ARMSTRONG COUNTY, PENNSYLVANIA

ARMSTRONG COUNTY, PENNSYLVANIA (ALL JURISDICTIONS) Armstrong County COMMUNITY NAME COMMUNITY NUMBER APOLLO, BOROUGH OF 420092 APPLEWOLD, BOROUGH OF 420093 ATWOOD, BOROUGH OF 422297 BETHEL, TOWNSHIP OF 421300 BOGGS, TOWNSHIP OF 421301 BRADY S BEND, TOWNSHIP OF 421302 BURRELL, TOWNSHIP OF 421303 CADOGAN, TOWNSHIP OF 421304 COWANSHANNOCK, TOWNSHIP OF 421230 DAYTON, BOROUGH OF 421211 EAST FRANKLIN, TOWNSHIP OF 421305 COMMUNITY NAME COMMUNITY NUMBER ELDERTON, BOROUGH OF 422668 FORD CITY, BOROUGH OF 420094 PERRY, TOWNSHIP OF 422301 FORD CLIFF, BOROUGH OF 422669 PINE, TOWNSHIP OF 421312 FREEPORT, BOROUGH OF 420095 PLUMCREEK, TOWNSHIP OF 421313 GILPIN, TOWNSHIP OF 421306 RAYBURN, TOWNSHIP OF 421314 HOVEY, TOWNSHIP OF 422299 REDBANK, TOWNSHIP OF 421315 KISKIMINETAS, TOWNSHIP OF 421209 RURAL VALLEY, BOROUGH OF 422302 KITTANNING, BOROUGH OF 420096 SOUTH BEND, TOWNSHIP OF 421214 KITTANNING, TOWNSHIP OF 421307 SOUTH BETHLEHEM, BOROUGH OF 420100 LEECHBURG, BOROUGH OF 420097 SOUTH BUFFALO, TOWNSHIP OF 421210 MADISON, TOWNSHIP OF 421308 SUGARCREEK, TOWNSHIP OF 422303 MAHONING, TOWNSHIP OF 422633 VALLEY, TOWNSHIP OF 421316 MANOR, TOWNSHIP OF 421309 WASHINGTON, TOWNSHIP OF 421317 MANORVILLE, BOROUGH OF 420098 WAYNE, TOWNSHIP OF 421318 NORTH APOLLO, BOROUGH OF 422300 WEST FRANKLIN, TOWNSHIP OF 422304 NORTH BUFFALO, TOWNSHIP OF 421310 WEST KITTANNING, BOROUGH OF 422670 PARKER CITY, CITY OF 420099 WORTHINGTON, BOROUGH OF 422306 PARKS, TOWNSHIP OF 421311 FLOOD INSURANCE STUDY NUMBER 42005CV000A

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 (FIRM) panels for this community contain information that was previously shown separately on the corresponding Flood Boundary and Floodway Map (FBFM) panels (e.g., floodways, cross sections). In addition, former flood hazard zone designations have been changed as follows: Old Zone(s) Al through A30 B C New Zone AE X X Initial Countywide FIS Effective Date: To Be Determined

TABLE OF CONTENTS 1.0 INTRODUCTION... 1 1.1 Purpose of Study... 1 1.2 Authority and Acknowledgments... 1 1.3 Coordination... 4 2.0 AREA STUDIED... 6 2.1 Scope of Study... 6 2.2 Community Description... 7 2.3 Principal Flood Problems... 8 2.4 Flood Protection Measures... 10 3.0 ENGINEERING METHODS... 12 3.1 Hydrologic Analyses... 12 3.2 Hydraulic Analyses... 17 3.3 Vertical Datum... 21 4.0 FLOODPLAIN MANAGEMENT APPLICATIONS... 22 4.1 Floodplain Boundaries... 23 4.2 Floodways... 23 5.0 INSURANCE APPLICATIONS... 38 6.0 FLOOD INSURANCE RATE MAP... 39 7.0 OTHER STUDIES... 43 8.0 LOCATION OF DATA... 43 9.0 BIBLIOGRAPHY AND REFERENCES... 43 i

TABLE OF CONTENTS (Continued) FIGURES Figure 1 Floodway Schematic... 25 TABLES Table 1 Initial and Final CCO Meetings... 5 Table 2 Areas Studied by Detailed Methods... 6 Table 3 Floods of Record on the Allegheny River at Lock and Dam No. 4... 8 Table 4 Floods of Record on the Allegheny River at Lock and Dam No. 7... 9 Table 5 Flood Control Dams and Reservoirs... 10 Table 6 Summary of Discharges... 15 Table 7 Manning s n Values... 20 Table 8 Vertical Datum Conversion Values... 22 Table 9 Floodway Data... 26 Table 10 Community Map History... 40 EXHIBITS Exhibit 1 Flood Profiles Allegheny River Panels 01P 49P Buffalo Creek Panels 50P 54P Campbell Run Panel 55P Crooked Creek Panels 56P 60P Fort Run Panel 61P Garretts Run Panels 62P 64P Kiskiminetas River Panels 65P 74P Redbank Creek Panels 75P 77P Sugar Creek Panels 78P 82P Exhibit 2 Flood Insurance Rate Map Index Flood Insurance Rate Map ii

FLOODING SOURCE CROSS SECTION DISTANCE 1 WIDTH (FEET) SECTION AREA (SQUARE FEET) MEAN VELOCITY (FEET PER SECOND) REGULATORY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION WITHOUT WITH INCREASE (FEET) Allegheny River (Continued) AN 222,398 826 26,604 8.1 788.9 788.9 789.1 0.2 AO 223,898 940 27,133 7.9 789.3 789.3 789.5 0.2 AP 225,548 1,270 29,880 7.2 790.0 790.0 790.2 0.2 AQ 226,418 1,360 37,389 5.8 790.5 790.5 790.7 0.2 AR 228,018 1,334 38,198 5.6 790.9 790.9 791.1 0.2 AS 229,518 942 30,227 7.1 791.0 791.0 791.2 0.2 AT 231,418 828 29,167 7.4 791.4 791.4 791.6 0.2 AU 231,715 714 24,970 8.6 791.4 791.4 791.6 0.2 AV 233,165 693 22,861 9.4 791.4 791.4 791.7 0.3 AW 234,665 889 24,987 8.6 792.1 792.1 792.4 0.3 AX 236,861 890 27,758 7.8 793.2 793.2 793.9 0.7 AY 242,880 1,392 39,260 5.5 798.5 798.5 798.7 0.2 AZ 245,784 828 26,883 8.0 798.6 798.6 798.8 0.2 BA 249,216 990 30,833 7.0 799.4 799.4 799.7 0.3 BB 253,440 1,035 30,808 7.0 800.4 800.4 800.5 0.1 BC 350,123 739/374 2 23,332 7.4 837.8 837.8 837.9 0.1 BD 358,435 721/340 2 23,461 7.4 839.0 839.0 839.1 0.1 BE 363,131 671/224 2 20,013 8.6 839.7 839.7 839.9 0.2 BF 367,404 735/326 2 21,424 8.2 841.3 841.3 841.5 0.2 1 Feet above confluence with the Ohio River 2 Width / width within county limits TABLE 9 FEDERAL EMERGENCY MANAGEMENT AGENCY ARMSTRONG COUNTY, PA (ALL JURISDICTIONS) DATA ALLEGHENY RIVER 28

FLOODING SOURCE CROSS SECTION DISTANCE 1 WIDTH2 (FEET) SECTION AREA (SQUARE FEET) MEAN VELOCITY (FEET PER SECOND) REGULATORY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION WITHOUT WITH INCREASE (FEET) Allegheny River (Continued) BG 367,648 762/378 21,526 8.1 841.4 841.4 841.6 0.2 BH 370,163 972/556 26,548 6.5 842.5 842.5 842.7 0.2 BI 373,526 803/367 20,956 8.3 843.0 843.0 843.3 0.3 BJ 377,842 679/291 19,881 8.7 845.2 845.2 845.6 0.4 BK 443,120 1,178/630 23,680 7.3 869.3 869.3 869.9 0.6 BL 452,196 656/263 16,070 9.4 872.5 872.5 872.9 0.4 BM 458,085 666/354 16,980 8.9 876.1 876.1 876.4 0.3 BN 462,582 504/279 13,879 10.9 878.4 878.4 878.7 0.3 BO 465,925 664/382 16,988 8.9 880.5 880.5 880.8 0.3 1 Feet above confluence with the Ohio River 2 Width / width within county limits TABLE 9 FEDERAL EMERGENCY MANAGEMENT AGENCY ARMSTRONG COUNTY, PA (ALL JURISDICTIONS) DATA ALLEGHENY RIVER 29

FLOODING SOURCE CROSS SECTION DISTANCE WIDTH (FEET) SECTION AREA (SQUARE FEET) MEAN VELOCITY (FEET PER SECOND) REGULATORY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION WITHOUT WITH INCREASE (FEET) Buffalo Creek (Continued) AO 21,809 1 439 3,005 4.0 864.5 864.5 865.2 0.7 AP 22,809 1 244 1,708 7.0 865.8 865.8 866.5 0.7 AQ 23,459 1 242 1,578 7.4 867.6 867.6 868.4 0.8 AR 24,469 1 349 2,905 4.0 871.0 871.0 871.8 0.8 AS 25,119 1 171 1,780 6.5 871.7 871.7 872.4 0.7 Campbell Run A 385 2 123 475 3.2 786.6 786.0 787.0 0.4 B 634 2 115 329 4.7 788.0 788.0 788.6 0.6 C 889 2 88 239 6.4 791.4 791.4 791.6 0.2 D 1,119 2 118 228 6.7 794.9 794.9 794.9 0.0 E 1,279 2 43 277 5.5 798.2 798.2 799.1 0.9 F 1,559 2 36 173 8.9 801.9 801.9 802.1 0.2 G 2,327 2 42 196 7.8 815.1 815.1 815.1 0.0 1 Feet above county boundary 2 Feet above confluence with Crooked Creek TABLE 9 FEDERAL EMERGENCY MANAGEMENT AGENCY ARMSTRONG COUNTY, PA (ALL JURISDICTIONS) DATA BUFFALO CREEK AND CAMPBELL RUN 32

FLOODING SOURCE CROSS SECTION DISTANCE 1 WIDTH2 (FEET) SECTION AREA (SQUARE FEET) MEAN VELOCITY (FEET PER SECOND) REGULATORY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION WITHOUT WITH INCREASE (FEET) Redbank Creek A 123,170 207/89 3,877 10.9 1,061.0 1,061.0 1,061.8 0.8 B 124,811 195/107 3,432 12.3 1,062.6 1,062.6 1,063.1 0.5 C 126,997 491/255 7,742 5.5 1,067.7 1,067.7 1,068.7 0.9 D 127,737 647/509 10,793 3.9 1,068.1 1,068.1 1,069.1 0.9 E 129,478 397/255 7,185 5.9 1,068.5 1,068.4 1,069.4 0.9 F 130,619 299/225 6,002 7.0 1,068.9 1,068.9 1,069.7 0.7 G 131,709 283/134 5,446 7.8 1,069.1 1,069.1 1,070.0 0.9 H 133,385 447/349 6,932 6.1 1,070.1 1,070.1 1,070.8 0.7 1 Feet above confluence with the Allegheny River 2 Width / width within county limits TABLE 9 FEDERAL EMERGENCY MANAGEMENT AGENCY ARMSTRONG COUNTY, PA (ALL JURISDICTIONS) DATA REDBANK CREEK 37