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<br />CHANGES ARE MADE IN DETERMINATIONS OF BASE FLOOD ELEVATIONS FOR THE CITY
<br />OF WESTMINSTER, JEFFERSON COUNTY, COLORADO, UNDER THE NATIONAL FLOOD
<br />INSURANCE PROGRAM
<br />
<br />On June 17, 2003, the Department of Homeland Security's Federal Emergency Management Agency
<br />identified Special Flood Hazard Areas (SFHAs) in the City of Westminster, Jefferson County, Colorado,
<br />through issuance of a Flood Insurance Rate Map (FIRM). The Mitigation Division has determined that
<br />modification of the elevations of the flood having a I-percent chance of being equaled or exceeded in any
<br />given year (base flood) for certain locations in this community is appropriate. The modified Base Flood
<br />Elevations (BFEs) revise the FIRM for the community.
<br />
<br />The changes are being made pursuant to Section 206 of the Flood Disaster Protection Act of 1973 (Public
<br />Law 93-234) and are in accordance with the National Flood Insurance Act of 1968, as amended
<br />(Title XIII of the Housing and Urban Development Act of 1968, Public Law 90-448), 42 U.S.C.
<br />4001-4128, and 44 CFR Part 65.
<br />
<br />A hydraulic analysis was performed to incorporate the effects of changes along Big Dry Creek, including
<br />bridge modifications at U.S. Highway 36, 104th Avenue, 112th Avenue, and Sheridan Boulevard. This
<br />has resulted in a revised delineation of the regulatory floodway for Big Dry Creek, Airport Creek, South
<br />Branch Hylands Creek, North City Park Creek, South City Park Creek, South Cotton Creek, and North
<br />Cotton Creek; increases and decreases in SFHA width for Big Dry Creek and Airport Creek; decreases in
<br />SFHA width for South Branch Hylands Creek, North City Park Creek, South City Park Creek, North
<br />Cotton Creek, South Cotton Creek, and Walnut Creek; increased and decreased BFEs for Big Dry Creek;
<br />increased BFEs for South Branch Hylands Creek; and decreased BFEs for Airport Creek, Middle Cotton
<br />Creek, North Cotton Creek, North City Park Creek, and South City Park Creek. The table below
<br />indicates existing and modified BFEs for selected locations along the affected lengths of the flooding
<br />source(s) cited above.
<br />
<br /> Existing BFE Modified BFE
<br />Location (feet) * (feet) *
<br />Big Dry Creek:
<br />Approximatley 2,650 feet downstream of 104th Avenue 5,267 5,272
<br />Approximately 6,620 feet downstream of 104th Avenue 5,263 5,261
<br />Airport Creek:
<br />At confluence with Big Dry Creek 5,254 5,255
<br />Middle Cotton Creek:
<br />At confluence with Big Dry Creek 5,248 5,246
<br />Approximately 700 feet upstream of
<br />confluence with Big Dry Creek 5,248 5,247
<br />North Cotton Creek:
<br />At confluence with Big Dry Creek 5,248 5,246
<br />North City Park Creek:
<br />At confluence with Big Dry Creek 5,264 5,263
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