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" I CHANGES ARE MADE IN DETERMINATIONS OF BASE FLOOD ELEVATIONS FOR THE CITY OF GRAND JUNCTION AND THE UNINCORPORATED AREAS OF MESA COUNTY, COLORADO, UNDER THE NATIONAL FLOOD INSURANCE PROGRAM On July 15, 1992, the Federal Emergency Management Agency identified Special Flood Hazard Areas (SFHAs) in the City of Grand Junction and in the unincorporated areas of Mesa County, Colorado, through issuance of Flood Insurance Rate Maps (FIRMs). The Mitigation Directorate 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 these communities is appropriate. The modified base flood elevations (BFEs) revise the FIRMs for the communities. 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 construction of a flood-control levee and several detention basins along the Colorado River from just upstream of the Denver and Rio Grande Western Railroad to approximately 2,750 feet upstream of U.S. Highway 50, also known as Fifth Street, and has resulted in a revised delineation of the regulatory floodway, a decrease in SFHA width, and increased and decreased BFEs for the Colorado River from just upstream of the Denver and Rio Grande Western Railroad to approximately 7,400 feet upstream of U.S. Highway 50. 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)" lJust downstream of U.S. Highway 50 1,2Approximately 3,150 feet downstream of U.S. Highway 50 1,2Approximately 4,100 feet downstream of U.S. Highway 50 4,564 4,569 4,570 4,565 4,570 4,571 "National Geodetic Vertical Datum, rounded to nearest whole foot ICity of Grand Junction 2Unincorporated areas of Mesa County Under the above-mentioned Acts of 1968 and 1973, the Mitigation Directorate 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 Mitigation Directorate reconsider the determination. Any request 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 Mitigation Directorate's determination to modify the BFEs may itself be changed.