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CHANGES ARE MADE IN DETERMINATIONS OF BASE FLOOD ELEVATIONS FOR THE CITIES OF COMMERCE CITY AND THORNTON AND THE UNINCORPORATED AREAS OF ADAMS COUNTY, COLORADO, UNDER THE NATIONAL FLOOD INSURANCE PROGRAM On August 16, 1995, the Federal Emergency Management Agency identified Sp,ecial Flood Hazard Areas (SFHAs) in the Cities of Commerce City and Thornton and in the unincorporated areas of Adams County, Colorado, through issuance of a Flood Insurance Rate Map (FIRM). Th€) Federal Insurance and Mitigation Administration has determined that modification of the elevations of the flood having a I-percent chance of being equaled or exceeded in any given year (base flood) for certain locations in this community is appropriate. The modified Base Flood Elevations (BFEs) r,evise the FIRM for the community. The changes are being made pursuant to Section 206 of the Flood Disaster Protection Act of 1973 (public Law 93-234) and are in accordance with the National Flood Insurance Act of 1968, as amended (Title XIII of the Housing and Urban Development Act of 1968, Public Law 90-448), 42 U.S.C. 4001-4128, and 44 CFR Part 65. A hydraulic analysis was performed to incorporate new topographic data for th(~ South Platte River from approximately 500 feet upstream of East 1 04th Avenue to approximately 3,100 feet downstream of East 88th Avenue and has resulted in a revised delineation of the regulatory floodway, increases and decreases in SFHA width, and increased and decreased BFEs for the South Platte River. The table below indicates existing and modified BFEs for selected locations along the affected lengths of the flooding source(s) cited above. Location Existing BFE (feet)* Modified BFE (feet)* 3 Approximately 100 feet downstream of East McKay Road 3 Approximately 2,000 feet upstream of East McKay Road 1,2,3 Approximately 4,000 feet downstream of East 88th Avenue 5,058 5,062 5,073 5,059 5,061 5,073 *National Geodetic Vertical Datum, rounded to nearest whole foot ICity of Commerce City 2City of Thornton 3Unincorporated areas of Adams County Under the above-mentioned Acts of 1968 and 1973, the Federal Insurance and Mitigation Administration must develop criteria for floodplain management. To participate in the National Flood Insurance Program (NFIP), the community must use the modified BFEs to administer the floodplain management measures of the NFIP. These modified BFEs will also be used to calculate the appropriate flood insurance premium rates for new buildings and their contents and for the second layer of insurance on existing buildings and contents. Upon the second publication of notice of these changes in this newspaper, any person has 90 days in which he or she can request, through the Chief Executive Officer of the community, that the Federal Insurance and Mitigation Administration reconsider the determination. Any n:quest for reconsideration must be based on knowledge of changed conditions or new scientific or technical data. All interested parties are on notice that until the 90-day period elapses, the Federal Insurance and Mitigation Administration's determination to modify the BFEs may itself be changed.