FLOOD11020

• County: Arapahoe
• Community: Littleton
• Stream Name: Big Dry Creek Tributaries A, C
• Basin: South Platte
• Title: LOMR - Affected Panel 10D - Case No. 99-08-410P
• Date: 6/29/2000
• Prepared For: Littleton
• Prepared By: FEMA
• Floodplain - Doc Type: Historic FEMA Regulatory Floodplain Information

Federal Emergency Management Agency
Washington, D.C. 20472

FEB 2 3 2000

CERTIFIED MAIL
RETURN RECEIPT REQUESTED

IN REPLY REFER TO:
Case No.: 99-08-410P

The Honorable Susan Thornton
Mayor, City of Littleton
2255 West Berry Avenue
Littleton, CO 80165

Community: City of Littleton, Colorado
Community No.: 080017
Panels Mfected: 0010 D
Effective Date of J U N 2 9 2000
This Revision:

102-I-A-C

Dear Mayor Thornton:

'lhii responds to a request that the Federal Emergency Management Agency (FEMA) revise the effective
Flood Insurance Rate Map (FIRM) and Flood Insurance Study (PIS) report for your community in
accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated
August 18, 1999, Mr. Bill DeGroot, P.E., Chief, Floodplain Management Program, Urban Drainage and
Flood Control District, requested that FEMA revise the FIRM and FIS report to show the effects of
construction along Big Dry Creek of major drainageway features that consist of bank protection,
grade-control structures, crossing structures, and detention facilities, including Pond lOjust upstream of
South University Boulevard, and revised hydrologic and hydraulic analyses for Big Dry Creek Tributary A
and Big Dry Creek Tributary C.

All data required to complete our review of this request were submitted with letters from Mr. DeGroot and
. P.E., Project Manager, WRC Engineering, Inc.

We have completed our review of the submitted data and the flood data shown on the effective FIRM and
FIS report. We have revised the FIRM and FIS report to modify the elevations and floodplain and
floodway boundary delineations of the flood having a I-percent chance of being equaled or exceeded in
any given year (base flood) along Big Dry Creek from approximately 550 feet downstream of South
Santa Fe Drive tojust downstream of South Windermere Street; fromjust upstream of Belleview Avenue
to approximately 1,050 feet downstream of Lehow Avenue; from approximately 700 feet downstream to
just downstream of Lehow Avenue; fromjust upstream to approximately 700 feet upstream of Lehow
Avenue; and from approximately I,050feet downstream of Powers Avenue tojust downstream of West
Littleton Boulevard. As a result of the modifications, the base flood elevations (BFEs) for Big Dry Creek
and the widths of the Special Flood Hazard Area (SFHA), the area that would be inundated by the base
flood, and the regulatory floodway increased in some areas and decreased in other areas. The
modifications are shown on the enclosed annotated copies of FIRM Panel(s) 0010 D, Profile Panel(s) OIP
through 04P, and affected portions of the Summary of Discharges Table and Floodway Data Table. This
Letter of Map Revision (LOMR) hereby revises the above-referenced panel(s) of the effective FIRM and
the affected portions of the FIS report, both dated September 29, 1989.