005 Waterloo, City of 1980 Inc. Black & EMK-2001- Sunnyside Veatch, HR CO-0001 and 07/18/2011 2007 Waterloo, City of Creek Green, and EMW-1999- Earth Tech CO-0509 Black & EMK-2001- Sunnyside Veatch, HR CO-0001 and 07/18/2011 2007 Waterloo, City of Creek Bypass Green, and EMW-1999- Earth Tech CO-0509 Tributary 1 TBD * * April 2012 Cedar Falls, City of University Stanley Branch Dry 08/01/1984 Consultants, H-4005 July 1981 Cedar Falls, City of Run Creek Inc. Unnamed TBD * * April 2012 Cedar Falls, City of Stream Unnamed Stanley Tributary to 08/01/1984 Consultants, H-4005 July 1981 Cedar Falls, City of Cedar River Inc. Unnamed Tributary to January TBD * * Cedar Falls, City of Dry Run 2013 Creek

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Table 29: Summary of Contracted Studies Included in this FIS Report (continued)

Work Flooding FIS Report Completed Affected Source Dated Contractor Number Date Communities Black Hawk County, Stanley February Unincorporated Virden Creek 01/03/1985 Consultants, H-4005 1980 Areas; Waterloo, City Inc. of Black Hawk County, Stanley Virden Creek February Unincorporated 01/03/1985 Consultants, H-4005 Tributary 1980 Areas; Waterloo, City Inc. of Black Hawk County, West Branch Stanley Unincorporated Dry Run 08/01/1984 Consultants, H-4005 July 1981 Areas; Cedar Falls, Creek Inc. City of DeWild Grant Black Hawk County, West Fork Reckert and 05/17/1982 H-3806 June 1980 Unincorporated Cedar River Associates Areas Company Black Hawk County, Black & EMW-1999- Unincorporated Wolf Creek 03/16/2004 July 2002 Veatch CO-0509 Areas; La Porte, City of Black Hawk County, Wolf Creek Black & EMW-1999- Unincorporated 03/16/2004 July 2002 Overflow Veatch CO-0509 Areas; La Porte, City of Black Hawk County, Unincorporated Areas; Cedar Falls, City of; Dunkerton, Zone A City of; Elk Run ESD7385SR February Flooding TBD IIHR Heights, City of; ALST100332 2016 Sources Gilbertville, City of Hudson, City of; La Porte, City of; Raymond, City of; Waterloo, City of Black Hawk County, Unincorporated Black & EMK-2001- Zone A Areas; Elk Run Veatch, HR CO-0001 and Flooding 06/18/2011 2007 Heights, City of; Green, and EMW-1999- Sources Evansdale, City of; Earth Tech CO-0509 Raymond, City of; Waterloo, City of *Data not available

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7.2 Community Meetings The dates of the community meetings held for this Flood Risk Project and previous Flood Risk Projects are shown in Table 30. These meetings may have previously been referred to by a variety of names (Community Coordination Officer (CCO), Scoping, Discovery, etc.), but all meetings represent opportunities for FEMA, community officials, study contractors, and other invited guests to discuss the planning for and results of the project.

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Table 30: Community Meetings

FIS Report Community Dated Date of Meeting Meeting Type Attended By DFHP Review FEMA, BHC EMA, IDNR, INRCOG, Stantec, and the Black Hawk County, 05/11/2017 TBD Meeting community Unincorporated Areas TBD CCO Meeting FEMA, the community, and the study contractor DFHP Review FEMA, BHC EMA, IDNR, INRCOG, Stantec, and the 05/11/2017 Cedar Falls, City of TBD Meeting community TBD CCO Meeting FEMA, the community, and the study contractor DFHP Review FEMA, BHC EMA, IDNR, INRCOG, Stantec, and the 05/11/2017 Dunkerton, City of TBD Meeting community TBD CCO Meeting FEMA, the community, and the study contractor DFHP Review 05/11/2017 FEMA, BHC EMA, IDNR, INRCOG, and Stantec Elk Run Heights, City of TBD Meeting TBD CCO Meeting FEMA, the community, and the study contractor DFHP Review FEMA, BHC EMA, IDNR, INRCOG, Stantec, and the 05/11/2017 Evansdale, City of TBD Meeting community TBD CCO Meeting FEMA, the community, and the study contractor DFHP Review 05/11/2017 FEMA, BHC EMA, IDNR, INRCOG, and Stantec Gilbertville, City of TBD Meeting TBD CCO Meeting FEMA, the community, and the study contractor DFHP Review FEMA, BHC EMA, IDNR, INRCOG, Stantec, and the 05/11/2017 Hudson, City of TBD Meeting community TBD CCO Meeting FEMA, the community, and the study contractor DFHP Review 05/11/2017 FEMA, BHC EMA, IDNR, INRCOG, and Stantec La Porte City, City of TBD Meeting TBD CCO Meeting FEMA, the community, and the study contractor

119

Table 30: Community Meetings (continued)

FIS Report Community Dated Date of Meeting Meeting Type Attended By DFHP Review 05/11/2017 FEMA, BHC EMA, IDNR, INRCOG, and Stantec Raymond, City of TBD Meeting TBD CCO Meeting FEMA, the community, and the study contractor DFHP Review 05/11/2017 FEMA, BHC EMA, IDNR, INRCOG, and Stantec Waterloo, City of TBD Meeting TBD CCO Meeting FEMA, the community, and the study contractor

120

SECTION 8.0 – ADDITIONAL INFORMATION

Information concerning the pertinent data used in the preparation of this FIS Report can be obtained by submitting an order with any required payment to the FEMA Engineering Library. For more information on this process, see www.fema.gov.

The additional data that was used for this project includes the FIS Report and FIRM that were previously prepared for Black Hawk County (FEMA 2011).

Table is a list of the locations where FIRMs for Black Hawk County can be viewed. Please note that the maps at these locations are for reference only and are not for distribution. Also, please note that only the maps for the community listed in the table are available at that particular repository. A user may need to visit another repository to view maps from an adjacent community.

Table 31: Map Repositories

Community Address City State Zip Code Black Hawk County Black Hawk County, Courthouse Waterloo IA 50703 Unincorporated Areas 316 East 5th Street Department of Finance and Cedar Falls, City of Business Operations Cedar Falls IA 50613 220 Clay Street City Hall Dunkerton, City of Dunkerton IA 50626 200 Tower Street City Hall Elk Run Elk Run Heights, City of IA 50707 5042 Lafayette Road Heights Business Office Evansdale, City of Evansdale IA 50707 123 North Evans Road City Hall Gilbertville, City of th Gilbertville IA 50634 1321 5 Street City Hall Hudson, City of Hudson IA 50643 525 Jefferson Street City Hall La Porte City, City of La Porte City IA 50651 202 Main Street City Hall Raymond, City of st Raymond IA 50667 101 1 Street City Hall Waterloo, City of Waterloo IA 50703 715 Mulberry Street

The National Flood Hazard Layer (NFHL) dataset is a compilation of effective FIRM Databases and LOMCs. Together they create a GIS data layer for a State or Territory. The NFHL is updated as studies become effective and extracts are made available to

121

the public monthly. NFHL data can be viewed or ordered from the website shown in Table . Table contains useful contact information regarding the FIS Report, the FIRM, and other relevant flood hazard and GIS data. In addition, information about the State NFIP Coordinator and GIS Coordinator is shown in this table. At the request of FEMA, each Governor has designated an agency of State or territorial government to coordinate that State's or territory's NFIP activities. These agencies often assist communities in developing and adopting necessary floodplain management measures. State GIS Coordinators are knowledgeable about the availability and location of State and local GIS data in their state.

Table 32: Additional Information

FEMA and the NFIP FEMA and FEMA www.fema.gov/national-flood-insurance-program-flood- Engineering Library website hazard-mapping/engineering-library NFIP website www.fema.gov/national-flood-insurance-program NFHL Dataset msc.fema.gov FEMA Region VII FEMA Region VII 11224 Holmes Road Kansas City, MO 64131 (816) 283-7003 Other Federal Agencies USGS website www.usgs.gov Hydraulic Engineering Center www.hec.usace.army.mil website State Agencies and Organizations State NFIP Coordinator Bill Cappuccio Iowa Dept. of Natural Resources Wallace State Office Building Des Moines, Iowa 50319 (515) 281-8942 [email protected] State GIS Coordinator Chris Ensminger Iowa Dept. of Natural Resources 502 E. 9th Street Des Moines, Iowa 50319 Phone: (515) 281-4216 [email protected]

SECTION 9.0 – BIBLIOGRAPHY AND REFERENCES

Table includes sources used in the preparation of and cited in this FIS Report as well as additional studies that have been conducted in the study area.

122

Table 33: Bibliography and References

Citation Publisher/ Publication Title, “Article,” Place of Publication Date/ in this FIS Issuer Volume, Number, etc. Author/Editor Publication Date of Issuance Link Aerial Services, Topographic Maps, Scale Inc. 1999, Aerial Services, 1:6,000, Contour Interval 2 1999, 2000,

2000, Inc. feet; Black Hawk County, 2002, and 2003 2002, and Iowa 2003 Brice, Petrides & City of Cedar Falls, Iowa, Brice, Petrides & Waterloo, Associates, Cedar River Profiles for I-380 Undated Associates, Inc. Iowa Inc. and F-518 Hydraulic Analysis undated Cedar Falls, Iowa, Dry Run Creek, Flood Control Study: Brice, Volume I General Basin Petrides & Brice, Petrides & Analysis, University Branch Waterloo, July and

Associates, Associates, Inc. Analysis; Volume II Iowa December 1980 Inc. 1980 Bergstrom Boulevard Branch Analysis, Southwest Branch Analysis Brice, Petrides & Cedar Falls, Iowa, Lakeview Associates, Brice, Petrides & Waterloo, Watershed, Flood Plain and November 1980 Inc. Associates, Inc. Iowa Floodway Study November 1980 Topographic Survey Maps, City of City of Waterloo, Waterloo, Iowa, Scale Waterloo, November 1966 Iowa 1:1,200, Contour Interval 2 Iowa 1966 feet

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Table 33: Bibliography and References (continued)

Citation Publisher/ Publication Title, “Article,” Place of Publication Date/ in this FIS Issuer Volume, Number, etc. Author/Editor Publication Date of Issuance Link Comprehensive Drainage Brice City of Study of Creeks in the City of Waterloo, Petrides and Waterloo, Waterloo, Waterloo Area – No Name May 1974 Iowa Associates, Iowa Iowa 1974 Creek, Sink Creek, Prescotts Inc. Creek Brice City of City of Waterloo, Flood Plain and Flood Control Petrides and Waterloo, Waterloo, May 1977 Iowa Study, Dry Run Creek Associates, Iowa Iowa 1977 Inc. Techniques for Estimating Flood Frequency Discharges Eash, D.A. for Streams in Iowa. Unites Eash, D.A. 2001 2001 States Geologic Survey Water Resources Investigation Report 00-4233. Elk Run Creek Storm Flood Elk Run Control Map, Scale 1:6,000, Heights Elk Run Heights 1981 Contour Interval One Foot; 1981 City of Elk Run Heights, Iowa Federal Emergency Flood Insurance Study, Black FEMA Flood Map Service FEMA Washington, Management Hawk County, Iowa, and 2011 Center 2011 D.C. Agency Unincorporated Areas msc.fema.gov Federal Emergency Flood Insurance Study, Black FEMA Flood Map Service FEMA Management Hawk County, November 1982 Center 1982 Agency Unincorporated Areas, Iowa msc.fema.gov “Time Distribution Huff, F.A. Characteristics of Rainfall Huff, F.A. April 1970 1970 Rates,” Water Resources Research, 6(2), 447-454

124

Table 33: Bibliography and References (continued)

Citation Publisher/ Publication Title, “Article,” Place of Publication Date/ in this FIS Issuer Volume, Number, etc. Author/Editor Publication Date of Issuance Link Iowa Geological IDNR 2010 and Water Survey, LiDAR Datasets 2010 DNR Method for Estimating the Magnitude and Frequency of Floods at Ungaged Sites on Lara, O.G. Unregulated Rural Streams in Lara, O.G. 1987 1987 Iowa. United States Geologic Survey Water Resources Investigation Report 87-4132. Nebraska NDNR Nebraska Flood Elevation Department of 2006 2006 Calculation Tools (N-FECT) Natural Resources U.S. Army Corps of HEC-2 Water-Surface USACE Engineers, Davis, December 1968 Profiles, Generalized 1968 Hydrologic California with updates Computer Program Engineering Center USACE U.S. Army Corps of Black Hawk Creek Flood December Engineers, Rock Plain Information, Black Hawk December 1968 1968 Island District County, Iowa U.S. Army Corps of Flood Plain Information USACE Engineers, Rock Report, Black Hawk County, June 1970 1970 Island District Iowa U.S. Army Corps of HEC-HMS, Hydrologic USACE Engineers, Davis, Modeling System, Version November 2002 2002 Hydrologic California 2.2.1 Engineering Center

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Table 33: Bibliography and References (continued)

Citation Publisher/ Publication Title, “Article,” Place of Publication Date/ in this FIS Issuer Volume, Number, etc. Author/Editor Publication Date of Issuance Link U.S. Army Corps of USACE Engineers, HEC-RAS Version 3.1.3 May 2005 2005 Hydrologic Engineering Center U.S. Department of National Engineering USDA Agriculture, Soil Washington, Handbook, Section 4, 1972 1972 Conservation D.C. “Hydrology” Service Technical Paper No. 40, U.S. Department of USDOC Rainfall Frequency Atlas of Washington, Commerce, 1961 1961 the United States, U.S. D.C. Weather Bureau Printing Office 7.5-Minute Series Topographic Maps, Scale USGS U.S. Geological 1:24,000, Contour Interval 10 1971-1972 topomaps.usgs.gov 1971-1972 Survey feet: Gilbertville, Iowa (1971) and Waterloo South, Iowa (1963, PR 1972). 7.5 Minute-Series USGS U.S. Geological Topographic Maps, Scale 1972 topomaps.usgs.gov 1972 Survey 1:24,000, Contour Interval 10 feet, photorevised 1972 U.S. Geological Bulletin No. 11, Floods in USGS Survey, Iowa Iowa: Technical Manual for Oscar G. March 1973 1973 Natural Resources Estimating Their Magnitude Lara Council and Frequency

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Table 33: Bibliography and References (continued)

Citation Publisher/ Publication Title, “Article,” Place of Publication Date/ in this FIS Issuer Volume, Number, etc. Author/Editor Publication Date of Issuance Link 7.5-Minute Series Topographic Maps, Scale USGS U.S. Geological 1:24,000, Contour Interval 10 Iowa City, 1976 topomaps.usgs.gov 1976 Survey feet: Waterloo South, Iowa Iowa (1963), and Gilbertville, Iowa (1971) Water-Resources Investigation Report 94-4002, Nationwide Summary of U.S. USGS U.S. Geological Geological Survey 1993 1993 Survey Regression Equations for Estimating Magnitude and Frequency of Floods for Ungaged Sites Bulletin No. 17A, Hydrology USWRC U.S. Water Committee, Guidelines for June 1977 with

1977 Resources Council Determining Flood Flow updates Frequency

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885 885 1% ANNUAL CHANCE BACKWATER EFFECT FROM CEDAR RIVER

880 880 RAILROAD FIELD ROAD FIELD ROAD 875 875 LONE TREE ROAD BIG WOODS ROAD BIG WOODS ROAD BIG WOODS ROAD DUNKERTON ROAD

870 870 BIG WOODS CREEK FLOOD PROFILES

865 865

860 860 ELEVATION IN (NAVDFEET 88)

855 855

850 850 LEGEND 0.2% ANNUAL CHANCE FLOOD

1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD* 845 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD BLACK IA HAWK, STREAM BED AND AREAS INCORPORATED A B C D E CROSS SECTION LOCATION

840 FEDERAL EMERGENCY MANAGEMENT AGENCY 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000

STREAM DISTANCE IN FEET FROM MOUTH 01P 940 940

930 930 LIMIT OF STUDY

920 920 BIG WOODS ROAD

910 910 BIG WOODS CREEK FLOOD PROFILES

900 900

890 890 ELEVATION IN (NAVDFEET 88)

880 880

870 870 LEGEND 0.2% ANNUAL CHANCE FLOOD

1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 860 4% ANNUAL CHANCE FLOOD* 10% ANNUAL CHANCE FLOOD BLACK IA HAWK, STREAM BED AND AREAS INCORPORATED F G H CROSS SECTION LOCATION

850 FEDERAL EMERGENCY MANAGEMENT AGENCY 24,000 25,000 26,000 27,000 28,000 29,000 30,000 31,000 32,000 33,000 34,000 35,000 36,000 37,000

STREAM DISTANCE IN IN FEET ABOVE MOUTH 02P 882 882

880 880

1% ANNUAL CHANCE BACKWATER EFFECT FROM BIG WOODS CREEK DIVERSION 878 878

LIMIT OF DETAILED STUDY DETAILED OF LIMIT UPPER PROFILES 876 876 CREEK

88) FLOOD

874 874 (NAVD WOODS

FEET IN BIG

872 872

ELEVATION

>— 870 870 0 Z 8 < 2’3 E$523 10% ANNUAL CHANCE FLOOD ”2J4-

STREAM BED mung_I < E CROSS SECTION LOCATION LIJ D LIJ 864 U. 400 800 1,200 1,600 2,000 2,400 2,800 3,200 3,600 4,000 4,400 4,800 5,200

STREAM DISTANCE IN FEET ABOVE STORAGE AREA FOR BIG WOODS CREEK 03P 04P 900 900

890 890

880 880 CREEK

PROFILES 870 870 HAWK

88) FLOOD BLACK

860 860 (NAVD

FEET IN

850 850

ELEVATION

840 840 IA AGENCY

AREAS 830 830 LEGEND COUNTY, 0.2% ANNUAL CHANCE FLOOD MANAGEMENT 1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 820 4% ANNUAL CHANCE FLOOD" HAWK 10% ANNUAL CHANCE FLOOD INCORPORATED EMERGENCY STREAM BED AND CROSS SECTION LOCATION BLACK 810 FEDERAL 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000 22,000 24,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CEDAR RIVER 05P 910 910

900 900

890 890 CREEK

PROFILES 880 880 HAWK

88) FLOOD BLACK

870 870 (NAVD

FEET IN

860 860

ELEVATION

850 850 IA AGENCY

AREAS 840 840 LEGEND COUNTY, 0.2% ANNUAL CHANCE FLOOD MANAGEMENT 1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 830 4% ANNUAL CHANCE FLOOD" HAWK 10% ANNUAL CHANCE FLOOD INCORPORATED EMERGENCY STREAM BED AND CROSS SECTION LOCATION BLACK 820 FEDERAL 24,000 26,000 28,000 30,000 32,000 34,000 36,000 38,000 40,000 42,000 44,000 46,000 48,000 50,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CEDAR RIVER 06P 920 920

910 910

900 900 CREEK

PROFILES 890 890 HAWK

88) FLOOD BLACK

880 880 (NAVD

FEET IN

870 870

ELEVATION

860 860 IA AGENCY

AREAS 850 850 LEGEND COUNTY, 0.2% ANNUAL CHANCE FLOOD MANAGEMENT 1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 840 4% ANNUAL CHANCE FLOOD" HAWK 10% ANNUAL CHANCE FLOOD INCORPORATED EMERGENCY STREAM BED AND CROSS SECTION LOCATION BLACK 830 FEDERAL 50,000 52,000 54,000 56,000 58,000 60,000 62,000 64,000 66,000 68,000 70,000 72,000 74,000 76,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CEDAR RIVER 07P 08P 950 950

940 940

930 LIMIT OF STUDY 930 STATE HIGHWAY T69/ Z AVE

920 920 FLOOD PROFILES BLACK HAWK CREEK

910 910

900 900 ELEVATION IN FEET (NAVD 88) IN FEET (NAVD ELEVATION

890 890

880 880 LEGEND 0.2% ANNUAL CHANCE FLOOD

1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 870 4% ANNUAL CHANCE FLOOD* 10% ANNUAL CHANCE FLOOD

STREAM BED AND INCORPORATED AREAS BK BL BM CROSS SECTION LOCATION BLACK HAWK COUNTY, IA

860 FEDERAL EMERGENCY MANAGEMENT AGENCY 102,000 104,000 106,000 108,000 110,000 112,000 114,000 116,000 118,000 120,000 122,000 124,000 126,000 128,000

STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CEDAR RIVER 09P 10P 11P 875 875

870 870

865 865

CREEK PROFILES 860 860

BLOWERS 88) FLOOD

855 855 (NAVD

FEET IN

850 850

ELEVATION

845 845 IA AGENCY

AREAS 840 840 LEGEND COUNTY, 0.2% ANNUAL CHANCE FLOOD MANAGEMENT 1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 835 4% ANNUAL CHANCE FLOOD" HAWK 10% ANNUAL CHANCE FLOOD INCORPORATED EMERGENCY STREAM BED AND CROSS SECTION LOCATION BLACK 830 FEDERAL 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 13,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CEDAR RIVER 12P 900 900

895 895

890 890

CREEK PROFILES 885 885

BLOWERS 88) FLOOD

880 880 (NAVD

FEET IN

875 875

ELEVATION

870 870 IA AGENCY

AREAS 865 865 LEGEND COUNTY, 0.2% ANNUAL CHANCE FLOOD MANAGEMENT 1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD

4% ANNUAL CHANCE FLOOD" 860 HAWK INCORPORATED 10% ANNUAL CHANCE FLOOD EMERGENCY STREAM BED AND CROSS SECTION LOCATION BLACK 855 FEDERAL 13,000 13,500 14,000 14,500 15,000 15,500 16,000 16,500 17,000 17,500 18,000 18,500 19,000 19,500

STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CEDAR RIVER 13P 850 850

840 840

830 LIMIT OF STUDY 830 COUNTY BOUNDARY COUNTY HIGHWAY D48 ABANDONED RAILROAD CONFLUENCE OF MUD CREEK CONFLUENCE OF ROCK CREEK CONFLUENCE OF WOLF CREEK CONFLUENCE OF SPRING CREEK

820 820 CEDAR RIVER FLOOD PROFILES

810 810

800 800 ELEVATION IN FEET (NAVD 88) IN FEET (NAVD ELEVATION

790 790

H I

780 780 LEGEND 0.2% ANNUAL CHANCE FLOOD

1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 770 4% ANNUAL CHANCE FLOOD* 10% ANNUAL CHANCE FLOOD

STREAM BED AND INCORPORATED AREAS A B C D E F G CROSS SECTION LOCATION BLACK HAWK COUNTY, IA

760 FEDERAL EMERGENCY MANAGEMENT AGENCY 134.0 135.0 136.0 137.0 138.0 139.0 140.0 141.0 142.0 143.0 144.0 145.0 146.0 147.0

STREAM DISTANCE IN MILES ABOVE CONFLUENCE WITH IOWA RIVER 14P 870 870

860 860 CONFLUENCE OF

850 CROSSROADS CREEK 850 ABANDONED RAILROAD EAST WASHBURN ROAD COUNTY HIGHWAY D38/ CONFLUENCE OF BLOWERS CREEK CONFLUENCE OF MILLER CREEK CONFLUENCE OF CONFLUENCE OF POYNER CREEK CONFLUENCE OF ELK RUN CREEK

840 840 CEDAR RIVER FLOOD PROFILES

830 830

820 820 ELEVATION IN FEET (NAVD 88) IN FEET (NAVD ELEVATION

810 810

800 800 LEGEND 0.2% ANNUAL CHANCE FLOOD

1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 790 4% ANNUAL CHANCE FLOOD* 10% ANNUAL CHANCE FLOOD

STREAM BED AND INCORPORATED AREAS J K L CROSS SECTION LOCATION BLACK HAWK COUNTY, IA

780 FEDERAL EMERGENCY MANAGEMENT AGENCY 147.0 148.0 149.0 150.0 151.0 152.0 153.0 154.0 155.0 156.0 157.0 158.0 159.0 160.0

STREAM DISTANCE IN MILES ABOVE CONFLUENCE WITH IOWA RIVER 15P 16P 17P 18P 900 900

890 890

880 880

RIVER PROFILES 870 870 CEDAR

88) FLOOD

860 860 (NAVD

FEET IN

850 850

ELEVATION

840 840 IA AGENCY

AREAS 830 830 LEGEND COUNTY, 0.2% ANNUAL CHANCE FLOOD MANAGEMENT 1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 820 4% ANNUAL CHANCE FLOOD" HAWK 10% ANNUAL CHANCE FLOOD INCORPORATED EMERGENCY STREAM BED AND CROSS SECTION LOCATION BLACK 810 FEDERAL 166.5 167.0 167.5 168.0 168.5 169.0 169.5 170.0 170.5 171.0 171.5 172.0 172.5 173.0 STREAM DISTANCE IN MILES ABOVE CONFLUENCE WITH IOWA RIVER 19P 920 920

910 910

900 900

RIVER PROFILES 890 890 CEDAR

88) FLOOD

880 880 (NAVD

FEET IN

870 870

ELEVATION

860 860 IA AGENCY

AREAS 850 850 LEGEND COUNTY, 0.2% ANNUAL CHANCE FLOOD MANAGEMENT 1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 840 4% ANNUAL CHANCE FLOOD" HAWK 10% ANNUAL CHANCE FLOOD INCORPORATED EMERGENCY STREAM BED AND CROSS SECTION LOCATION BLACK 830 FEDERAL 173.0 173.5 174.0 174.5 175.0 175.5 176.0 176.5 177.0 177.5 178.0 178.5 179.0 179.5

STREAM DISTANCE IN MILES ABOVE CONFLUENCE WITH IOWA RIVER 20P 920 920

910 910

900 900

RIVER PROFILES 890 890 CEDAR

88) FLOOD

880 880 (NAVD

FEET IN

870 870

ELEVATION

860 860 IA AGENCY

AREAS 850 850 LEGEND COUNTY, 0.2% ANNUAL CHANCE FLOOD MANAGEMENT 1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 840 4% ANNUAL CHANCE FLOOD" HAWK 10% ANNUAL CHANCE FLOOD INCORPORATED EMERGENCY STREAM BED AND CROSS SECTION LOCATION BLACK 830 FEDERAL 179.5 180.0 180.5 181.0

STREAM DISTANCE IN MILES ABOVE CONFLUENCE WITH IOWA RIVER 21P 880 880

875 875

870 870

DIVERSION PROFILES 865 865 RIVER

88) FLOOD CEDAR 860 860 (NAVD

FEET IN

855 855

ELEVATION

850 850 AGENCY IOWA

AREAS 845 845 LEGEND 0.2% ANNUAL CHANCE FLOOD MANAGEMENT COUNTY, 1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 840 4% ANNUAL CHANCE FLOOD" INCORPORATED 10% ANNUAL CHANCE FLOOD HAWK EMERGENCY STREAM BED AND

CROSS SECTION LOCATION

835 FEDERAL BLACK 8,000 9,000 10,000 11,000 12,000 13,000 14,000 15,000 16,000 17,000 18,000 19,000 20,000 21,000

STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CEDAR RIVER 22P 23P 875 875

870 870

865 865

BRANCH PROFILES 860 860 VIEW

FLOOD CITY

(NAVD) 855 855

FEET IN

850 850

ELEVATION

845 845 IA AGENCY

AREAS 840 840 LEGEND COUNTY, 0.2% ANNUAL CHANCE FLOOD MANAGEMENT 1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 835 4% ANNUAL CHANCE FLOOD" HAWK INCORPORATED 10% ANNUAL CHANCE FLOOD EMERGENCY STREAM BED AND

CROSS SECTION LOCATION ‘ BLACK DATA NOT AVAILABLE 830 FEDERAL 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 2,600

STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BLOWERS CREEK 24P 885 885

880 880

875 875

BRANCH PROFILES 870 870 VIEW

FLOOD CITY

(NAVD) 865 865

FEET IN

860 860

ELEVATION

855 855 IA AGENCY

AREAS 850 850 LEGEND COUNTY, 0.2% ANNUAL CHANCE FLOOD MANAGEMENT 1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 845 4% ANNUAL CHANCE FLOOD" HAWK INCORPORATED 10% ANNUAL CHANCE FLOOD EMERGENCY STREAM BED AND

CROSS SECTION LOCATION ‘ BLACK DATA NOT AVAILABLE 840 FEDERAL 2,600 2,800 3,000 3,200 3,400 3,600 3,800 4,000 4,200 4,400 4,600 4,800 5,000 5,200

STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BLOWERS CREEK 25P 955 955

950 950

945 945

CREEK PROFILES 940 940 CRANE FLOOD

935 935 (NAVD88)

FEET IN

930 930

ELEVATION

925 925 IA AGENCY

AREAS 920 920 LEGEND COUNTY, 0.2% ANNUAL CHANCE FLOOD MANAGEMENT 1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 915 4% ANNUAL CHANCE FLOOD" HAWK 10% ANNUAL CHANCE FLOOD INCORPORATED EMERGENCY STREAM BED AND CROSS SECTION LOCATION BLACK 910 FEDERAL 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000

STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH WAPSIPINICON RIVER 26P 965 965

960 960

955 955

CREEK PROFILES 950 950 CRANE FLOOD

945 945 (NAVD88)

FEET IN

940 940

ELEVATION

935 935 IA AGENCY

AREAS 930 930 LEGEND COUNTY, 0.2% ANNUAL CHANCE FLOOD MANAGEMENT 1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 925 4% ANNUAL CHANCE FLOOD" HAWK 10% ANNUAL CHANCE FLOOD INCORPORATED EMERGENCY STREAM BED AND CROSS SECTION LOCATION BLACK 920 FEDERAL 13,000 14,000 15,000 16,000 17,000 18,000 19,000 20,000 21,000 22,000 23,000 24,000 25,000 26,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH WAPSIPINICON RIVER 27P 970 970

965 965

960 960

CREEK PROFILES 955 955 CRANE FLOOD

950 950 (NAVD88)

FEET IN

945 945

ELEVATION

940 940 IA AGENCY

AREAS 935 935 LEGEND COUNTY, 0.2% ANNUAL CHANCE FLOOD MANAGEMENT 1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 930 4% ANNUAL CHANCE FLOOD" HAWK 10% ANNUAL CHANCE FLOOD INCORPORATED EMERGENCY STREAM BED AND CROSS SECTION LOCATION BLACK 925 FEDERAL 26,000 27,000 28,000 29,000 30,000 31,000 32,000 33,000 34,000 35,000 36,000 37,000 38,000 39,000

STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH WAPSIPINICON RIVER 28P 980 980

975 975 RAYMOND ROAD

970 N ORDWAY ROAD 970 COUNTY HIGHWAY V49/

965 965 CRANE CREEK FLOOD PROFILES

960 960

955 955 ELEVATION IN FEET (NAVD88) ELEVATION

950 950

945 945 LEGEND 0.2% ANNUAL CHANCE FLOOD

1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 940 4% ANNUAL CHANCE FLOOD* 10% ANNUAL CHANCE FLOOD

STREAM BED AND INCORPORATED AREAS

CROSS SECTION LOCATION BLACK HAWK COUNTY, IA

935 FEDERAL EMERGENCY MANAGEMENT AGENCY 39,000 40,000 41,000 42,000 43,000 44,000 45,000 46,000 47,000 48,000 49,000 50,000 51,000 52,000

STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH WAPSIPINICON RIVER 29P 980 980

975 975

970 970

CREEK PROFILES 965 965 CRANE FLOOD

960 960 (NAVD88)

FEET IN

955 955

ELEVATION

950 950 IA AGENCY

AREAS 945 945 LEGEND COUNTY, 0.2% ANNUAL CHANCE FLOOD MANAGEMENT 1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 940 4% ANNUAL CHANCE FLOOD" HAWK 10% ANNUAL CHANCE FLOOD INCORPORATED EMERGENCY STREAM BED AND

CROSS SECTION LOCATION ‘ BLACK DATA NOT AVAILABLE 935 FEDERAL 52,000 53,000 54,000 55,000 56,000 57,000 58,000 59,000 60,000 61,000 62,000 63,000 64,000 65,000

STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH WAPSIPINICON RIVER 30P 990 990

985 985

980 980

CREEK PROFILES 975 975 CRANE FLOOD

(NAVD) 970 970

FEET IN

965 965

ELEVATION

960 960 IA AGENCY

AREAS 955 955 LEGEND COUNTY, 0.2% ANNUAL CHANCE FLOOD MANAGEMENT 1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 950 4% ANNUAL CHANCE FLOOD" HAWK 10% ANNUAL CHANCE FLOOD INCORPORATED EMERGENCY STREAM BED AND CROSS SECTION LOCATION BLACK 945 FEDERAL 65,000 66,000 67,000 68,000 69,000 70,000 71,000 72,000 73,000 74,000 75,000 76,000 77,000 78,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH WAPSIPINICON RIVER 31P