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~'. Federal Emergency Management Agency Washington, D.C. 20472 DEe 2 8 2000 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No,:iOQ-08-382P The Honorable Leona Stoecker Mayor, City ofLongmont 350 Kimbark Street Longmont, CO 80501 Community: City ofLongmont, CO Community No.: 080027 Panel Affected: 080 I3C0288 F E~ective.~ate of APR 2 5 2001 This ReVISIOn: 102-I-A-C Dear Mayor Stoecker: This responds to a request that the Federal Emergency Management Agency (FEMA) revise the effective Flood Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report for Boulder County, Colorado and Incorporated Areas (the effective FIRM and FIS report for your community), in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated August 17,2000, Mr. Mark A. Severin, P.E., Water Resources Engineer, Rocky Mountain Consultants, Inc., requested that FEMA revise the FIRM and FIS report to show the effects of construction of a bridge at Pike Road and more detailed topographic information for Lefthand Creek from approximately 400 feet downstream to approximately 1,000 feet upstream of Pike Road, All data required to complete our review of this request were submitted with letters from Mr. Severin. We have completed our review of the submitted data and the flood data shown on the effective FIRM and FIS report. We have revised the FIRM and FIS report to modify the elevations and floodway boundary delineations of the flood having a I-percent chance of being equaled or exceeded in any given year (base flood) along Lefthand Creek. As a result of the modifications, the Base Flood Elevations (BFEs) for Lefthand Creek increased in some areas and decreased in other areas, and a regulatory floodway WaS established from approximately 200 feet upstream to approximately 750 feet upstream of Pike Road. The width of the Special Flood Hazard Area (SFHA), the area that would be inundated by the base flood, did not change as a result of the project. The modifications are shown on the enclosed annotated copies of FIRM Panel 080I3C0288 F, Profile Pane1210P, and affected portions of the Floodway Data Table, This Letter of Map Revision (LOMR) hereby revises the above-referenced panel ofthe effective FIRM and the affected portions of the FIS report, both dated June 2, 1995, The following table is a partial listing of existing a1Id modified BFEs: Location Existing BFE (feet)* Modified BFE (feet)* Approximately 50 feet upstream offootbridge At Pike Road Approximately 250 feet upstream of Pike Road 4,972 4,975 4,976 4,973 4,974 4,974 *Referenced to the National Geodetic Vertical Datum, rounded to the nearest whole foot