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CHANGES ARE MADE IN DETERMINATIONS OF BASE FLOOD ELEVATIONS FOR THE CITY OF GOLDEN AND THE UNINCORPORATED AREAS OF JEFFERSON COUNTY, COLORADO, UNDER THE NATIONAL FLOOD INSURANCE PROGRAM The Federal Emergency Management Agency identified Special Flood Hazard Areas (SFHAs) in the City of Golden on May 15, 1985, and in the unincorporated areas of Jefferson County, Colorado, on August 5, 1986, through issuance of Flood Insurance Rate Maps (FIRMs), The Mitigation Directorate has detennined 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 perfonned to incorporate construction of a trapezoidal channel from Wyoming Street to State Highway 93 (SH93), two 66,inch,diameter reinforced,concrete pipe (RCP) culverts under SH93, and a 90,inch-diameter RCP culvert that increases to a 96-inch-diameter RCP culvert under Pine Ridge Drive, The revised reach extends from Wyoming Street to approximately 600 feet upstream of SH93. The modifications have resulted in an increase and decrease in SFHA width and increased and decreased BFEs for the revised reach of Cressmans Gulch, The aforementioned channelized portion of the revised reach contains the combined base flood discharges from Cressmans Gulch and Cressmans Gulch Old Channel. 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)* I Approximately 100 feet upstream of Wyoming Street I Approximately 350 feet upstream of Wyoming Street 'Approximately 450 feet upstream of Wyoming Street 2 Approximately 600 feet upstream of SH93 5,924 5,934 None None 5,924 5,932 5,941 6,011 ICity of Golden 'Unincorporated areas of Jefferson County *National Geodetic Vertical Datum, rounded to nearest whole foot 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,