Federal Emergency Management Agency

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1 Page 1 of Issue Date: October Effective Date: March Case No.: P LOMR-APP Federal Emergency Management Agency Washington D.C LETTER OF MAP REVISION DETERMINATION DOCUMENT COMMUNITY AND REVISION INFORMATION PROJECT DESCRIPTION BASIS OF REQUEST COMMUNITY City of Rapid City Pennington County South Dakota BRIDGE CHANNELIZATION CULVERT BASE MAP CHANGES FLOODWAY HYDRAULIC ANALYSIS HYDROLOGIC ANALYSIS UPDATED TOPOGRAPHIC DATA COMMUNITY NO.: 20 IDENTIFIER South Canyon Creek Remapping ANNOTATED MAPPING ENCLOSURES APPROXIMATE LATITUDE AND LONGITUDE: SOURCE: USGS QUADRANGLE DATUM: NAD 83 ANNOTATED STUDY ENCLOSURES TYPE: FIRM* TYPE: FIRM* TYPE: FIRM* NO.: 103C07H NO.: 103C078H NO.: 103C079H DATE: June DATE: June DATE: June DATE OF EFFECTIVE FLOOD INSURANCE STUDY: June PROFILES: 123P 12P AND 12P FLOODWAY DATA TABLE: 7 SUMMARY OF DISCHARGES TABLE: Enclosures reflect changes to flooding sources affected by this revision. * FIRM - Flood Insurance Rate Map FLOODING SOURCE AND REVISED REACH South Canyon Creek from the confluence with Lime Creek to approximately 1030 feet upstream of South Canyon Road SUMMARY OF REVISIONS Flooding Source Effective Flooding Revised Flooding Increases Decreases South Canyon Creek Zone AE Zone AE YES YES Zone X (shaded Zone X (shaded YES YES BFEs* BFEs YES YES No Floodway Floodway YES NONE * BFEs - Base Flood Elevations DETERMINATION This document provides the determination from the Department of Homeland Security's Federal Emergency Management Agency (FEMA regarding a request for a Letter of Map Revision (LOMR for the area described above. Using the information submitted we have determined that a revision to the flood hazards depicted in the Flood Insurance Study (FIS report and/or National Flood Insurance Program (NFIP map is warranted. This document revises the effective NFIP map as indicated in the attached documentation. Please use the enclosed annotated map panels revised by this LOMR for floodplain management purposes and for all flood insurance policies and renewals in your community. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document please contact the FEMA Map Information exchange toll free at (1-877-FEMA MAP or by letter addressed to the LOMC Clearinghouse 87 South Pickett Street Alexandria VA Additional information about the NFIP is available on our website at Patrick Rick F. Sacbibit P.E. Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration P 102-I-A-C

2 Page 2 of Issue Date: October Effective Date: March Case No.: P LOMR-APP Federal Emergency Management Agency Washington D.C LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED OTHER COMMUNITIES AFFECTED BY THIS REVISION CID Number: 00 Name: Pennington County South Dakota AFFECTED MAP PANELS AFFECTED PORTIONS OF THE FLOOD INSURANCE STUDY REPORT TYPE: FIRM* TYPE: FIRM* NO.: 103C07H NO.: 103C078H DATE: June DATE: June DATE OF EFFECTIVE FLOOD INSURANCE STUDY : June PROFILES: 12P AND 12P FLOODWAY DATA TABLE: 7 SUMMARY OF DISCHARGES TABLE: This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document please contact the FEMA Map Information exchange toll free at (1-877-FEMA MAP or by letter addressed to the LOMC Clearinghouse 87 South Pickett Street Alexandria VA Additional information about the NFIP is available on our website at Patrick Rick F. Sacbibit P.E. Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration P 102-I-A-C

3 Page 3 of Issue Date: October Effective Date: March Case No.: P LOMR-APP Federal Emergency Management Agency Washington D.C LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED COMMUNITY INFORMATION APPLICABLE NFIP REGULATIONS/COMMUNITY OBLIGATION We have made this determination pursuant to Section 20 of the Flood Disaster Protection Act of 1973 (P.L and in accordance with the National Flood Insurance Act of 198 as amended (Title XIII of the Housing and Urban Development Act of 198 P.L U.S.C and CFR Part. Pursuant to Section 131 of the National Flood Insurance Act of 198 as amended communities participating in the NFIP are required to adopt and enforce floodplain management regulations that meet or exceed NFIP criteria. These criteria including adoption of the FIS report and FIRM and the modifications made by this LOMR are the minimum requirements for continued NFIP participation and do not supersede more stringent State/Commonwealth or local requirements to which the regulations apply. We provide the floodway designation to your community as a tool to regulate floodplain development. Therefore the floodway revision we have described in this letter while acceptable to us must also be acceptable to your community and adopted by appropriate community action as specified in Paragraph 0.3(d of the NFIP regulations. NFIP regulations Subparagraph 0.3(b(7 requires communities to ensure that the flood-carrying capacity within the altered or relocated portion of any watercourse is maintained. This provision is incorporated into your community s existing floodplain management ordinances; therefore responsibility for maintenance of the altered or relocated watercourse including any related appurtenances such as bridges culverts and other drainage structures rests with your community. We may request that your community submit a description and schedule of maintenance activities necessary to ensure this requirement. COMMUNITY REMINDERS We based this determination on the 1-percent-annual-chance discharges computed in the submitted hydrologic model. Future development of projects upstream could cause increased discharges which could cause increased flood hazards. A comprehensive restudy of your community s flood hazards would consider the cumulative effects of development on discharges and could therefore indicate that greater flood hazards exist in this area. Your community must regulate all proposed floodplain development and ensure that permits required by Federal and/or State/Commonwealth law have been obtained. State/Commonwealth or community officials based on knowledge of local conditions and in the interest of safety may set higher standards for construction or may limit development in floodplain areas. If your State/Commonwealth or community has adopted more restrictive or comprehensive floodplain management criteria those criteria take precedence over the minimum NFIP requirements. We will not print and distribute this LOMR to primary users such as local insurance agents or mortgage lenders; instead the community will serve as a repository for the new data. We encourage you to disseminate the information in this LOMR by preparing a news release for publication in your community's newspaper that describes the revision and explains how your community will provide the data and help interpret the NFIP maps. In that way interested persons such as property owners insurance agents and mortgage lenders can benefit from the information. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document please contact the FEMA Map Information exchange toll free at (1-877-FEMA MAP or by letter addressed to the LOMC Clearinghouse 87 South Pickett Street Alexandria VA Additional information about the NFIP is available on our website at Patrick Rick F. Sacbibit P.E. Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration P 102-I-A-C

4 Page of Issue Date: October Effective Date: March Case No.: P LOMR-APP Federal Emergency Management Agency Washington D.C LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED We have designated a Consultation Coordination Officer (CCO to assist your community. The CCO will be the primary liaison between your community and FEMA. For information regarding your CCO please contact: Ms. Jeanine D. Petterson Director Mitigation Division Federal Emergency Management Agency Region VIII Denver Federal Center Building 710 P.O. Box 227 Denver CO ( STATUS OF THE COMMUNITY NFIP MAPS We will not physically revise and republish the FIRM and FIS report for your community to reflect the modifications made by this LOMR at this time. When changes to the previously cited FIRM panels and FIS report warrant physical revision and republication in the future we will incorporate the modifications made by this LOMR at that time. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document please contact the FEMA Map Information exchange toll free at (1-877-FEMA MAP or by letter addressed to the LOMC Clearinghouse 87 South Pickett Street Alexandria VA Additional information about the NFIP is available on our website at Patrick Rick F. Sacbibit P.E. Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration P 102-I-A-C

5 Page of Issue Date: October Effective Date: March Case No.: P LOMR-APP Federal Emergency Management Agency Washington D.C LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED PUBLIC NOTIFICATION OF REVISION A notice of changes will be published in the Federal Register. This information also will be published in your local newspaper on or about the dates listed below and through FEMA s Flood Hazard Mapping website at LOCAL NEWSPAPER Name: Rapid City Journal Dates: November and November Within 90 days of the second publication in the local newspaper any interested party may request that we reconsider this determination. Any request for reconsideration must be based on scientific or technical data. Therefore this letter will be effective only after the 90-day appeal period has elapsed and we have resolved any appeals that we receive during this appeal period. Until this LOMR is effective the revised flood hazard determination presented in this LOMR may be changed. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document please contact the FEMA Map Information exchange toll free at (1-877-FEMA MAP or by letter addressed to the LOMC Clearinghouse 87 South Pickett Street Alexandria VA Additional information about the NFIP is available on our website at Patrick Rick F. Sacbibit P.E. Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration P 102-I-A-C

6 TABLE SUMMARY OF DISCHARGES TABLE (Cont d Drainage Area Peak Discharge (cfs Flooding Source and Location (square miles 10-percent 2-percent 1-percent 0.2-percent Rapid Creek through Rapid City (Cont d At Rapid City Downstream Study Limit At Rapid Creek East of Rapid City D/S Study Limits Rapid Creek Hisega to Pactola At Downstream Study Limits Red Rock Canyon Robinsdale Drain South Canyon Creek Southeast Drainage Basin.3 At Truck Bypass Confluence At Robinsdale Drain Confluence At Confluence With Rapid Creek Spring Creek At Hill City Study Limits Below Confluence with Newton Creek Truck Bypass Tributary 1 to East Tributary to Box Elder Creek Unnamed Tributary to Box Elder Creek At Downstream Study Limits March

7 TABLE - SUMMARY OF DISCHARGES TABLE (Cont d Flooding Source and Location Drainage Area (square miles 10-percent Peak Discharge (cfs 2-percent 1-percent 0.2-percent South Canyon Creek (continued Upstream of Berry Boulevard Downstream of Berry Boulevard Downstream of San Marco Boulevard Upstream of W. Chicago Street Downstream of W. Chicago Street Mouth of South Canyon Creek March [A]

8 FLOODING SOURCE CROSS SECTION DISTANCE 1 WIDTH (FEET FLOODWAY SECTION AREA (SQUARE FEET MEAN VELOCITY (FEET PER SECOND REGULATORY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER-SURFACE ELEVATION (FEET NAVD WITHOUT FLOODWAY WITH FLOODWAY INCREASE A B C D E F G H I J K L M N O P Feet Above Confluence with Lime Creek March TABLE 7 FEDERAL EMERGENCY MANAGEMENT AGENCY PENNINGTON COUNTY SD AND INCORPORATED AREAS FLOODWAY DATA SOUTH CANYON CREEK

9 ELEVATION IN FEET (NAVD 88 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH LIME CREEK CROSS SECTION LOCATION STREAM BED 10% ANNUAL CHANCE FLOOD % ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 0.2% ANNUAL CHANCE FLOOD LEGEND SOO SAN DR 38TH STREET 3RD STREET INTERSECTION OF S TH STREET AND W MAIN ST REVISED REACH 0 123P FEDERAL EMERGENCY MANAGEMENT AGENCY PENNINGTON COUNTY SD AND INCORPORATED AREAS FLOOD PROFILES SOUTH CANYON CREEK March

10 ELEVATION IN FEET (NAVD 88 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH LIME CREEK CROSS SECTION LOCATION STREAM BED 10% ANNUAL CHANCE FLOOD % ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 0.2% ANNUAL CHANCE FLOOD LEGEND CITY OF RAPID CITY PENNINGTON COUNTY W CHICAGO ST FOOTBRIDGE CAPITOL ST SAN MARCO BLVD PIERRE ST REVISED REACH 12P FEDERAL EMERGENCY MANAGEMENT AGENCY PENNINGTON COUNTY SD AND INCORPORATED AREAS FLOOD PROFILES SOUTH CANYON CREEK March

11 ELEVATION IN FEET (NAVD 88 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH LIME CREEK CROSS SECTION LOCATION STREAM BED 10% ANNUAL CHANCE FLOOD 80 2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 0.2% ANNUAL CHANCE FLOOD LEGEND REVISED REACH N BERRY PINE RD S CANYON RD LIMIT OF DETAILED STUDY P FEDERAL EMERGENCY MANAGEMENT AGENCY PENNINGTON COUNTY SD AND INCORPORATED AREAS FLOOD PROFILES SOUTH CANYON CREEK March

12 JOINS PANEL 072 Pennington County Unincorporated Areas 00 Unnamed Stream City of Rapid City m E '.0" 0'37." 000 FT South Canyon Creek SPECIAL FLOOD HAZARD AREAS OTHER AREAS OF FLOOD HAZARD SCALE Without Base Flood Elevation (BFE Zone AV A99 With BFE or Depth Zone AE AO AH VE AR Regulatory Floodway 0.2% Annual Chance Flood Hazard Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mile Zone X Future Conditions 1% Annual Chance Flood Hazard Zone X Area with Reduced Flood Risk due to Levee See Notes. Zone X 31 P City of Rapid City 20 Map Projection: NAD 1983 UTM Zone 13N; Western Hemisphere; Vertical Datum: NAVD 88 1 inch = 00 feet 1: Feet Meters ZONE A REVISED AREA S CANYON RD NATIONAL FLOOD INSURANCE PROGRAM FLOOD INSURANCE RATE MAP PENNINGTON COUNTY SOUTH DAKOTA and Incorporated Areas PANEL 7 OF 200 Panel Contains: COMMUNITY NUMBER PANEL SUFFIX PENNINGTON COUNTY RAPID CITY CITY OF H H South Canyon Creek JOINS PANEL 078 March VERSION NUMBER MAP NUMBER 103C07H EFFECTIVE DATE JUNE

13 E OO ME HALL STREET B E NORDBYE LANE RI V D RI ED LE VE BR OO D KSI D 3R DS T South Canyon Creek RC CI Culvert TH STREET H NORDBYE LN. C RIDGEWOOD STREET 38TH STR T. 1 N %-ANNUAL-CHANCE FLOOD DISCHARGE CONTAINED IN STRUCTURE W MAIN STREET 38TH STREET V NORDBYE LANE BASHAM RD W MAIN STREET 3372 Footbridge 1ST STREET IN STR E ET E BAL D W N PLATT STREET W OMAHA STREET F 2ND STREET RE T. 2 N PLEA SAN T D RI 12.2 N 39TH STR. R. ST N 0 T H W ST LOUIS STREET DR 338 RA YS I 0 1 N TH STREET STANLEY CT N CITY SPRINGS LANE M N 2N D R. ST K 0 G WEDGEWOOD DRIVE 3383 CLOVER ST. ST ET E 8 TH RE W CHICAGO STREET SE ST E A R IR EE E T WENTWORTH DRIVE ET Pennington County Unincorporated Areas 00 ST REVISED AREA G J O AD O W W P BEL AIRE DRIVE I SAN MARCO BOULEVA RD PLUMA DRIVE O 8 ROUBAIX DRIVE 1 2. H ST TH Y 33. O T IM 3387 O IT CA P MEADOWWOOD DR. Lime Creek 18 1%-ANNUAL-CHANCE FLOOD DISCHARGE CONTAINED IN STRUCTURE L NE South Canyon Creek Stream L N 8TH ST. LA AN D DE 08 CITY SPRINGS LN PIERRE ST Footbridge ed 38 CANDLEWOOD PLACE SAN MARCO BLVD. W CHICAGO STREET Un na m IV E RAY ANN CT City of Rapid City 20 ST MARTIN DRIVE %-ANNUAL-CHANCE FLOOD DISCHARGE CONTAINED IN STRUCTURE OA Lime Creek AD 83000m N 9. ER O 73.0 NR DR CITY SPRINGS CT AD P IN J VD BL Y YO R 3 RO R 73. AN KNUTSON LANE ER NB 1%-ANNUAL-CHANCE FLOOD DISCHARGE CONTAINED IN STRUCTURE Y RR 1%-ANNUAL-CHANCE FLOOD DISCHARGE CONTAINED IN STRUCTURE SC SO 000 FT IS K TRAIL.1 BE South Canyon Creek 8 ND DR I V City Park Walk 97.9 TIM BER LINE BELM ONT DR IVE 30.8 WI D G WAYSIDE DRIVE L '2." 0'37." UR m E ST N GALENA DRIVE m ea Str M Pennington County Unincorporated Areas 00 d 2 me na 31 8 Un '.0" 0'37." 3000m E MARY DR FT 82000m N Unnamed City of Rapid City 20 ea m tr S Un n am re St amed NOTE: MAP AREA SHOWN ON THIS PANEL IS LOCATED WITHIN TOWNSHIP 1 NORTH RANGE 7 EAST AND TOWNSHIP 2 NORTH RANGE 7 EAST. Unn a med Stream Pennington County Unincorporated Areas 00 U nn am e m d N Unna Stre am med Stre am FT 03'.0" 103 1'2." 03'.0" FT '.0" FLOOD HAZARD INFORMATION SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT Without Base Flood Elevation (BFE Zone AV A99 With BFE or Depth Zone AE AO AH VE AR SPECIAL FLOOD HAZARD AREAS Regulatory Floodway 0.2% Annual Chance Flood Hazard Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mile Zone X Future Conditions 1% Annual Chance Flood Hazard Zone X Area with Reduced Flood Risk due to Levee See Notes Zone X OTHER AREAS OF FLOOD HAZARD OTHER AREAS SCALE For information and questions about this map available products associated with this FIRM including historic versions of this FIRM how to order products or the National Flood Insurance Program in general please call the FEMA Map Information exchange at FEMA-MAP ( or visit the FEMA Map Service Center website at Available products may include previously issued Letters of Map Change a Flood Insurance Study Report and/or digital versions of this map. Many of these products can be ordered or obtained directly from the website. Users may determine the current map date for each FIRM panel by visiting the FEMA Map Service Center website or by calling the FEMA Map Information exchange. 1 inch = 00 feet Communities annexing land on adjacent FIRM panels must obtain a current copy of the adjacent panel as well as the current FIRM Index. These may be ordered directly from the Map Service Center at the number listed above. For community and countywide map dates refer to the Flood Insurance Study report for this jurisdiction. To determine if flood insurance is available in this community contact your Insurance agent or call the National Flood Insurance Program at Base map information shown on this FIRM was provided by the U.S. Census Bureau Geography Division 2009 Tiger/Line files. The coordinate system used for the production of the digital FIRM is Universal Transerse Mercator Zone 13N reference to the North American Datum of 1983 and the GRS spheroid Western Hemisphere. NATIONAL FLOOD INSURANCE PROGRAM Map Projection: Universal Transverse Mercator Zone 13N; North American Datum 1983; Western Hemisphere; Vertical Datum: NAVD 88 FLOOD INSURANCE RATE MAP 1: Feet Meters 00 PANEL LOCATOR PENNINGTON COUNTY SOUTH DAKOTA and Incorporated Areas PANEL 78 OF 200 Panel Contains: COMMUNITY PENNINGTON COUNTY RAPID CITY CITY OF PENNINGTON COUNTY NUMBER PANEL SUFFIX H H REVISED TO REFLECT LOMR EFFECTIVE: March NO SCREEN Area of Minimal Flood Hazard Zone X Area of Undetermined Flood Hazard Zone D Channel Culvert or Storm Sewer Levee Dike or Floodwall GENERAL STRUCTURES OTHER FEATURES NOTES TO USERS Cross Sections with 1% Annual Chance Water Surface Elevation (BFE Coastal Transect Coastal Transect Baseline Profile Baseline Hydrographic Feature Base Flood Elevation Line (BFE Limit of Study Jurisdiction Boundary LOGO LOGO VERSION NUMBER MAP NUMBER 103C078H EFFECTIVE DATE JUNE

14 PLATT STREET 3TH ST. LIME CREEK DR. 332 G H T. 2 N. T. 1 N. COUNTRY LN South Canyon Creek REVISED AREA m N JOINS PANEL 078 F W OMAHA STR. 37TH STREET HALL STR BR OOKSIDE Unnamed Stream LIME CREEK R. DRIVE Lime Creek 33 A REDER S TRE ET ZONE A STURGIS ROAD W OMAHA STR. 1%-ANNUAL-CHANCE FLOOD DISCHARGE CONTAINED IN STRUCTURE 3339 W MAIN STREET PAYTON CT W SOUTH ST SOO SAN DRIVE 332 HALL STREET 3329 E D SPECIAL FLOOD HAZARD AREAS OTHER AREAS OF FLOOD HAZARD SCALE Map Projection: NAD 1983 UTM Zone 13N; Western Hemisphere; Vertical Datum: NAVD 88 1 inch = 00 feet 1: Feet Meters NATIONAL FLOOD INSURANCE PROGRAM FLOOD INSURANCE RATE MAP PENNINGTON COUNTY SOUTH DAKOTA and Incorporated Areas PANEL 79 OF 200 Panel Contains: Without Base Flood Elevation (BFE Zone AV A99 With BFE or Depth Zone AE AO AH VE AR Regulatory Floodway 0.2% Annual Chance Flood Hazard Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mile Zone X Future Conditions 1% Annual Chance Flood Hazard Zone X Area with Reduced Flood Risk due to Levee See Notes. Zone X COMMUNITY NUMBER PANEL SUFFIX RAPID CITY CITY OF H City of Rapid City 20 March NOTE: MAP AREA SHOWN ON THIS PANEL IS LOCATED WITHIN TOWNSHIP 1 NORTH RANGE 7 EAST AND TOWNSHIP 2 NORTH RANGE 7 EAST. VERSION NUMBER MAP NUMBER 103C079H EFFECTIVE DATE JUNE