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<br />.,t, <br /> <br />,. <br /> <br /> <br />Federal Emergency Management Agency <br />Washington, D.C. 20472 <br /> <br />JUN 1 5 200It <br /> <br />CERTIFIED MAIL <br />RETURN RECEIPT REQUESTED <br /> <br />IN REPLY REFER TO: <br />Case No.: 03-08-0580P <br /> <br />The Honorable Julia Pinnack <br />Mayor, City of Longmont <br />350 Kimbark Street <br />Longmont, CO 80501 <br /> <br />Community: City of Longmont, CO <br />Community No,: 080027 <br />Panels Affected: 08013C0286 F, 0287 F, <br />0288 F, and 0289 F <br />En:ectiveI~ate of 0 CT 07 2004 <br />This Revmon: <br /> <br />102-I-A-C <br /> <br />Dear Mayor Pinnack: <br /> <br />This responds to a request that the Department of Homeland Security's Federal Emergency Management <br />Agency (FEMA) revise the effective Flood Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) <br />report for Boulder County, Colorado and Incorporated Areas (the effective FIRM and FIS report for your <br />commtmity), in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations, In a <br />letter dated August 1,2003, Mr, David Hollingsworth, P,E., Storm Drainage Engineer, Public Works <br />Division, Department of Community Development, City of Longmont, requested that FEMA revise the <br />FIRM and FIS report to show the effects of channelization, placement of fill, and construction of a new <br />bridge along Lefthand Creek and construction of a new bridge across St. Vrain Creek, all associated with <br />construction of Ken Pratt Boulevard. This request also included an updated hydraulic analysis that <br />incorporated more detailed topographic data for the following streams: <br /> <br />. Lefthand Creek from the confluence with St. Vrain Creek in Boulder County to just upstream of <br />South Main Street (V,S. Highway 287) in the City of Longrnont; <br />. St. Vrain Creek from approximately 160 feet upstream to approximately 7,200 feet upstream of <br />1 19th Street in Boulder County; <br />. Dry Creek No, I (Old Channel) from the confluence with St, Vrain Creek in Boulder County to <br />just upstream of Ken Pratt Boulevard in the City of Longmont; and <br />. Shallow flooding areas between Lefthand and St. Vrain Creeks from just upstream of Ken Pratt <br />Boulevard in Boulder County to just downstream of South Main Street in the City of Longmont. <br /> <br />All data required to complete our review of this request were submitted with letters from Mr. David C, <br />Webster, P,E" Water Resources Engineer, Floodplain Administrator, Transportation Department, Boulder <br />County; Mr, Mike Butters, P,E., Carter & Burgess; and Mr, Hollingsworth, <br /> <br />The improved channel along Lefthand Creek includes a low-flow channel and a wider flood channel. Ken <br />Pratt Boulevard crosses Lefthand Creek approximately 1,200 feet upstream of the confluence with <br />St. Vrain Creek. The bridge span is 172 feet, which includes one pier and spill-through abutments. A <br />bench for an 8-foot-wide bike trail is included on the slope for the north abutment. Ken Pratt Boulevard <br />