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Home My WebLink About20180307.tiffFederal Emergency Management Agency Washington, D.C. 20472 CERTIFIED MAIL RETURN RECEIPT REQUESTED The Honorable Julie Cozad Chair, Board of Commissioners, Weld County 1150 O Street P.O. Box 758 Greeley, CO 80631 Dear Ms. Cozad: January 16, 2018 IN REPLY REFER TO: Case No.: 17-08-1597R Community Name: Weld County, CO Community No.: 080266 RECEIVED JAN 222018 WELD COUNTY COMMISSIONERS We are providing our comments with the enclosed Conditional Letter of Map Revision (CLOMR) on a proposed project within your community that, if constructed as proposed, could revise the effective Flood Insurance Study report and Flood Insurance Rate Maps for your community. If you have any questions regarding the floodplain management regulations for your community, the National Flood Insurance Program (NFIP) in general, or technical questions regarding this CLOMR, please contact the Director, Mitigation Division of the Federal Emergency Management Agency (FEMA) Regional Office in Denver, Colorado, at (303) 235-4830, or the FEMA Map Information eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP). Additional information about the NFIP is available on our website at http://www.fema.gov/nfip. Sincerely, 60. Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration List of Enclosures: Conditional Letter of Map Revision Comment Document cc: The Honorable Dave Bernhardt Chairman, Board of Commissioners, Town of Milliken Mr. Tom Parko Jr. Director Planning Services Weld County Mr. Troy Spraker Town Engineer Town of Milliken Ms. Stephanie DiBetitto, CFM State NFIP Coordinator Colorado Water Conservation Board Cornrwun; co,+;or1S 01/ act ft 8' Mr. Charlton Kennedy, P.E. Water Resources Engineer AECOM CC: ©bin CUZlt), PL(mn1 /TP), 1W UN) CA (FN) 0l -2s -t8 2018-0307 Page 1 of 7 'Issue Date: January 16, 2018 'Case No.: 17-08-1597R CLOMR-APP Z "' Federal Emergency O Washington, Management Agency D.C. 20472 441vD s CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT COMMUNITY INFORMATION PROPOSED PROJECT DESCRIPTION BASIS OF CONDITIONAL REQUEST COMMUNITY Weld County Colorado (Unincorporated Areas) FILL BRIDGE CHANNELIZATION CHANNEL RELOCATION HYDRAULIC ANALYSIS HYDROLOGIC ANALYSIS NEW TOPOGRAPHIC DATA FLOODWAY BASE MAP CHANGES UPDATE COMMUNITY NO.: 080266 IDENTIFIER STATE HIGHWAY 60 & STATE HIGHWAY 257 BRIDGE REPLACEMENT & LITTLE THOMPSON RIVER CHANNELIZATION PROJECT APPROXIMATE LATITUDE A LONGITUDE: 40.328, -104.858 SOURCE: Google Earth DATUM: NAD 83 AFFECTED MAP PANELS TYPE: FIRM* NO.: 0812301684E DATE: January 20, 2016 TYPE: FIRM NO.: 08123C1703E DATE: January 20, 2016 * FIRM - Flood Insurance Rate Map FLOODING SOURCE AND REACH DESCRIPTION Little Thompson River — From the confluence with Big Thompson River to approximately 5,600 feet upstream of State Highway 60 Western Thompson and Platte Ditch - From just upstream of South Katheleen Avenue to approximately 800 feet upstream of State Highway 257 Railroad Split- From approximately 200 feet upstream of North Josephine Avenue to just downstream of the Great Western Railroad PROPOSED PROJECT DESCRIPTION Flooding Source Proposed Project Location of Proposed Project Little Thompson River Bridge Modification Bridge replacement along State Highway 60 and State Highway 257 From just downstream of State Highway 60 to just upstream of State Highway 257 Channel Relocation From just downstream of State Highway 60 to just upstream of State Highway 257 Channelization Fill Upstream and downstream of State Highway 60 and State Highway 257 SUMMARY OF IMPACTS TO FLOOD HAZARD DATA Flooding Source Effective Flooding Proposed Flooding Increases Decreases Little Thompson River Zone AE Zone AE Yes None BFEs* BFEs Yes Yes Zone X (shaded) Zone X (shaded) Yes Yes Floodway Floodway Yes None * BFEs - Base (1 -percent -annual -chance) Flood Elevations COMMENT This document provides the Federal Emergency Management Agency's (FEMA's) comment regarding a request for a CLOMR for the project described above. This document is not a final determination; it only provides our comment on the proposed project in relation to the flood hazard information shown on the effective National Flood Insurance Program (NFIP) map. We reviewed the submitted data and the data used to prepare the effective flood hazard information for your community and determined that the proposed project meets the minimum floodplain management criteria of the NFIP. Your community is responsible for approving all floodplain development and for ensuring that all permits required by Federal or State/Commonwealth law have been received. State/Commonwealth, county, and community officials, based on their knowledge of local conditions and in the interest of safety, may set higher standards for construction in the Special Flood Hazard Area (SFHA), the area subject to inundation by the base flood). If the State/Commonwealth; county, or community has adopted more restrictive or comprehensive floodplain management criteria, these criteria take precedence over the minimum NFIP criteria. This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Map Information eXchange (FMIX) toll free at 1-877- 336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at http://www.fema.gov/nfip. Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 17-08-1597R 104 Page 2 of 7 'Issue Date: January 16, 2018 'Case No.: 17-08-1597R I CLOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) ADDITIONAL FLOODING SOURCES AFFECTED BY THIS CONDITIONAL REQUEST SUMMPRY OF IMPACTS TO FLOOD HAZARD DATA Flooding Source Western Thompson and Platte Ditch Railroad Split Effective Flooding Proposed Flooding Increases Decreases Zone X (shaded) Zone AE Yes None Zone AE Zone AE Yes None No BFEs BFEs Yes None Zone X (unshaded) Zone AE Yes None No BFEs BFEs Yes None This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Map Information eXchange (FMIX) toll free at 1-877-336-2&27 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at http://www.fema.gov/nfip. Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 17-08-1597R 104 Page 3 of 7 'Issue Date: January 16, 2018 Case No.: 17-08-1597R I CLOMR-APP yA 744, °" Federal Emergency Management a` Washington, D.C. 20472 Agency CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) OTHER COMMUNITIES AFFECTED BY THIS CONDITIONAL REQUEST CID Number: 080187 Name: Town of Milliken, CO AFFECTED MAP PANELS TYPE: FIRM NO.: 08123C1684E DATE: January 20, 2016 TYPE: FIRM NO.: 08123C1703E DATE: January 20, 2016 This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Map Information eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website athttp://www.fema.gov/nfip. 4X,-/4/ Patrick "Rick° F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 17-08-1597R 104 Page 4 of 7 'Issue Date: January 16, 2018 (Case No.: 17-08-1597R CLOMR-APP Federal Emergency Management Agency D.C. 20472 at QF4A O"' io.Washington, 4'�tND St. CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION To determine the changes in flood hazards that will be caused by the proposed project, we compared the hydraulic modeling reflecting the proposed project (referred to as the proposed conditions model) to the hydraulic modeling used to prepare the Flood Insurance Study (FIS) (referred to as the effective model). If the effective model does not provide enough detail to evaluate the effects of the proposed project, an existing conditions model must be developed to provide this detail. The existing conditions and the proposed conditions models were not compared to the effective model due to the proposed changes in hydrology that resulted in three fold increase to the effective flows along Little Thompson River. The table below shows the changes in the BFEs: BFE Comparison Table Flooding Source: Little Thompson River BFE Change (feet) Location of maximum change Proposed vs. Existing Maximum increase 1.2 Approximately 500 feet downstream of State Highway 257 Maximum decrease 3:3 Just upstream of State Highway 257 Flooding Source: Western Thompson and Platte Ditch BFE Change (feet) Proposed vs. Existing Maximum increase 0.2 Just upstream of South Katheleen Avenue Maximum decrease 1.3 Approximately 800 feet upstream of State Highway 257 Flooding Source: Railroad Split BFE Change (feet) Proposed vs. Existing Maximum increase 0.3 Approximately 1,550 feet downstream of State Highway 257 Maximum decrease 0.3 Just downstream of State Highway 257 Increases due to the proposed project that exceed those permitted under Paragraphs (c)(10) or (d)(3) of Section 60.3 of the NFIP regulations must adhere to Section 65.12 of the NFIP regulations. With this request, your community has complied with all requirements of Paragraph 65.12(a) of the NFIP regulations. Compliance with Paragraph 65.12(b) also is necessary before FEMA can issue a Letter of Map Revision when a community proposes to permit encroachments into the effective floodway that will cause BFE increases in excess of those permitted under Paragraph 60.3(d)(3). NFIP regulations Subparagraph 60.3(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. This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Map Information eXchange (FMIX) toll free at 1-877- 336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at http://www.fema.gov/nfip. Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 17-08-1597R 104 Page 5 of 7 Ilssue Date: January 16, 2018 (Case No.: 17-08-1597R CLOMR-APP OA)RT\E A QFederal Emergency Management Agency Washington, D.C. 20472 'IN SVC CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) DATA REQUIRED FOR FOLLOW-UP LOMR Upon completion of the project, your community must submit the data listed below and request that we make a fmal determination on revising the effective FIRM and FIS report. If the project is built as proposed and the data below are received, a revision to the FIRM and FIS report would be warranted. • Form 1, entitled "Overview & Concurrence Form". Detailed application and certification forms must be used for requesting final revisions to the maps. Therefore, when the map revision request for the area covered by this letter is submitted, Form 1 must be included. If as -built conditions differ from the proposed plans, please submit new forms, which may be accessed at http://www.fema.gov/plan/prevent/fhm/dl_mt-2.shtm, or annotated copies of the previously submitted forms showing the revised information. • Form 2, entitled "Riverine Hydrology & Hydraulics Form" • Form 3, entitled "Riverine Structures Form" • Hydraulic analyses, for as -built conditions, of the base flood; the 10 -percent, 2 -percent, and 0.2 percent annual chance floods, and floodway together with a topographic work map showing the revised floodplain boundaries. Please ensure that the revised information ties in with the current effective information at the downstream and upstream ends of the revised reach. • Annotated copies of the FIRMS, at the scale of the effective FIRMS, that shows the revised floodplain and floodway boundary delineations shown on the submitted work map and how they tie into the floodplain and floodway boundary delineations shown on the current effective FIRM at the downstream and upstream ends of the revised reach • As -built plans, certified by a registered professional engineer, of all proposed project elements • Documentation of the individual legal notices sent to property owners who will be affected by any widening/shifting of the base floodplain and/or any BFE increases along Little Thompson River, Western Thompson and Platte Ditch, and Railroad Split. • Evidence that your community has, prior to approval of the proposed encroachment, adopted floodplain management ordinances that incorporate the increased BFEs and revised floodplain boundary delineations to reflect the post -project conditions, as stated in Paragraph 65.12(b) This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Map Information eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at http:/Nvww.fema.gov/nfip. -4/1 Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 17-08-1597R 104 Page 6 of 7 Issue Date: January 16, 2018 (Case No.: 17-08-1597R CLOMR-APP � Federal Emergency Management Agency Washington, D.C. 20472 ND St' CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) • A letter stating that your community will adopt and enforce the modified regulatory floodway, OR, if the State/Commonwealth has jurisdiction over either the regulatory floodway or its adoption by your community, a copy of your community's letter to the appropriate State/Commonwealth agency notifying it of the modification to the regulatory floodway and a copy of the letter from that agency stating its approval of the modification • FEMA's fee schedule for reviewing and processing requests for conditional and final modifications to published flood information and maps may be accessed at http://www.fema.gov/plan/prevent/flim/frm_fees.shtm. The fee at the time of the map revision submittal must be received before we can begin processing the request. Payment of this fee can be made through a check or money order, made payable in U.S. funds to the National Flood Insurance Program, or by credit card (Visa or MasterCard only). Please forward the payment, along with the revision application, to the following address: LOMC Clearinghouse 36+01 Eisenhower Avenue, Suite 500 Alexandria, VA 22304-6426 After receiving appropriate documentation to show that the project has been completed, FEMA will initiate a revision to the FIRMs and FIS report. Because the flood hazard information (i.e., base flood elevations, base flood depths, SFHAs, zone designations, and/or regulatory floodways) will change as a result of the project, a 90 -day appeal period will be initiated for the revision, during which community officials and interested persons may appeal the revised flood hazard information based on scientific or technical data. This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Map Information eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to tie LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at http:llwww.fema.gov/nfip. Ohl- -4/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 17-08-1597R 104 f Page 7 of 7 Issue Date: January 16, 2018 Case No.: 17-08-1597R CLOMR-APP ti4A-T..B 0 67. ° " Federal Emergency Management Agency ° t Washington, D.C. 20472 41m s CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) COMMUNITY REMINDERS 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 25267 Denver, CO 80225-0267 (303) 235-4830 This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Map Information eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at http:/Mww.fema.gov/nfip. Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 17-08-1597R 104 Hello