FLOOD10993

• County: Arapahoe
• Community: Littleton
• Stream Name: Big Dry Creek
• Basin: South Platte
• Title: LOMR - Affected Panel 10D - Case No. 06-08-B392P
• Date: 7/13/2007
• Prepared For: Littleton
• Prepared By: FEMA
• Floodplain - Doc Type: Historic FEMA Regulatory Floodplain Information

CHANGES ARE MADE IN DETERMINATIONS OF BASE FLOOD ELEVATIONS FOR THE
CITIES OF ENGLEWOOD AND LITTLETON, COLORADO, UNDER THE NATIONAL FLOOD
INSURANCE PROGRAM

On August 16, 1995, and September 29, 1989, respectively, the Department of Homeland Security's
Federal Emergency Management Agency identified Special Flood Hazard Areas (SFHAs) in the City of
Englewood and the City of Littleton, Colorado, through issuance of Flood Insurance Rate Maps (FIRMs).
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
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 performed to incorporate the effects of channel improvements, construction of
the Regional Transportation District Light Rail Bridge, replacement of the Windermere Street bridge, and
construction of a floodwall along Big Dry Creek from the confluence with the South Platte River to
approximately 170 feet downstream of West Belleview Avenue. This has resulted in a revised delineation
of the regulatory floodway, increases and decreases in SFHA width, and increased and decreased BFEs
for Big Dry Creek. 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) *

2 Just downstream of South Santa Fe Drive
2Just upstream of Denver and Rio Grande Western Railroad
I Approximately 310 feet upstream of South Windermere Street
I Approximately 460 feet upstream of South Windermere Street

5,318
5,328
5,331
5,333

5,317
5,326
5,330
5,334

*National Geodetic Vertical Datum, rounded to nearest whole foot
ICity of Englewood
2City of Littleton

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 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 Division's determination to modify the BFEs may itself be changed.