FLOOD04529

• County: Logan
• Community: Sterling
• Stream Name: Pawnee Creek
• Basin: South Platte
• Title: CLOMR - Case 02-08-060R
• Date: 2/11/2002
• Prepared For: Sterling
• Prepared By: FEMA
• Floodplain - Doc Type: Historic FEMA Regulatory Floodplain Information

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Federal Emergency Management Agency
Washington, D.C. 20472

FEB 1 1 2002

CERTIFIED MAIL
RETURN RECEIPT REQUESTED

IN REPLY REFER TO:
Case No,: 02-08-060R

The Honorable Chip Steger
Mayor, City of Sterling
City Hall
P,O, Box 4000
Sterling, CO 80751

Community: City of Sterling, CO
Community No,: 080294

104

Dcar Mayor Steger:

This responds to a request that the Federal Emergency Management Agency (FEMA) comment on the
effects that a proposed project would have on the effective Flood Insurance Rate Map (FIRM) and Flood
Insurance Study (FIS) report for your community in accordance with Part 65 of the National Flood
Insurance Program (NFIP) regulations, In a letter dated November 13,2001, Mr. Ron Enserro, P,E.,
ICON Engineering, Inc" requested that FEMA evaluate the effects that the proposed Pawnee Creek
Overflow Interceptor Channel (proposed project), designed to collect the Pawnee Creek Overflow and
transport it directly to the South Platte River, would have on the flood hazard information shown on the
effective FIRM and FIS report. The proposed project will consist of approximately 12,000 linear feet of
grass-lined channel with a bottom width varying from 80 feet to 260 feet, a minimum side slope of3: I,
and a depth of approximately 7,0 feet. The proposed channel will be located in Logan County, just north
of County Road 22.5, and will parallel the road starting approximately 1,000 feet east ofthe west
boundary of Section 12 (Township 7 North, Range 53 West); crossing U.S, Highway 6 (US6) and the
Union Pacific Railroad (UPRR); and extending approximately 5,400 feet farther. The project also will
include two new bridges at the crossings of the UPRR and US6, respectively, Along the Pawnee Creek
Overflow, the boundary delineations of the Special Flood Hazard Area (SFHA), the area that would be
inundated by the flood having a I-percent chance of being equaled or exceeded in any given year (base
flood), shown on the effective FIRM are based on the report entitled "Flood Plain Information and
Drainage Plan for Sand Creek and the Pawnee Creek Overflow at Sterling, Colorado," prepared by
Resource Consultants Inc" dated May 1983. This report outlined the independent boundaries of the
SFHAs for the Pawnee Creek Overflow, Sand Creek, Pioneer Drainage Ditch, and the South Platte River.

All data required to complete our review of this request for a Conditional Letter of Map Revision
(CLOMR) were submitted with letters from Mr. Enserro.

Because this CLOMR request also affects the unincorporated areas of Logan County, a separate CLOMR
for that community was issued on the same date as this CLOMR,

We reviewed the submitted data and the data used to prepare the effective FIRM for your community and
determined that the proposed project meets the minimum floodplain management criteria of the NFIP.
We believe that, if the proposed project is constructed as shown on the submitted topographic work map
entitled "Pawnee Creek Overflow Interceptor Channel, Plan and Profile Workmap," prepared by ICON
Engineering, Inc" dated October 200 I, and the data listed below are received, a revision to the FIRM
would be warranted,