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'. Federal Emergency Management Agency Washington, D.C. 20472 FEB 1 1 2002 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 02-08-060R The Honorable George A. Ed Chairman, Logan County Board of Commissioners 315 Main Street Sterling, CO 8075 I Community: Logan County, CO Community No.: 080110 104 De1r Mr. Etl: This responds to a request that the Federal Emergency Management Agency (FEMA) comment on the effects that a proposed project would have on the effective Flood Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report for your community in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated November 13, 2001, Mr. Ron Enserro, P.E., ICON Engineering, Inc., requested on behalf of the City of Sterling that FEMA evaluate the effects that the proposed Pawnee Creek Overflow Interceptor Channel (proposed project), designed to collect the Pawnee Creek Overflow and transport it directly to the South Platte River, would have on the flood hazard information shown on the effective FIRM and FIS report. The proposed project will consist of approximately 12,000 linear feet of grass-lined channel with a bottom width varying from 80 feet to 260 feet, a minimum side slope of 3: I, and a depth of approximately 7.0 feet. The proposed channel will be located in Logan County, just north of County Road 22.5, and will parallel the road starting approximately 1,000 feet east of the west boundary of Section 12 (Township 7 North, Range 53 West); crossing U.S. Highway 6 (US6) and the Union Pacific Railroad (UPRR); and extending approximately 5,400 feet farther. The project also will include two new bridges at the crossings ofthe UPRR and US6, respectively. Along the Pawnee Creek Overflow, the boundary delineations of the Special Flood Hazard Area (SFHA), the area that would be inundated by the flood having a I-percent chance of being equaled or exceeded in any given year (base flood), shown on the effective FIRM are based on the report entitled "Flood Plain Information and Drainage Plan for Sand Creek and the Pawnee Creek Overflow at Sterling, Colorado," prepared by Resource Consultants Inc., dated May 1983. This report outlined the independent boundaries of the SFHA& for the Pawnee Creek Overflow, Sand Creek, Pioneer Drainage Ditch, and the South Platte River. All data required to complete our review of this request for a Conditional Letter of Map Revision (CLOMR) were submitted with letters from Mr. Enserro. Because this CLOMR request also affects the City of Sterling, a separate CLOMR for that community was issued on the same date as this CLOMR. We reviewed the submitted data and the data used to prepare the effective FIRM for your community and determined that the proposed project meets the minimum floodplain management criteria of the NFIP. We believe that, if the proposed project is constructed as shown on the submitted topographic work map entitled "Pawnee Creek Overflow Interceptor Channel, Plan and Profile Workmap," prepared by ICON