DUBOIS COUNTY, INDIANA · dubois county dubois county, indiana and incorporated areas community community name number *birdseye, town of 180608

Dubois County

DUBOIS COUNTY, INDIANA AND INCORPORATED AREAS COMMUNITY COMMUNITY NAME NUMBER *BIRDSEYE, TOWN OF 180608 DUBOIS COUNTY (Unincorporated Areas) 180054 FERDINAND, TOWN OF 180484 *HOLLAND, TOWN OF 180609 HUNTINGBURG, CITY OF 180362 JASPER, CITY OF 180055 *No Special Flood Hazard Area

PRELIMINARY

Federal Emergency Management Agency

FLOOD INSURANCE STUDY NUMBER 18037CV001A

NOTICE TO FLOOD INSURANCE STUDY USERS

Communities participating in the National Flood Insurance Program have established repositories of flood hazard data for floodplain management and flood insurance purposes. This Flood Insurance Study (FIS) report may not contain all data available within the Community Map Repository. Please contact the Community Map Repository for any additional data. The Federal Emergency Management Agency (FEMA) may revise and republish part or all of this FIS report at any time. In addition, FEMA may revise part of this FIS report by the Letter of Map Revision process, which does not involve republication or redistribution of the FIS report. Therefore, users should consult with community officials and check the Community Map Repository to obtain the most current FIS report components. Selected Flood Insurance Rate Map panels for this community contain information that was previously shown separately on the corresponding Flood Boundary and Floodway Map panels (e.g., floodways, cross sections). In addition, former flood hazard zone designations have been changed as follows: Old Zone: New Zone: A1 through A30 AE B X C X Initial Countywide FIS Effective Date: To be Determined

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TABLE OF CONTENTS

Page

1.0 INTRODUCTION 1

1.1 Purpose of Study 1 1.2 Authority and Acknowledgments 1 1.3 Coordination 3

2.0 AREA STUDIED 3

2.1 Scope of Study 3 2.2 Community Description 5 2.3 Principal Flood Problems 6 2.4 Flood Protection Measures 6

3.0 ENGINEERING METHODS 7

3.1 Hydrologic Analyses 7 3.2 Hydraulic Analyses 11 3.3 Vertical Datum 12

4.0 FLOODPLAIN MANAGEMENT APPLICATIONS 13

4.1 Floodplain Boundaries 13 4.2 Floodways 14

5.0 INSURANCE APPLICATION 21

6.0 FLOOD INSURANCE RATE MAP 22

7.0 OTHER STUDIES 24

8.0 LOCATION OF DATA 24

9.0 BIBLIOGRAPHY AND REFERENCES 24

FIGURES

Figure 1 - Floodway Schematic 15

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TABLES

Table 1 - CCO Meeting Dates 3 Table 2 – Streams Studied By Detailed Methods 4 Table 3 – Streams Studied By Approximate Methods 4 Table 4 – Scope of Study 5 Table 5 – Flood Crest Elevations (Patoka River near Cuzco) 6 Table 6 – Summary of Discharges 9 Table 7 – Channel and Overbank Roughness Factors 12 Table 8 – Floodway Data Table 16 Table 9 – Community Map History 23

EXHIBITS

Exhibit 1 - Flood Profiles Panel #s Ackerman Branch Panel 01P Crooked Creek Panel 02P– 03P Crooked Creek Tributary Panel 04P Grist Run Panel 05P Jahn Creek Panel 06P– 07P Jasper Drain Panel 08P Mill Creek Panel 09P Patoka River Panel 10P-11P Straight River Panel 12P Exhibit 2 - Flood Insurance Rate Map Index

Flood Insurance Rate Map

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FLOOD INSURANCE STUDY

DUBOIS COUNTY, INDIANA AND INCORPORATED AREAS

1.0 INTRODUCTION

1.1 Purpose of Study

This Flood Insurance Study (FIS) revises and supersedes the FIS reports and Flood Insurance Rate Maps (FIRMs) in the geographic area of Dubois County, Indiana, including the City of Jasper, the City of Huntingburg, the Towns of Birdseye, Ferdinand, and Holland, and the unincorporated areas of Dubois County (hereinafter referred to collectively as Dubois County), and aids in the administration of the National Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973. This study has developed flood risk data for various areas of the community that will be used to establish actuarial flood insurance rates and to assist the community in its efforts to promote sound floodplain management. This information will also be used by Dubois County to update existing floodplain regulations as part of the Regular Phase of the National Flood Insurance Program (NFIP), and by local and regional planners to further promote sound land use and floodplain development. Minimum floodplain management requirements for participation in the National Flood Insurance Program (NFIP) are set forth in the Code of Federal Regulations at 44 CFR, 60.3.

In some states or communities, floodplain management criteria or regulations may exist that are more restrictive or comprehensive than the minimum Federal requirements. In such cases, the more restrictive criteria take precedence and the State (or other jurisdictional agency) will be able to explain them.

Furthermore, the Towns of Birdseye and Holland do not have special flood hazard areas within their incorporated limits. However, for the purpose of complete county-wide mapping of Dubois County, these towns are still included in this FIS and FIRMs.

The Digital Flood Insurance Rate Map (DFIRM) and FIS report for this countywide study have been produced in digital format. Flood hazard information was converted to meet the Federal Emergency Management Agency (FEMA) DFIRM database specifications and Geographic Information System (GIS) format requirements. The flood hazard information was created and is provided in a digital format so that it can be incorporated into local GIS and be accessed more easily by the community.

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1.2 Authority and Acknowledgments

The sources of authority for this Flood Insurance Study are the National Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973.

In the original study, the hydrologic and hydraulic analyses for Patoka River, Straight River, and Jahn Creek were prepared by the United States Geological Survey (USGS) for the Federal Emergency Management Association (FEMA), under Inter-Agency Agreement No. IAA-H-9-77, Project Order No. 15. That work was completed in October 1979. In the 1994 revision, the hydrologic and hydraulic analyses for Jahn Creek, Mill Creek, Ackerman Branch, Grist Run, Crooked Creek, Crooked Creek Tributary, and Jasper Drain were prepared by the United States Army Corps of Engineers (USACE), Louisville District, for FEMA, under Inter-Agency Agreement No. EMW- 90-E-3263, Project Order No. 5. This work was completed in March 1992. Information of the authority and acknowledgements for each of the new studies and

previously printed FIS reports and Flood Insurance Rate Maps (FIRMs) for communities within Dubois County was compiled and is shown below:

Jasper, City of: In the 1994 revision, the hydrologic and hydraulic analyses for Jahn Creek, Mill Creek, Ackerman Branch, Grist Run, Crooked Creek, Crooked Creek Tributary, and Jasper Drain were prepared by the United States Army Corps of Engineers (USACE), Louisville District, for FEMA, under Inter-Agency Agreement No. EMW-90-E-3263, Project Order No. 5. This work was completed in March 1992.

New Studies: The hydrologic and hydraulic analyses for approximate

stream reaches of Dubois County were performed by Morley and Associates, on behalf of the Indiana Department of Natural Resources, under Indiana Public Works Project Number E400201B. The Indiana Department of Natural Resources managed the production of this study as part of their Cooperating Technical Partner agreement with the Federal Emergency Management Agency dated April 29, 2004, which was defined by the Indiana DNR Mapping Activity Statement 06-03 dated June 24, 2005 and funded under agreement number EMC-2005-GR-7022.

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Redelineation of the previously effective flood hazard information for this FIS report, correction to the North American Vertical Datum of 1988, and conversion of the unincorporated and incorporated areas of Dubois County into the Countywide format was performed by Morley & Associates, Inc., on behalf of the Indiana Department of Natural Resources, under Indiana Public Works Project Number E400201B. The Indiana Department of Natural Resources managed the production of this study as part of their Cooperating Technical Partner agreement with the Federal Emergency Management Agency dated April 29, 2004, which was defined by the Indiana DNR Mapping Activity Statement 06-03 dated June 24, 2005 and funded under agreement number EMC-2005-GR-7022.

1.3 Coordination

The purpose of an initial Consultation Coordinated Officer’s (CCO’s) meeting is to discuss the scope of the FIS. A final CCO meeting is held to review the results of the study. The dates of the initial and final CCO meetings held for the previously effective FIS reports covering the geographic area of Dubois County, Indiana are shown in Table 1. The initial and final CCO meetings were attended by the study contractor, FEMA (or the Federal Insurance Administration), the Indiana Department of Natural Resources (IDNR), and the affected communities.

Table 1: CCO Meeting Dates for Pre-Countywide FIS

Community Name Initial CCO Date Final CCO Date Dubois County * * (Unincorporated Areas) Huntingburg, City of * * Ferdinand, Town of * * Jasper, City of November 3, 1989 November 9, 1993 *Data Not Available

For this countywide FIS, an initial CCO meeting was held on August 24, 2005, and was attended by IDNR, the Natural Resources Conservation Service (NRCS), the Dubois County Soil & Water Conservation District, and representatives from the Cities of Huntingburg and Jasper, as well as the Towns of Birdseye, Ferdinand, and Holland, and Dubois County. The results of the countywide study were reviewed at the final CCO meeting held on --, and attended by representatives of FEMA, IDNR and ______. All problems raised at that meeting have been addressed.

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2.0 AREA STUDIED

2.1 Scope of Study

This FIS covers the geographic area of Dubois County, Indiana, including the incorporated communities listed in Section 1.1 All FIRM panels for Dubois County have been revised, updated, and republished in countywide format as a part of this FIS. The FIRM panel index, provided as Exhibit 2, illustrates the revised FIRM panel layout. Approximate methods of analysis were used to study those areas having a low development potential or minimal flood hazards as identified during the initial CCO meeting. For this study, twelve (12) new stream reaches were studied using approximate methods. The scope and methods of new approximate studies were proposed and agreed upon by FEMA, the IDNR, and Dubois County. This FIS update also incorporates the determination of letters issued by FEMA resulting in map changes (Letters of Map Change, or LOMC’s). No LOMCs have been incorporated into the mapped changes. Letters of Map Amendment (LOMA’s) revalidated for this study are summarized in the Summary of Map Actions (SOMA) included in the Technical Support Data Notebook (TSDN) associated with this FIS update. Copies of the TSDN may be obtained from the Community Map Repository.

Table 2: Streams Studied by Detailed Methods Ackerman Branch Jasper Drain Crooked Creek Mill Creek Crooked Creek Tributary Patoka River Grist Run Straight River Jahn Creek

Table 3: Streams Studied by Approximate Methods Altar Creek Hall Creek Anderson River Hunley Creek Bison Branch Indian Creek Brunner Creek Jasper Brook Buffalo Stream Mill Creek Calf Branch Patoka River Cline Branch Sherritt Drain Dick Creek Shiloh Drain East Fork Short Creek Flat Creek Sugar Creek Green Creek

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Table 4: Scope of Study

Stream Limits of Redelineation Study Crooked Creek Limit of Zone A to Schuetter Rd. East Fork White River County Line to County Line Jahn Creek S Meridian Rd. to U/S of Maplecrest Blvd Mill Creek D/S of N Portersville Rd to W 300 N Patoka River US 231 to N Kellerville Rd. Stream Limits of Approximate Study Altar Creek Mouth to U/S of SR 56 Anderson River South County Line to West County Line Brunner Creek Mouth to Just South of W 1100 S Flat Creek Mouth to U/S of S Schnell Rd. Green Creek Mouth to Just U/S of T3S R4W Sec. 23 Hall Creek Mouth to Intersection of S 975 E And E Schnellville Rd. Hunley Creek Mouth to South County Line Indian Creek Mouth to Just Above S Club Rd. Mill Creek Mouth to Limit of Zone A Patoka River West County Line to Lower Limit of

Zone AE and Upper Limit of Zone AE to East County Line

Short Creek Mouth to Just Above W Holland Rd. Sugar Creek Mouth to Just Above S 825 W

2.2 Community Description

Dubois County is located near the southern border of Indiana and is bordered by Daviess and Martin Counties to the north, Orange and Crawford Counties to the east, Perry, Spencer, and Warrick Counties to the south, and Pike County to the west. Dubois County is located approximately 80 miles southwest of Indianapolis and approximately 39 miles northeast of Evansville. Dubois County is served by Interstate 64, US routes 231, and State Route 64. According to the Indiana Business Research Center, the population of Dubois County in 2005 was reported to be 102,592. According to U.S. Census Data from the year 2000, Dubois County is estimated to have a population size of approximately 40858. The City of Jasper has a population size equal to a little over one-fourth of the county at 13767, whereas the City of Huntingburg’s estimated size comes out around 5929.

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The City of Jasper is located in central Dubois County in southwestern Indiana. The City of Jasper is located 65 miles west of Louisville and 105 miles south of Indianapolis. Dubois County completely surrounds the City of Jasper. The total land areas within the extraterritorial limits is approximately 38 square miles. According to the U.S. Census Bureau figures, the population has increased from 6737 in 1960 to 8641 in 1970. The climate in southern Indiana is characteristically humid. Average daily temperatures range from 33 degrees Fahrenheit (ºF) in winter to 79 ºF in summer. Average annual precipitation for the region is 42 inches, and average recorded snowfall is 14 inches. The precipitation is uniformly distributed throughout the year. The soil classifications in the floodplains in the City of Jasper are generally silty loams and alluvial deposits of the Stendal-Haymond-Wakeland-Nolin Association and are generally flat and poorly drained.

2.3 Principal Flood Problems

The history of flooding on the streams in the City of Jasper indicates that flooding may occur during any season of the year. Flooding that occurs between January and May is usually the result of spring rainfall and snowmelt. Flooding during the summer months is often associated with thunderstorms. The discharges and recurrence intervals associated with these events at the USGS gagging station located on the Patoka River near the City of Jasper are listed below.

Table 5: Flood Crest Elevations

USGS gage for Patoka River Near Cuzco Elevation

Year Peak Discharge(cfs) (feet, NAVD 1988) 1913 12300 495.72 1962 4990 492.43 1964 14700 496.64 1969 4840 492.33 1975 6410 488.86 1996 2830 *

*Data Not Available

Discharges for the 1913 and 1937 floods were estimated from high water marks furnished by local residents. No historic data were available for the Straight River and Jahn Creek. Damage estimates for the March 1964 flood are in excess of $9000 for Dubois County.

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2.4 Flood Protection Measures

The City of Jasper is protected by the multiple-purpose Patoka Reservoir located 12 miles east-northeast of Jasper and 0.75 miles northeast of Ellsworth, Indiana, at River Mile 118. The Patoka Reservoir’s earth and rock-fill dam is 1550 feet in length and 84 feet high. The drainage area above the dam is 168 square miles. The outlet consists of a control tower with two service gates, 4-foot by 12-foot, discharging to an 8-foot by 12-foot concrete conduit, and a spillway 370 feet wide and 2800 feet long. The total storage capacity at the spillway crest (elevation 548 feet), is 298380 acre per foot. The dam was closed and began storing water in February 1978.

3.0 ENGINEERING METHODS

For the flooding sources studied by detailed methods in Dubois County, standard hydrologic and hydraulic study methods were used to determine the flood hazard data required for this study. Flood events of a magnitude that are expected to be equaled or exceeded once on the average during any 10-, 50-, 100-, or 500-year period (recurrence interval) have been selected as having special significance for floodplain management and for flood insurance rates. These events, commonly termed the 10-, 50-, 100-, and 500-year floods, have a 10-, 2-, 1-, and 0.2-percent chance, respectively, of being equaled or exceeded during any year. Although the recurrence interval represents the long-term, average period between floods of a specific magnitude, rare floods could occur at short intervals or even within the same year. The risk of experiencing a rare flood increases when periods greater than 1 year are considered. For example, the risk of having a flood that equals or exceeds the 1-percent- annual-chance flood in any 50-year period is approximately 40 percent (4 in 10); for any 90-year period, the risk increases to approximately 60 percent (6 in 10). The analyses reported herein reflect flooding potentials based on conditions existing in the community at the time of completion of this study. Maps and flood elevations will be amended periodically to reflect future changes.

3.1 Hydrologic Analyses

Hydrologic analyses were carried out to establish peak discharge-frequency relationships for each flooding source studied by detailed methods affecting Dubois County. 1994 FIS

In the original study, three USGS stations on the Patoka River were the principal sources of data for defining the discharge-frequency relationships for the Patoka River. Values for the 10-, 50-, 100-, and 500-year peak discharges were obtained from a log-Pearson Type III distribution of the annual peak flow data through September 1977.

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To account for the effects of the storage in the Patoka Reservoir, the USACE used their reservoir routing computer program to recalculate the peak discharges. The calculations indicated that within the study area the peak discharges on the Patoka River were reduced. A combination of methods was used to define discharge-frequency data for the Straight River and Jahn Creek. The methods include: (1) A regional relationship relating basin characteristics to streamflow characteristics; (2) regional relationships of streamflow, drainage area and percentage of urbanization; and (3) regional relationships of peak discharge and drainage area for nearby gaging stations having similar hydrologic settings. In this revision, an analysis was made by the USACE, to obtain frequency discharges using Water Resources Council Bulletin 17B for ten stations with small drainage areas in the general vicinity of the study area. Reliable generalized discharge versus drainage area curves for the four required frequency floods could not be drawn from these data because of flow variation at these stations. A USACE multiple linear regression program was utilized using the “best fit seven” of the above stations to develop regression equations based on computed discharge, drainage area, and stream slope. Flow values for each of the seven streams in the study were developed for the four frequency floods and furnished to the Indiana Department of Natural Resources (IDNR) for acceptance. IDNR, who has jurisdiction in Indiana for floodplain management, uses another method to check the flood flow frequency values. IDNR utilized the TR-20 modeling method, which is a variation of the USACE’s HEC-1 model using SCS methodology. The parameters for the model were developed from USGS 7.5 minute series topographic maps, the SCS Soil Survey for Dubois County, USACE’s HEC-2 data for the FIS, and aerial photography taken by the Indiana Department of Transportation. The frequency discharge values resulting from this study were generally higher than the USACE original values, part of which was caused by using increased SCS values to account for increased urbanization. The USACE made a cursory check of part of the data, and agreed to use the more conservative flow values, except in some areas where the streams were controlling approximately one square mile or less. IDNR agreed to this change. Flow values were then coordinated for the 10-, 25-, 50-, and 100-year floods. The 500-year flood discharges were extrapolated from these data. This Revision

Table 6 contains a summary of peak discharges for the 10-, 2-, 1-, and 0.2-percent annual chance floods, where applicable, for each flooding source studied in detail in Dubois County. Peak discharges in the table were compiled from previously effective FIS reports for Dubois County and incorporated areas. Source citations refer to the source of the detailed study.

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Table 6. Summary of Discharges Peak Discharge (cfs) 10% 2% 1% 0.2% Flooding Source Drainage Area Annual Annual Annual AnnualAnd Location(Square Miles) Chance Chance Chance Chance ACKERMAN BRANCH At mouth 1.40 755 1130 1280 1650 At River Mile 0.33 1.24 710 1060 1200 1530 At River Mile 1.00 0.82 555 825 935 1200 At North 400 Road 0.58 455 675 765 970 (River Mile 1.26) At River Mile 1.35 0.20 245 365 410 520 CROOKED CREEK At mouth 6.78 2600 3690 4200 5200 At North 50- West 450 Road 5.56 2330 3300 3790 4600 Above Evans Brook 3.90 1940 2770 3140 3850 (River Mile 2.15) At State Route 56 1.90 1320 1900 2150 2670 Below Jasper Drain 1.51 1190 1690 1900 2400 (River Mile 3.94) At River Mile 4.05 0.81 750 1050 1170 1430 CROOKED CREEK TRIBUTARY At Mouth 0.41 430 605 670 835 GRIST RUN At mouth 1.32 525 760 870 1150 At River Mile 0.40 1.00 445 645 740 970 At River Mile 1.21 0.35 240 350 400 520 (upstream limit of detailed study) JAHN CREEK At Cedarcrest Court 0.70 720 1010 1140 1300 At Maplecrest Boulevard 0.56 600 840 950 1070 JASPER DRAIN At Mouth 0.70 630 925 1030 1280 At River Mile 0.15 0.54 545 760 850 1060 (Crooked Creek Tributary)

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Table 6. Summary of Discharges - continued

Peak Discharge (cfs) 10% 2% 1% 0.2% Flooding Source Drainage Area Annual Annual Annual AnnualAnd Location(Square Miles) Chance Chance Chance Chance MILL CREEK At Mouth 19.60 4070 5800 6600 8000 At North 600 Road 12.20 3110 4400 5050 6050 (downstream limit of detailed study) Above Ackerman Branch 4.69 1780 2500 2890 3640 At River Mile 4.53 4.45 1730 2450 2820 3350 (0.43 mile above Ackerman Branch) At North 400 Road 3.45 1500 2100 2420 2900 Above Grist Run 1.40 890 1230 1420 1700 At River Mile 6.90 1.10 765 1080 1240 1490 (0.30 mile above Grist Run) At River Mile 7.46 0.90 690 960 1110 1350 (upstream limit of detailed study, just downstream of North 300 Road) PATOKA RIVER Just Downstream

of Hunley Creek 433 9000 14000 16600 21500 Just Upstream of the confluence of the Straight River 279 6100 9600 12000 17000 Approximately four miles upstream of 15th Street 262 5500 8600 11000 16000 STRAIGHT RIVER At mouth 62.4 7500 12000 14200 18500

Standard and accepted hydrologic methods were used to develop discharge data on the study streams in Dubois County. These data were coordinated with the Indiana Department of Natural Resources, the Natural Resources Conservation Service (formally the Soil Conservation Service), the U. S. Geological Survey and the Louisville District of the U. S. Army Corps of Engineers, through a Memorandum Of

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Understanding dated May 6, 1976. Discharge curves for the 10%, 2%, 1%, and 0.2% annual chance floods were developed for each study stream using several different procedures and compared for consistency.

3.2 Hydraulic Analyses

Analyses of the hydraulic characteristics of flooding from the sources studied were carried out to provide estimates of the elevations of floods of the selected recurrence intervals. Users should be aware that flood elevations shown on the Flood Insurance Rate Map (FIRM) represent rounded whole-foot elevations and may not exactly reflect the elevations shown on the Flood Profiles or in the Floodway Data table in the FIS report. Flood elevations shown on the FIRM are primarily intended for flood insurance rating purposes. For construction and/or floodplain management purposes, users are cautioned to us the flood elevation data presented in this FIS report in conjunction with the data shown on the FIRM.

Cross sections for the backwater analyses were obtained from a variety of sources including: physical survey data, IDNR contour mapping, USGS topographic mapping and local contour mapping. Water-surface elevations for floods of the selected recurrence intervals were computed through use of the USACE HEC-2 step-backwater computer program, and the USGS E431 step-backwater computer program for streams originally studied in the City of Jasper Flood Insurance Study. For the new approximate study reaches, the USACE HEC-RAS program was used. HEC-RAS is an updated version of the HEC-2 program used to perform step-backwater analyses. Flood profiles were prepared for all streams studied by detailed methods and show computed water-surface elevations to an accuracy of 0.5 feet for floods of the selected recurrence intervals. For this countywide FIS, flood profiles and approved LOMRs have been consolidated into continuous stream reaches and adjusted to reflect the current vertical datum as described in Section 3.3. New profiles have been prepared for the new detailed studies and for the purposes of incorporating the LOMRs described in Section 2.1 above. Starting water-surface elevations for the Wabash River were determined using theoretical rating curves for nearby gaging stations. Starting elevations for all other streams studied in detail were determined using normal depth. Channel and overbank roughness factors (Manning’s “n” values) used in the hydraulic computations were chosen by engineering judgment and were based on field observations of the stream and floodplain areas. Channel and overbank roughness factors used in the detailed studies are summarized by stream in Table 7.

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Table 7. Channel and Overbank Roughness Factors

Roughness Coefficients Stream Main Channel Overbanks Ackerman Branch 0.045 0.050 Crooked Creek 0.045-0.050 0.045-0.070 Crooked Creek Tributary 0.045-0.050 0.045 Grist Run 0.040 0.050 Jahn Creek 0.050 0.045-0.065 Jasper Drain 0.055 0.045-0.070 Mill Creek 0.045-0.050 0.050-0.065 For new approximate study areas, analyses were based on field inspection and modeling of the stream reaches using HEC-RAS models and 2005 Digital Elevation Model (DEM) data. Detailed structural measurements or field surveying was not performed. For streams studied by detailed methods, cross section geometry was derived from topographic mapping from the 2005 state orthophotography project. Starting elevations were assumed to be normal depth. The hydraulic analyses for this study were based on unobstructed flow. The flood elevations shown on the Flood Profiles (Exhibit 1) are thus considered valid only if hydraulic structures remain unobstructed, operate properly, and do not fail.

3.3 Vertical Datum

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 in use for newly created or revised FIS reports and FIRMs was the National Geodetic Vertical Datum of 1929 (NGVD29). With the finalization of the North American Vertical Datum of 1988 (NAVD88), many FIS reports and FIRMs are being prepared using NAVD88 as the referenced vertical datum. All flood elevations shown in this FIS report and on the FIRM are referenced to NAVD88. Structure and ground elevations in the community must, therefore, be referenced to NAVD88. It is important to note that adjacent communities may be referenced to NGVD29. This may result in differences in Base Flood Elevations (BFEs) across the corporate limits between the communities. In this revision, a vertical datum conversion of -0.38 feet was calculated at the centroid of the county and used to convert all elevations in Dubois County from NGVD29 to NAVD88 using the National Geologic Survey’s VERTCON online utility (VERTCON, 2005).

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For more information on NAVD88, see the FEMA publication entitled Converting the National Flood Insurance Program to the North American Vertical Datum of 1988 (FEMA, June 1992), or contact the Vertical Network Branch, National Geodetic Survey, Coast and Geodetic Survey, National Oceanic and Atmospheric Administration, Rockville, Maryland 20910 (Internet address http://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 Technical Support Data Notebook associated with the FIS report and FIRM for this community. Interested individuals may contact FEMA to access these data.

4.0 FLOODPLAIN MANAGEMENT APPLICATIONS

The NFIP encourages State and local governments to adopt sound floodplain management programs. Therefore, each FIS provides 1-percent-annual-chance flood elevations and delineations of the 1- and 0.2-percent-annual-chance floodplain boundaries and 1-percent-annual-chance floodway to assist communities in developing floodplain management measures. This information is presented on the FIRM and in many components of the FIS report, including Flood Profiles, and the Floodway Data table. Users should reference the data presented in the FIS report as well as additional information that may be available at the local map repository before making flood elevation and/or floodplain boundary determinations.

4.1 Floodplain Boundaries

To provide a national standard without regional discrimination, the 1-percent-annual-chance flood has been adopted by FEMA as the base flood for floodplain management purposes. The 0.2-percent-annual-chance flood is employed to indicate additional areas of flood risk in the community. For each stream studied by detailed methods, the 1- and 0.2-percent-annual-chance floodplain boundaries have been delineated using the flood elevations determined at each cross section. The 1- and 0.2-percent-annual-chance floodplain boundaries are shown on the FIRM (Exhibit 2). On this map, the 1-percent-annual-chance floodplain boundary corresponds to the boundary of the areas of special flood hazards (Zones A, AE, V, and VE); and the 0.2-percent-annual-chance floodplain boundary corresponds to the boundary of areas of moderate flood hazards. In cases where the 1- and 0.2-percent-annual-chance floodplain boundaries are close together, only the 1-percent-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.

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For the streams studied by approximate methods, only the 1-percent-annual chance floodplain boundary is shown on the FIRM (Exhibit 2).

4.2 Floodways

Encroachment on floodplains, such as structures and fill, reduces flood-carrying capacity, increases flood heights and velocities, and increases flood hazards in areas beyond the encroachment itself. One aspect of floodplain management involves balancing the economic gain from floodplain development against the resulting increase in flood hazard. For purposes of the NFIP, a floodway is used as a tool to assist local communities in this aspect of floodplain management. Under this concept, the area of the 1-percent-annual-chance floodplain is divided into a floodway and a floodway fringe. The floodway is the channel of a stream, plus any adjacent floodplain areas, that must be kept free of encroachment so that the 1-percent-annual-chance flood can be carried without substantial increases in flood heights. Minimum Federal standards limit such increases to 1.0 foot, provided that hazardous velocities are not produced. The floodways in this study are presented to local agencies as minimum standards that can be adopted directly or that can be used as a basis for additional floodway studies. The State of Indiana, however, per Indiana Code IC 14-28-1 and Indiana Administrative Code 312 IAC 10, has designated that encroachment in the floodplain is limited to that which will cause no significant increase in flood height. As a result, floodways for this study are delineated based on a flood surcharge of less than 0.15 feet. The floodways in this study were approved by the IDNR, and are presented to local agencies as minimum standards that can be adopted directly or that can be used as a basis for additional floodway studies. The floodway presented in this FIS report and on the FIRM was 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. The results of the floodway computations have been tabulated for selected cross sections (Table 8). In cases where the floodway and 1-percent-annual-chance floodplain boundaries are either close together or collinear, only the floodway boundary has been shown. The area between the floodway and 1-percent-annual-chance floodplain boundaries is termed the floodway fringe. The floodway fringe encompasses the portion of the floodplain that could be completely obstructed without increasing the water-surface elevation of the 1-percent-annual-chance flood more than 0.14 feet at any point. Typical relationships between the floodway and the floodway fringe and their significance to floodplain development are shown in Figure 1.

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Figure 1: Floodway Schematic

WIDTH 6

SECTION

AREA

MEAN

VELOCITY REGULATORY

WITHOUT

FLOODWAY

WITH

FLOODWAY INCREASE

(FEET) (SQ. FEET) (FT/SEC) (FEET, NAVD) (FEET, NAVD) (FEET, NAVD) (FEET)

ACKERMAN BRANCH

A 0.330 1,1873 2,925 1.3 452.2 452.1

4 452.2 0.1

B 0.565 * 480 2.5 453.1 453.1 453.2 0.1

C 0.782 214 414 2.9 456.4 456.4 456.5 0.1

D 1.000 252 356 2.6 460.2 460.2 460.3 0.1

E 1.230 264 397 2.0 463.6 463.6 463.7 0.1

F 1.270 261 335 2.3 464.0 464.0 464.1 0.1

G 1.350 53 111 3.7 465.4 465.4 465.5 0.1

H 1.470 21 74 5.6 468.6 468.6 468.7 0.1

CROOKED CREEK

A 1.590 635 4,229 0.9 448.0 447.55

447.6 0.1

B 1.830 596 3,498 1.1 448.0 447.75

447.8 0.1

C 2.170 636 1,930 1.6 448.3 448.3 448.4 0.1

D 2.320 581 1,487 2.1 449.0 449.0 449.1 0.1

E 2.350 687 1,831 1.7 449.2 449.2 449.3 0.1

F 2.510 * 1,463 2.1 450.0 450.0 450.1 0.1

G 2.550 * 1,660 1.5 450.2 450.2 450.3 0.1

H 2.670 691 1,071 2.4 450.8 450.8 450.9 0.1

I 2.920 289 739 3.5 453.8 453.8 453.9 0.1

J 3.300 352 1,011 2.5 457.5 457.5 457.6 0.1

K 3.440 270 698 3.1 458.6 458.6 458.7 0.1

L 3.490 407 2,123 1.0 460.8 460.8 460.9 0.1

M 3.640 370 1,208 1.8 460.9 460.9 461.0 0.1

N 3.765 289 713 3.0 461.5 461.5 461.6 0.1

O 3.930 283 667 2.8 463.5 463.5 463.6 0.1

P 4.050 277 543 2.2 464.8 464.8 464.9 0.1

1ACKERMAN BRANCH - MILES ABOVE CONFLUENCE WITH MILL CREEK

5ELEVATION COMPUTED WITHOUT CONSIDERATION OF BACKWATER EFFECTS FROM PATOKA RIVER

2CROOKED CREEK - MILES ABOVE CONFLUENCE WITH PATOKA RIVER

6FLOODWAY WIDTH MAY DIFFER FROM FIRM. SEE FIRM FOR REGULATORY WIDTH.

3COMBINED MILL CREEK/ACKERMAN BRANCH FLOODWAY * ADMINISTRATIVE FLOODWAY

4ELEVATION COMPUTED WITHOUT CONSIDERATION OF BACKWATER EFFECTS FROM MILL CREEK

FEDERAL EMERGENCY MANAGEMENT AGENCY

TABLE 8

FLOODWAY DATA

DUBOIS COUNTY, IN

AND INCORPORATED AREASACKERMAN BRANCH - CROOKED CREEK

FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION

CROSS SECTION DISTANCE1,2

Page 1

WIDTH6

SECTION

AREA

MEAN

VELOCITY REGULATORY

WITHOUT

FLOODWAY

WITH

FLOODWAY INCREASE


CROOKED CREEK

TRIBUTARY

A 0.06 78 131 5.1 466.4 466.4 466.5 0.1

B 0.09 106 185 3.6 467.7 467.7 467.8 0.1

C 0.13 209 432 1.6 468.7 468.7 468.8 0.1

GRIST RUN

A 0.01 348 849 1.0 467.7 467.7 467.8 0.1

B 0.10 136 402 2.2 467.8 467.8 467.9 0.1

C 0.23 129 307 2.8 468.5 468.5 468.6 0.1

D 0.35 237 296 2.9 470.3 470.3 470.4 0.1

E 0.39 3044 588 1.5 471.0 471.0 471.1 0.1

F 0.42 2324 338 2.2 471.1 471.1 471.2 0.1

G 0.47 3254 502 1.5 471.5 471.5 471.6 0.1

JAHN CREEK

A 0.35 707 987 1.8 454.2 452.35

452.4 0.1

B 0.45 590 1,121 1.6 454.2 453.25

453.3 0.1

C 0.56 744 1,381 1.3 454.2 453.85

453.9 0.1

D 0.64 577 686 2.6 454.4 454.4 454.5 0.1

E 0.76 313 569 3.2 456.4 456.4 456.4 0.0

F 0.82 256 560 3.2 457.1 457.1 457.1 0.0

G 0.86 309 865 2.1 457.9 457.9 458.0 0.1

H 0.89 290 849 2.1 458.0 458.0 458.1 0.1

I 0.95 301 784 2.3 458.5 458.5 458.6 0.1

J 0.97 349 1,001 1.8 458.7 458.7 458.8 0.1

K 1.04 475 1,360 1.3 459.1 459.1 459.2 0.1

L 1.12 625 1,567 1.1 459.3 459.3 459.4 0.1

M 1.16 565 808 1.9 459.5 459.5 459.6 0.1

1CROOKED CREEK TRIB - MILES ABOVE CONFLUENCE WITH CROOKED CREEK

2GRIST RUN - MILES ABOVE CONFLUENCE WITH MILL CREEK 5

ELEVATION COMPUTED WITHOUT CONSIDERATION OF BACKWATER EFFECTS FROM STRAIGHT RIVER3 JAHN CREEK - MILES ABOVE CONFLUENCE WITH STRAIGHT RIVER

6 FLOODWAY WIDTH MAY DIFFER FROM FIRM. SEE FIRM FOR REGULATORY WIDTH.

4THIS WIDTH EXTENDS BEYOND EXTRATERRITORIAL LIMITS

FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA

CROOKED CREEK TRIBUTARY - GRIST RUN - JAHN CREEK

FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION

CROSS SECTION DISTANCE1,2,3

TABLE 8

DUBOIS COUNTY, IN

AND INCORPORATED AREAS

FLOODING SOURCE

Page 2

WIDTH3

SECTION

AREA

MEAN

VELOCITY REGULATORY

WITHOUT

FLOODWAY

WITH

FLOODWAY INCREASE


JAHN CREEK

(continued)

N 1.240 388 738 2.1 460.7 460.7 460.7 0.0

O 1.300 290 635 2.5 461.4 461.4 461.5 0.1

P 1.330 282 598 2.6 461.8 461.8 461.9 0.1

Q 1.350 192 461 3.4 462.1 462.1 462.2 0.1

R 1.410 137 585 2.7 465.6 465.6 465.7 0.1

S 1.450 62 335 4.7 465.8 465.8 465.9 0.1

T 1.500 224 1300 1.2 467.6 467.6 467.7 0.1

U 1.590 500 2,045 0.7 467.7 467.7 467.8 0.1

V 1.670 516 1,497 0.9 467.8 467.8 467.9 0.1

W 1.760 406 1,114 1.3 468.0 468.0 468.1 0.1

X 1.790 372 643 2.2 468.1 468.1 468.2 0.1

Y 1.840 309 749 1.8 471.0 471.0 471.1 0.1

Z 1.883 198 484 2.7 471.4 471.4 471.5 0.1

AA 1.970 162 260 5.1 473.4 473.4 473.4 0.0

AB 2.010 219 500 2.3 474.4 474.4 474.5 0.1

AC 2.020 201 433 2.6 474.4 474.4 474.5 0.1

AD 2.040 114 224 5.1 474.6 474.6 474.7 0.1

AE 2.080 178 367 3.1 475.8 475.8 475.9 0.1

AF 2.140 36 119 8.0 476.9 476.9 477.0 0.1

AG 2.190 177 436 2.2 480.8 480.8 480.8 0.0

AH 2.230 150 228 4.2 481.0 481.0 481.0 0.0

AI 2.310 200 369 2.6 482.5 482.5 482.5 0.0

JASPER DRAIN

A 0.150 41 229 3.7 465.3 465.3 465.4 0.1

B 0.245 41 173 4.9 466.7 466.7 466.8 0.1

C 0.340 41 168 5.1 469.4 469.4 469.4 0.0

D 0.390 114 356 2.4 472.8 472.8 472.9 0.1

1 JAHN CREEK - MILES ABOVE CONFLUENCE WITH STRAIGHT RIVER

2JASPER DRAIN - MILES ABOVE CONFLUENCE WITH CROOKED CREEK



FLOODING SOURCE FLOODWAY

DISTANCE1,2

TABLE 8

FLOODWAY DATA

DUBOIS COUNTY, IN

AND INCORPORATED AREASJAHN CREEK - JASPER DRAIN

1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION

CROSS SECTION

Page 3

WIDTH4

SECTION

AREA

MEAN

VELOCITY REGULATORY

WITHOUT

FLOODWAY

WITH

FLOODWAY INCREASE


MILL CREEK

A 4.530 1,1872 2,925 1.4 452.2 452.2 452.3 0.1

B 4.800 601 1,392 2.0 453.5 453.5 453.6 0.1

C 5.000 191 506 5.6 455.5 455.5 455.6 0.1

D 5.040 295 796 3.5 456.9 456.9 457.0 0.1

E 5.720 694 1,722 1.6 461.7 461.7 461.8 0.1

F 5.760 714 1,836 1.3 461.8 461.8 461.9 0.1

G 6.300 333 640 3.8 464.6 464.6 464.7 0.1

H 6.340 575 899 2.7 465.2 465.2 465.3 0.1

I 6.530 371 857 2.8 467.2 467.2 467.3 0.1

J 6.715 100 297 4.2 468.8 468.8 468.9 0.1

K 6.900 80 228 5.4 471.5 471.5 471.5 0.0

L 7.180 80 246 5.0 476.6 476.6 476.6 0.0

M 7.460 103 269 4.1 480.9 480.9 481.0 0.1

PATOKA RIVER

A 78.43 4178/6803 25,148 0.6 452.0 452.0 452.0 0.0

B 78.90 4437/32103 30,126 0.5 452.0 452.0 452.0 0.0

C 79.48 2724 16,398 0.9 452.7 452.7 452.7 0.0

D 79.62 3649 19,170 0.8 452.7 452.7 452.7 0.0

E 81.53 4980 21,946 0.6 453.2 453.2 453.2 0.0

F 82.70 3326 9,190 1.3 453.6 453.6 453.6 0.0

G 83.64 671 3,783 3.2 456.2 456.2 456.2 0.0

H 83.67 823 3,987 3.0 456.4 456.4 456.4 0.0

I 83.85 467 3,152 3.8 456.9 456.9 456.9 0.0

J 84.23 1018 6,071 2.0 458.1 458.1 458.1 0.0

K 84.74 2323 14,374 0.8 458.3 458.3 458.3 0.0

L 84.95 1711 9,471 1.3 458.4 458.4 458.4 0.0

1MILES ABOVE MOUTH

2COMBINED MILL CREEK/ACKERMAN BRANCH FLOODWAY

3TOTAL WIDTH / WIDTH WITHIN EXTRATERRITORIAL LIMITS



CROSS SECTION DISTANCE1


MILL CREEK - PATOKA RIVER

TABLE 8

FLOODWAY DATA

DUBOIS COUNTY, IN

AND INCORPORATED AREAS

Page 4

WIDTH4

SECTION

AREA

MEAN

VELOCITY REGULATORY

WITHOUT

FLOODWAY

WITH

FLOODWAY INCREASE


PATOKA RIVER

(continued)

M 85.65 1165 5704 2.1 458.7 458.7 458.7 0.0

N 85.70 671 2786 4.3 458.8 458.8 458.8 0.0

O 85.93 345 3682 3.3 460.5 460.5 460.5 0.0

P 86.33 716 4884 2.5 462.0 462.0 462.0 0.0

Q 86.50 541 4543 2.6 462.3 462.3 462.3 0.0

R 86.77 520 5066 2.4 463.1 463.1 463.1 0.0

S 87.48 874 8584 1.4 464.4 464.4 464.4 0.0

T 87.63 1026 9822 1.2 464.5 464.5 464.5 0.0

U 88.48 2267 19,089 0.6 464.6 464.6 464.6 0.0

V 88.87 1051 8137 1.4 464.6 464.6 464.6 0.0

W 89.22 1166 11462 1.0 464.8 464.8 464.8 0.0

X 90.18 2794 25,391 0.5 465.1 465.1 465.1 0.0

Y 90.32 1205 10,003 1.2 465.2 465.2 465.2 0.0

Z 90.81 2279/23602

21,053 0.6 465.3 465.3 465.3 0.0

STRAIGHT RIVER

A 0.540 1,880 13,265 1.1 453.2 452.43 452.4 0.0

B 1.290 1,695 8,039 1.8 453.6 453.6 453.6 0.0

C 2.010 3,184 14,979 0.9 454.6 454.6 454.6 0.0

1MILES ABOVE MOUTH

2TOTAL WIDTH / WIDTH WITHIN EXTRATERRITORIAL LIMITS

3ELEVATION COMPUTED WITHOUT CONSIDERATION OF BACKWATER EFFECTS FROM PATOKA RIVER



CROSS SECTION DISTANCE1

TABLE 8

FLOODWAY DATA

DUBOIS COUNTY, IN

AND INCORPORATED AREASPATOKA RIVER - STRAIGHT RIVER


Page 5

21

5.0 INSURANCE APPLICATIONS

For flood insurance rating purposes, flood insurance zone designations are assigned to a community based on the results of the engineering analyses. These zones are as follows: Zone A Zone A is the flood insurance risk zone that corresponds to the 1-percent-annual-chance floodplains that are determined in the FIS by approximate methods. Because detailed hydraulic analyses are not performed for such areas, no BFEs or base flood depths are shown within this zone. Zone AE Zone AE is the flood insurance risk zone that corresponds to the 1-percent-annual-chance floodplains that are determined in the FIS by detailed methods. In most instances, whole-foot BFEs derived from the detailed hydraulic analyses are shown at selected intervals within this zone. Zone X Zone X is the flood insurance risk zone that corresponds to areas outside the 0.2-percent-annual-chance floodplain, areas within the 0.2-percent-annual-chance floodplain, and areas of 1-percent-annual-chance flooding where average depths are less than 1 foot, areas of 1-percent-annual-chance flooding where the contributing drainage area is less than 1 square mile, and areas protected from the 1-percent-annual-chance flood by levees. No BFEs or base flood depths are shown within this zone.

22

6.0 FLOOD INSURANCE RATE MAP

The FIRM is designed for flood insurance and floodplain management applications. For flood insurance applications, the map designates flood insurance risk zones as described in Section 5.0 and, in the 1-percent-annual-chance floodplains that were studied by detailed methods, shows selected whole-foot BFEs or average depths. Insurance agents use the zones and BFEs in conjunction with information on structures and their contents to assign premium rates for flood insurance policies. For floodplain management applications, the map shows by tints, screens, and symbols, the 1- and 0.2-percent-annual-chance floodplains, floodways, and the locations of selected cross sections used in the hydraulic analyses and floodway computations. The current FIRM presents flooding information for the entire geographic area of Dubois County. Previously, separate FIRMs were prepared for each identified flood prone incorporated community and for the unincorporated areas of the county. Historical data relating to the maps prepared for each community are presented in Table 9.

*Birdseye, Town of N/A None N/A None

Dubois C ounty December 13, 1974 June 10, 1977 N/A None

(Unincorporated A reas)

Ferdinand, Town of A ugust 5 , 1985 None A ugust 5 , 1985 None

*Holland, Town of N/A None N/A None

Huntingburg, Town of March 28, 1975 February 6 , 1976 September 16, 1988 October 6, 1998

O ctober 1 , 1976

Jasper, C ity of O c tober 26, 1973 June 11, 1976 June 1 , 1982 O ctober 18, 1994

*No Special Flood Hazard Area

FIRM REV ISIO NS

DA TE

COMMUNITY MAP HISTORY


DUBOIS COUNTY, IN

(AND INCORPORATED AREAS)

TABLE 9

COMMUNITY NAME INIT IA L IDENTIFICA T IO N

FLOOD HA ZARD

BOUNDARY MA P

REV ISIO NS DA TE

FIRM EFFECT IV E

DA TE

24

7.0 OTHER STUDIES

This FIS report either supersedes or is compatible with all previous studies on streams studied in this report and should be considered authoritative for purposes of the NFIP.

8.0 LOCATION OF DATA

Information concerning the pertinent data used in the preparation of this study can be obtained by contacting the Flood Insurance and Mitigation Division, Federal Emergency Management Agency, Region V, 536 S. Clark Street, 6th Floor, Chicago, IL 60605

9.0 BIBLIORAPHY AND REFERENCES

1. ---, Flood Insurance Study, City of Jasper, Indiana, April 1988. 2. “Population Counts, Estimates and Projections”, STATS Indiana, Indiana Business Research

Center, Indiana University Kelley School of Business, accessed at www.stats.indiana.edu/pop_totals_topic_page.html.

3. National Oceanic and Atmospheric Administration, National Climatic Data Center, Monthly

Station Normals of Temperature, Precipitation, and Heating and Cooling Days, 1971-2000, Climatography of the United States No. 81, 2002.

4. U.S. Army Corps of Engineers, HEC-2 Water-Surface Profiles Computer Program 723-X6,

L202A, Davis, California, November 1976. 5. U.S. Department of the Interior, Geological Survey, Water Resources Investigation 35-75,

Statistical Summaries of Indiana Streamflow Data, February 1976. 6. Indiana Flood Control Act of 1973, Chapter 318, Acts 1945 as found in IC-1971-13-2-22 and

amended by PL 122 Act 1973 and HEA 1156 Acts of 1976. 7. Indiana Flood Plain Act of 1973, PL 123 Act 1973, Senate Bill 75, (approved April 17, 1973). 8. Geobytes City Distance Tool. <http://www.geobytes.com/CityDistanceTool.htm>. 9. U.S. Geological Survey, Surface-Water Data for Indiana, Peak-Flow Data for Dubois County.

http://nwis.waterdata.usgs.gov/in/nwis/peak.

440

445

450 450

455 455

460 460

465 465

470 470

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN MILES ABOVE CONFLUENCE WITH MILL CREEK

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

CO

UN

TY

OF

DU

BO

IS,

INA

ND

IN

CO

RP

OR

AT

ED

AR

EA

S

FLO

OD

PR

OFI

LES

AC

KER

MA

N B

RA

NC

H

01P

A B C D E

F

G H

CO

NFL

UEN

CE W

ITH

MIL

L C

REEK

NO

RT

H R

OA

D

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

LEGEND

0.2% ANNUAL CHANCE FLOOD

1% ANNUAL CHANCE FLOOD



STREAM BED

CROSS SECTION LOCATION

1% ANNUAL CHANCE BACKWATER FROM MILL CREEK

435

440 440

445 445

450 450

455 455

460 460

1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN MILES ABOVE CONFLUENCE WITH PATOKA RIVER

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

CO

UN

TY

OF

DU

BO

IS,

INA

ND

IN

CO

RP

OR

AT

ED

AR

EA

S

FLO

OD

PR

OFI

LES

CR

OO

KED

CR

EEK

02P

A B C D

E

F

G

H I

J

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

WES

T 4

50

RO

AD

PR

IVA

TE R

OA

D

WES

T 4

00

RO

AD

CO

NFL U

EN

CE O

F E

VA

NS

BR

OO

K

CO

NFL U

EN

CE O

F S

HIL

OH

DR

AIN

LEGEND





STREAM BED


1% ANNUAL CHANCE BACKWATER FROM PATOKA RIVER

445

450 450

455 455

460 460

465 465

470 470

3.4 3.6 3.8 4.0 4.2

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

CO

UN

TY

OF

DU

BO

IS,

INA

ND

IN

CO

RP

OR

AT

ED

AR

EA

S

FLO

OD

PR

OFI

LES

CR

OO

KED

CR

EEK

03P

K

L

M N O P

ST

AT

E R

OU

TE 5

6

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

CO

NFLU

EN

CE O

F JA

SP

ER

DR

AIN

CR

OO

KED

CR

EEK

TR

IBU

TA

RY

LEGEND





STREAM BED


CO

NFLU

EN

CE O

F

455 455

460 460

465 465

470 470

0.00 0.05 0.10 0.15

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN MILES ABOVE CONFLUENCE WITH CROOKED CREEK

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

CO

UN

TY

OF

DU

BO

IS,

INA

ND

IN

CO

RP

OR

AT

ED

AR

EA

S

FLO

OD

PR

OFI

LES

CR

OO

KED

CR

EEK

TR

IBU

TA

RY

04P

A B C

CO

NFLU

EN

CE W

ITH

CR

OO

KED

CR

EEK

NO

RT

H 2

00

RO

AD

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

LEGEND





STREAM BED


455 455

460 460

465 465

470 470

475 475

0.0 0.1 0.2 0.3 0.4 0.5

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN MILES ABOVE CONFLUENCE WITH MILL CREEK

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

CO

UN

TY

OF

DU

BO

IS,

INA

ND

IN

CO

RP

OR

AT

ED

AR

EA

S

FLO

OD

PR

OFI

LES

GR

IST

RU

N

05P

A B C D E F G

CO

NFL

UEN

CE W

ITH

MIL

L C

REEK

WES

T 3

50

RO

AD

PR

IVA

TE D

RIV

E

PR

IVA

TE D

RIV

E

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

CIT

Y O

F J

AS

PER

EX

TR

AT

ER

RI T

OR

IAL

LIM

ITS

LEGEND





STREAM BED


440 440

445 445

450 450

455 455

460 460

465 465

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN MILES ABOVE CONFLUENCE WITH STRAIGHT RIVER

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

CO

UN

TY

OF

DU

BO

IS,

INA

ND

IN

CO

RP

OR

AT

ED

AR

EA

S

FLO

OD

PR

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LES

JA

HN

CR

EEK

06P

A B C D E F G

H

I

J

K L M

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

MER

IDIA

N R

OA

D

CIT

Y O

F J

AS

PER

CO

RP

OR

AT

E L

IMIT

S

LEGEND





STREAM BED


1% ANNUAL CHANCE BACKWATER FROM STRAIGHT RIVER

CO

NFLU

EN

CE W

ITH

ST

RA

I GH

T R

IVER

450

455 455

460 460

465 465

470 470

475 475

480 480

485 485

1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN MILES ABOVE CONFLUENCE WITH STRAIGHT RIVER

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

CO

UN

TY

OF

DU

BO

IS,

INA

ND

IN

CO

RP

OR

AT

ED

AR

EA

S

FLO

OD

PR

OFI

LES

JA

HN

CR

EEK

07P

N O

P

Q

P S T U V W

X

Y Z AA AB

AC

AD

AE

AF AG AH AI

HO

PE S

TR

EET

ST

AT

E R

OA

D 1

62

MER

IDIA

N R

OA

D

CED

AR

CR

ES

T C

OU

RT

TIM

BER

BR

OO

K C

OU

RT

MA

PLE

CR

ES

T B

OU

LEV

AR

D

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

LEGEND





STREAM BED


450

455 455

460 460

465 465

470 470

475 475

0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN MILES ABOVE CONFLUENCE WITH CROOKED CREEK

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

CO

UN

TY

OF

DU

BO

IS,

INA

ND

IN

CO

RP

OR

AT

ED

AR

EA

S

FLO

OD

PR

OFI

LES

JA

SP

ER

DR

AI N

08P

A B C D

CO

NFLU

EN

CE W

ITH

ST

. C

HA

RLE

S S

TR

EET

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

CR

OO

KED

CR

EEK

LEGEND





STREAM BED


440

450 450

460 460

470 470

480 480

490 490

3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN MILES ABOVE CONFLUENCE WITH EAST FORK WHITE RIVER

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

CO

UN

TY

OF

DU

BO

IS,

INA

ND

IN

CO

RP

OR

AT

ED

AR

EA

S

FLO

OD

PR

OFI

LES

MIL

L C

REEK

09P

A B C

D

E

F

G

H

I J K L M

PO

RT

ER

SV

ILLE

RO

AD

NO

RT

H 4

00

RO

AD

NO

RT

H 3

50

RO

AD

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

EX

TR

AT

ER

RIT

OR

IAL

LIM

ITS

BEG

INN

ING

OF

AC

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MA

N B

RA

NC

H P

RO

FILE

CO

NFLU

EN

CE O

F A

CK

ER

MA

N B

RA

NC

H

CO

NFL U

EN

CE O

F G

RIS

T R

UN

LEGEND





STREAM BED


1% ANNUAL CHANCE BACKWATER FROM EAST FORK WHITE RIVER

CIT

Y O

F J

AS

PER

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

425

430 430

435 435

440 440

445 445

450 450

455 455

460 460

465 465

78.0 78.5 79.0 79.5 80.0 80.5 81.0 81.5 82.0 82.5 83.0 83.5 84.0 84.5

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN MILES ABOVE MOUTH

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

CO

UN

TY

OF

DU

BO

IS,

INA

ND

IN

CO

RP

OR

AT

ED

AR

EA

S

FLO

OD

PR

OFI

LES

PA

TO

KA

RIV

ER

10P

A B C

D

E F

G

H

I J

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

CIT

Y O

F J

AS

PER

US

RO

UT

E 2

31

ST

AT

E R

OU

TE 4

5

SO

UT

HER

N R

AIL

WA

Y

EX

TR

AT

ER

RIT

OR

IAL

LIM

ITS

CO

NFLU

EN

CE O

F S

TR

AIG

HT

RIV

ER

LEGEND





STREAM BED


435

440 440

445 445

450 450

455 455

460 460

465 465

470 470

84.5 85.0 85.5 86.0 86.5 87.0 87.5 88.0 88.5 89.0 89.5 90.0 90.5 91.0

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN MILES ABOVE MOUTH

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

CO

UN

TY

OF

DU

BO

IS,

INA

ND

IN

CO

RP

OR

AT

ED

AR

EA

S

FLO

OD

PR

OFI

LES

PA

TO

KA

RIV

ER

11P

K L M

N

O P Q R S

T

U V W

X Y Z

ST

AT

E R

OU

TE 1

62

15

TH

ST

REET

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

CIT

Y O

F J

AS

PER

EX

TR

AT

ER

RI T

OR

IAL

LIM

ITS

CIT

Y O

F J

AS

PER

CO

RP

OR

AT

E L

IMIT

S

CIT

Y O

F J

AS

PER

CO

RP

OR

AT

E L

IMIT

S

CIT

Y O

F J

AS

PER

CO

RP

OR

AT

E L

IMIT

S

CO

NFL

UEN

CE O

F C

ALU

MET

RU

N

CO

NFL U

EN

CE O

F P

LAIN

DR

AIN

LEGEND





STREAM BED


430

435 435

440 440

445 445

450 450

455 455

460 460

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

CO

UN

TY

OF

DU

BO

IS,

INA

ND

IN

CO

RP

OR

AT

ED

AR

EA

S

FLO

OD

PR

OFI

LES

ST

RA

IGH

T R

IVER

12P

A B

C

CO

NFLU

EN

CE W

ITH

PA

TO

KA

RIV

ER

MER

IDIA

N R

OA

D

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

LEGEND





STREAM BED


CO

NFL

UEN

CE O

F JA

HN

CR

EEK

1% ANNUAL CHANCE BACKWATER FROM PATOKA RIVER

Documents

DUBOIS COUNTY, INDIANA · dubois county dubois county, indiana and incorporated areas community community name number *birdseye, town of 180608