FLOOD11275

• County: Jefferson
• Community: Westminster
• Stream Name: CIty Park Channel
• Basin: South Platte
• Title: LOMR - Affected Panel 91E - Case No. 03-08-0645P
• Date: 8/19/2004
• Prepared For: Jefferson County
• Prepared By: FEMA
• Floodplain - Doc Type: Historic FEMA Regulatory Floodplain Information

CHANGES ARE MADE IN DETERMINATIONS OF BASE FLOOD ELEVATIONS FOR THE CITY
OF WESTMINSTER, ADAMS AND JEFFERSON COUNTIES, COLORADO, UNDER THE
NATIONAL FLOOD INSURANCE PROGRAM

On June 17, 2003, the Federal Emergency Management Agency identified Special Flood Hazard Areas
(SFHAs) in the City of Westminster, Adams and Jefferson Counties, Colorado, through issuance of a
Flood Insurance Rate Map (FIRM). The Mitigation Division 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 this community is appropriate. The modified Base Flood Elevations (BFEs)
revise the above-referenced FIRM for the community.

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 the Bradburn Village development along City Park
Channel from just upstream of West 120th Avenue to approximately 1,900 feet downstream of Sheridan
Boulevard. This has resulted in a revised delineation of the regulatory floodway, increases and decreases
in SFHA width, and increased and decreased BFEs for City Park Channel. We also revised the FIRM to
remove the BFEs and SFHA shown as the flooding effects of Nissen Reservoir Channel, located north of
City Park Channel along the south side of West 120th Avenue. The aforementioned channelized portion
of City Park Channel contains the base flood. 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) *

Approximately 150 feet upstream of West 120th Avenue
Approximately 2,200 feet downstream of Sheridan Boulevard

5,243
5,262

5,244
5,261

*National Geodetic Vertical Datum, rounded to nearest whole foot

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.

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
Division reconsider the detemlination. 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 Division's determination to modify the BFEs may itselfbe changed.

Any person having knowledge or wishing to comment on these changes should immediately notify:

The Honorable Ed Moss
Mayor, City of Westminster
4800 West 92nd Avenue
Westminster, CO 80031