Federal Emergency Management Agency. Washington, D.C August 14,2014

Transcription

1 August 14,2014 CERTIFIED MAIL RETURN RECEIPT REQUESTED The Honorable Greg Chilcott Chairman, Ravalli County Board of Commissioners 215 South 4th Street, Suite A Hamilton, MT IN REPLY REFER TO: Case No.: Community Name: Community No.: Effective Date of This Revision: P Ravalli County, MT January 19,2015 Dear Mr. Chilcott: The Flood Insurance Study report and Flood Insurance Rate Map for your community have been revised by this Letter of Map Revision (LOMR). Please use the enclosed annotated map panel(s) revised by this LOMR for floodplain management purposes and for all flood insurance policies and renewals issued in your community. Additional documents are enclosed which provide information regarding this LOMR. Please see the List of Enclosures below to determine which documents are included. Other attachments specific to this request may be included as referenced in the Determination Document. If you have any questions regarding floodplain management regulations for your community or the National Flood Insurance Program (NFIP) in general, please contact the Consultation Coordination Officer for your community. If you have any technical questions regarding this LOMR, please contact the Director, Mitigation Division of the Department of Ilomeland Security's Federal Emergency Management Agency (FEMA) in Denver, Colorado, at (303) , or the FEMA Map Infomiation exchange toll free at l (I-877-FEMA MAP). Additional information about the NFIP is available on our website at Sincerely, Luis Rodriguez, P.E., Chief Federal Insurance and Mitigation Administration List of Enclosures: Letter of Map Revision Determination Document Annotated Flood Insurance Rate Map Annotated Flood Insurance Study Report RECEIVED AUG N Ravalli County Commissioners CL '&&" ^' cc: Mr. Eric Anderson, P.E. Floodplain Administrator Ravalli County Mr. Joseph Smith, P.E., LSIT Project Engineer Morrison Maierle, Inc. Mr. Paul Barteni Daly Ditches Irrigation District

2 Page 1 of4 Issue Date: August 14,2014 Effective Date: January 19,2015 Case No.: P LOMR-APP DETERMINATION DOCUMENT COMMUNITY AND REVISION INFORMATION PROJECT DESCRIPTION BASIS OF REQUEST COMMUNITY Ravalli County Montana (Unincorporated Areas) DAM HYDRAULIC ANALYSIS NEW TOPOGRAPHIC DATA COMMUNITY NO.: IDENTIFIER Daly Ditches ANNOTATED MAPPING ENCLOSURES APPROXIMATE LATITUDE & LONGITUDE: , SOURCE: USGS QUADRANGLE DATUM: NAD 83 ANNOTATED STUDY ENCLOSURES TYPE: FIRM* NO.: 30081C0860D DATE: January DATEOF EFFECTIVE FLOOD INSURANCESTUDY: January 16, 2015 PROFILE(S): 11P DATA TABLE: 5 Enclosures reflect changes to flooding sources affected by this revision. * FIRM- Flood Insurance Rate Map:" FBFM - Flood Boundaryand Floodway Map; *" FHBM- Rood Hazard Boundary Map FLOODING SOURCE(S) & REVISED REACH(ES) Bitterroot River - from approximately 6,410 feet downstream to approximately 14,070 feet downstream of Old Darby Road SUMMARY OF REVISIONS Flooding Source Effective Flooding Revised Flooding Increases Decreases Bitterroot River Zone AE BFEs* Floodway Zone AE BFEs Floodway ' BFEs - Base Flood Elevations DETERMINATION This document provides the determination from the Department of Homeland Security's (FEMA) regarding a request fora Letterof Map Revision (LOMR) forthe area described above. Usingthe 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 LOMRfor floodplain management purposes and for all flood insurance policies and renewals in your community. Thisdetermination Is based on the flooddata presently available. The enclosed documents provideadditional infomiation regarding this determination. Ifyou have any questions about this document, please contact the FEMA Map Information exchange tollfree at (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse,847 South Pickett Street, Alexandria, VA Additional Information about the NFIPis available on our website at -^ Lv:.> Luis Rodriguez. P.E., Chief Federal Insurance and Mitigation Administration PT202.BKR P.H l-A-C

3 Page 2 of4 Issue Date: August 14,2014 Effective Date: January 19,2015 Case No.: P LOMR-APP,'Ztmfci DETERMINATION DOCUMENT (CONTINUED) COMMUNITY INFORMATION APPLICABLE NFIP REGULATIONS/COMMUNITY OBLIGATION We have made this determination pursuantto Section 206 ofthe Flood DisasterProtection Act of 1973(P.L ) and in accordance with the National Flood Insurance Act of 1968, as amended (Title XIII ofthe Housing and Urban Development Act of 1968, P.L ), 42 U.S.C , and 44 CFR Part65. Pursuant to Section 1361 ofthe National Flood Insurance Act of 1968, as amended, communities participating in the NFIP arerequired to adopt and enforce floodplain managementregulations that meet or exceed NFIP criteria. These criteria, including adoption ofthe FIS report and FIRM, and the modifications made by this LOMR, are the minimum requirements for continued NFIP participation and do not supersede morestringent 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 adoptedby appropriate community action, as specified in Paragraph 60.3(d) ofthe NFIP regulations. COMMUNITY REMINDERS We based thisdetermination on the 1-percent-annual-chance flood discharges computed in the FIS foryourcommunity withoutconsidering subsequent changes in watershed characteristics thatcould increase flood discharges. Future development ofprojects upstream could causeincreased flood discharges, which could cause increased flood hazards. A comprehensive restudy ofyour community's flood hazards would considerthe cumulative effects ofdevelopment on flood discharges subsequent to the publication ofthe FIS report for your communityandcould,therefore, establish greater flood hazards in this area. Your community must regulate all proposed floodplain development andensure that permits required by Federal and/or State/Commonwealth law have been obtained. State/Commonwealth or community officials, based on knowledge oflocalconditionsand inthe interest ofsafety,may set higher standards for construction ormay limit development in floodplain areas. If your State/Commonwealth or community hasadopted morerestrictive orcomprehensive floodplain management criteria, thosecriteria take precedence overthe minimumnfip requirements. We will notprint and distribute this LOMR to primary users, such aslocal insurance agents ormortgage lenders; instead, thecommunity will serve as arepository for thenewdata. We encourage youto disseminate theinformation inthislomrby preparing anews release for publication inyour community's newspaper that describes therevision and explains howyour community will provide thedata 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. Thisdetermination is based on the flood data presently available. Theencloseddocumentsprovide additional information regarding thisdetermination. Ifyouhaveany questions aboutthis document, pleasecontact the FEMA Map Information exchangetoil freeat (1-877-FEMA MAP) or byletteraddressed tothelomc Clearinghouse, 847South Pickett Street,Alexandria, VA Additional Information aboutthe NFIP is available on ourwebsite at Luis Rodriguez, P.E., Chief Federal Insurance andmitigation Administration 132g42 PT202.BKR P.H l-A-C

4 Page'3 of 4 ' Issue Date: August 14,2014 Effective Date: January 19, 2015 Case No.: P LOMR-APP ^^ DETERMINATION DOCUMENT (CONTINUED) We have designated aconsultation Coordination Officer (CCO) to assist your community. your community andfema. For information regarding yourcco, please contact: TheCCO will betheprimary liaison between Ms. Jeanine D. Petterson Director, Mitigation Division, Region VIII Denver Federal Center, Building 710 P.O. Box Denver, CO (303) STATUS OF THE COMMUNITY NFIP MAPS We are processinga revised countywide FIRM and FIS report for Ravalli County, MT and Incorporated Areas. The revised countywide FIRM, which includes flood hazard information for your community, will become effective on January 16,2015. Because the effective datehas already been established,we will not incorporate the modificationsmade by this LOMR into the countywide FIRM beforethey become effective. However, the modifications made by this LOMR will supersede the countywide FIRM after it becomes effective. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions aboutthisdocument, pleasecontactthe FEMA Map Information exchange toll free at (1-877-FEMA MAP) orby letteraddressedtothe LOMC Clearinghouse. 847 South PickettStreet. Alexandria. VA Additional Information about the NFIP is available on ourwebsite at / => -_-==r ^> C. ~> Luis Rodriguez, P.E.. Chief Federal Insurance and Mitigation Administration PT202.BKR P.H l-A-C

5 Page'4 of4' ' Issue Date: August 14,2014 Effective Date: January 19,2015 Case No.: P LOMR-APP DETERMINATION DOCUMENT (CONTINUED) PUBLIC NOTIFICATION OF REVISION A notice ofchanges will be published in the Federal Register. This information also will be published in your localnewspaper on or about the dateslistedbelow and through FEMA's Flood Hazard Mappingwebsite at main.asp. LOCAL NEWSPAPER Name: The Ravalli Republic Dates: August 22,2014 and August 29,2014 Within 90 daysofthe second publication in the local newspaper, a citizenmay request thatwe reconsider this determination. Any request forreconsiderationmust be based on scientific or technical data. Therefore, this letter will be effective on January 19,2015, only after the 90-day appeal period has elapsed and we have resolved any appeals that we receive during thisappeal period. Until this LOMR is effective, the revised flood hazard determination information presented in this LOMR may be changed. This determination isbasedonthe flood datapresently available. The enclosed documents provide additional information regarding thisdetermination. Ifyouhaveany questions about this document, please contact thefema Map Information exchange toll free at (1-877-FEMA MAP) orbyletter addressed tothe LOMC Clearinghouse. 847 South Pickett Street. Alexandria, VA Additional Information about thenfip isavailable onour website athttp7aivww.fema.gov/nfip. c _ J> Luis Rodriguez, P.E., Chief Federal Insurance and MitigationAdministration PT202.BKR P.H l-A-C

6 < FLOODING SOURCE CROSS SECTION DISTANCE1 WIDTH (FEET) SECTION AREA (SQUARE FEET) MEAN VELOCITY (FEET PER SECOND) REGULATORY (FEET NAVD) 1-PERCENT ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION WITHOUT (FEET NAVD) WITH (FEET NAVD) INCREASE (FEET) Bitterroot River (Continued) BV 205, , , , , BW 208, , , , , BX 208, , , , , BY 212, , , , , BZ 216,270 1, , , , CA 218,270 1,305 4, , , , CB ,615 4, , CC , , , CD , , , , REVISED CE , , DATA CF 234, , , , \ CG 239, , , X CH ,850 5, , , , CI 245, , , , , CJ , CK 253, , , , , CL 256, , , , , CM , , , , CN 257, , , CO 261, , , , CP 263, , CQ 266, , , , , CR 268, , , , , CS 273,270 1,291 4, , , , 'Feet Above County Boundary "^Map Top Width Not Equ al Due to Redel neation > 03 r~ m en FEDERAL EMERGENCY MANAGEMENT AGEN(:y RAVALLI COUNTY, MT AND INCORPORATED AREAS REVISED TO DATAeflect lomr BITTERROOT RIVER EFFECTIVE: Januarv

7 c Bitterroot River 0.2% Annual Chance Flood Hazard. Areas of 1% annual chance flood with aw rage depth less than one foot or withdrainage areas of less than one square mile i Future Conditions 1% Annual Chance Rood Hazard v;!;;, WSSi ^'"f^ucednoodriskduetolevee see Notes. Utp Protection NAD83 STATE PLANE Msnurj FIPS 2500 (Fwt) WetMm Hemttpntre; Vertctl D«1um; NP 1 Inch -1,000 feet 1: &0. y xv^v1 MltcKomrliiVi _ Baseline W^h^W <? E NATIONAL ROOD INSURANCE PROGRAM RAVALU COUNTY, MONTANA AM) PiCOAFORMED AR AS k»u860 w 1725?NOTE: MAPAgEASHOWN'ONTHIS.PANEL IS LOCATED 'WITHIN TOWNSHIP 4 NORTH, RANGE 20 WEST AND TOWNSHIR.4 NORTH, RANGE.2"1 WEST. O o COMMUNITY NUMBER PANEL SUFFU r*.*uicol*tt xcoei ow) d ZONEAE v Ravalli County Unincorporated Areas c o REVISED TO REFLECT LOMR EFFECTIVE:January19,2015 VERSION NUMBER MAP NUMBER 30081C08600 MAP REVISED JANUARY