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Federal Emergency Management Agency Washington, D.C. 20472 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No,: 02-08-082P The Honorable Jana L. Mendez Chairperson, Boulder County Board of Commissioners P,O, Box 471 Boulder, CO 80306-0471 Community: Boulder County, CO Community No,: 080023 Panel Affected: 08013C0270j' Effective Date of MAR 2 J 2002 This Revision: 102-I-A-C Dear Me Mendez: 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, in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations, In a letter dated November 28,200 1, Me David Hollingsworth, P.E., Storm Drainage Engineer, Public Works Division, Department of Community Development, City of Long mont, requested that FEMA revise the FIRM and FIS report to show the effects of a revised hydraulic analysis that incorporated updated topographic information, a new regulatory flood way , and a proj ect affecting both Dry Creek No, 1 and Clover Basin Tributary, The project consisted of realignment and channelization along Dry Creek No, 1 from approximately 1,450 feet downstream to just downstream of a private road (renamed Grandview Meadows Drive); construction of a new bicycle path bridge across Dry Creek No, 1 approximately 800 feet downstream of Grandview Meadows Drive; replacement of an existing culvert under the Grandview Meadows Drive crossing of Dry Creek No, 1 with an II-footby 1O-foot concrete box culvert and a 9-foot by 8-foot concrete box culvert; construction of a flood-detention basin along Dry Creek No, 1 approximately 600 feet upstream of Grandview Meadows Drive; and channelization along Clover Basin Tributary fromjust upstream to approximately 400 feet upstream of its confluence with Dry Creek No, L The area affected by this revision along Dry Creek No, 1 and Clover Basin Tributary is shown on effective FIRM Panel 08013C0270 F dated June 2, 1995, as modified by a Letter of Map Revision (LOMR) that was issued on June 19,1995 (Case No, 95-08-140P). This area is shown on the FIRM as a 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), designated Zone AE, where Base Flood Elevations (BFEs) have been determined, According to the submitted data, portions of this area were annexed by the City of Longmont The annexed areas included the southern half of Section 7 (Township 2 North, Range 69 West); the northwestern quarter of Section 18 (Township 2 North, Range 69 West); and the northeastern quarter of Section 13 (Township 2 North, Range 70 West), All data required to complete our review of this request were submitted with letters from Me Hollingsworth,