FLOOD10796 (2) - Laserfiche WebLink

Home Browse Search

CHANGES ARE MADE IN DETERMINATIONS OF BASE FLOOD ELEVATIONS FOR THE TOWN OF PIERCE AND THE UNINCORPORATED AREAS OF WELD COUNTY, COLORADO, UNDER THE NATIONAL FLOOD INSURANCE PROGRAM On November 15, 1979, September 28, 1982, and September 22, 1999, the Department of Homeland Security's Federal Emergency Management Agency identified Special Flood Hazard Areas (SFHAs) in the Town of Pierce and in the unincorporated areas of Weld County, Colorado, through issuance of Flood Insurance Rate Maps (FIRMs). The Mitigation Division has determined that modification of the elevations of the flood having a l-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. 400l-4128, and 44 CFR Part 65. A new hydraulic analysis was performed to incorporate the effects of a new hydrologic analysis and new topographic data along Spring Creek, Spring Creek Tributary, and Spring Creek Overflow. This has resulted in revised delineations of the regulatory floodways, increases and decreases in SFHA widths, and decreased BFEs for Spring Creek and Spring Creek Overflow and increases in SFHA width for Spring Creek Tributary. In addition, a regulatory floodway and BFEs were established for Spring Creek and Spring Creek Tributary in the unincorporated areas of Weld County. 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 Modified BFE (feet) * (feet) * None 5,029 None 5,054 None 5,002 None 5,035 None 5,Ol6 5,019 5,018 None 5,032 5,043 5,042 Spring Creek: 2Approximately 2,700 feet upstream of Weld County Road 88 2Approximately 1,800 feet upstream of U.S. Highway 85 Spring Creek Tributary: 2Just upstream of Weld County Road 88 2Just downstream of Rowe Avenue Spring Creek Overflow: 2Just upstream of Weld County Road 88 IApproximately 500 feet upstream of Weld County Road 88 2Approximately 3,000 feet upstream of Weld County Road 88 I Approximately 500 feet upstream of Park Avenue *National Geodetic Vertical Datum, rounded to nearest whole foot ITown of Pierce 2Unincorporated areas of Weld County Under the above-mentioned Acts of 1968 and 1973, the Mitigation Division 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.