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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 On May 15, 1985, and August 5, 1986, the Federal Emergency Management Agency identified Special Flood Hazard Areas (SFHAs) in the City of Golden and the Unincorporated Areas of Jefferson County, Colorado, respectively, through issuance of a Flood Insurance Rate Map (FIRM). 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 two communities is appropriate, The modified base flood elevations (BFEs) revise the FIRMs for these 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 XIIl 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 existing channel and bridge improvements along Lena Gulch that were completed prior to the issuance of the effective FIRM for the City of Golden and the unincorporated areas of Jefferson County, Colorado. The channel improvements included the construction of a concrete-lined channel from just upstream of West Sixth Avenue to jnst downstream of 17301 West Colfax Street, regrading of the channel banks from just upstream of 17301 West Colfax Street to Violet Street, and the replacement of the Violet Street and 17301 West Colfax Street bridges and has resulted in a revised delineation of the regulatory floodway, and SFHA, and change in BFEs for upstream of West Sixth Avenue to just downstream of the Amoco Driveway, 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)* City of Golden, Colorado: Just upstream of West Sixth Avenue Approximately 160 feet downstream of 17031 West Colfax Street 5,928 5,926 5,953 5,948 Jefferson County, Colorado: Approximately 500 feet upstream of West Sixth Avenue 5,942 5,937 *National Geodetic Venical 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,