FLOOD09644

• County: Weld
• Community: Weld County and Unincorporated Areas
• Stream Name: Cache La Poudre River
• Basin: South Platte
• Title: LOMR - Affected Panel 080266 0628 C, 0636 C, 0637 , 0004 - Case No. 94-08-032P
• Date: 11/23/1994
• Prepared For: Weld County
• Prepared By: FEMA
• Floodplain - Doc Type: Historic FEMA Regulatory Floodplain Information

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Federal Emergency Management Agency
Washington, D.C. 20472

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CERTIFIED MAIL
RETURN RECEIPT REQUESTED

IN REPLY REFER TO:
Case No.: 94~08W032P

The Honorable W.H. Webster
Chairperson, Weld County
Board of Commissioners
P.O. Box 758
Greeley, Colorado 80632

community: Weld County,
Colorado
Community No.: 080266
Panels Affected: 0628 C, 0636 C,
0637 C, and 0004

Effective Date of
This Revision:

102-D-A

NOV 23 1994

Dear Mr. Webster:

This is in response to a request for a revision to the effective Flood
Insurance Study (FIS) and National Flood Insurance Program (NFIP) map for
your community. Specifically, this responds to a transmittal dated
November 29, 1993, from Mr. Robert A. Ferguson, Stormwater Department
Manager, Brown and Caldwell Consultants, regarding the effective FIS report,
Flood Insurance Rate Map (FIRM), and Flood Boundary and Floodway Map (FBFM)
for the unincorporated areas of Weld County, Colorado. Mr. Ferguson
requested that we revise the effective FIRM and FBFM to show the effects of
bridge reconstruction at Ash Avenue and 8th Street and more detailed
topographic information along the Cache La Poudre River from just downstream
of Ash Avenue to just upstream of 8th Street in the City of Greeley. A
separate Letter of Map Revision (LOMR) has been issued to describe
modifications to the effective FIS report, FIRM, and FBFM for the City of
Greeley.

All data required to complete our review of this request were submitted by
Mr. Ferguson with transmittals dated November 29, 1993, and February 10,
March 25, April 12, June 27, July 11, August 11, and September 12, 1994, and
with a letter dated January 20, 1994. Because this request is for public
benefit, fees were not assessed for the review.

We have completed our review of the submitted data and the flood data shown
on the effective FIRM and FBFM, and have revised the FIRM and FBFM to modify
the elevations and floodplain and flOodway boundary delineations of a flood
having a l-percent probability of being equaled or exceeded in any given year
(base flood) along the Cache La Poudre River from just downstream of
Ash Avenue upstream to 5th Street.

Our review of the available topographic and hydraulic data indicates that
approximately 35 percent of the base (lOO-year) flood discharge along the
Cache La Poudre River overtops the combined 8th Street and U.S. Highway 85
embankments in the vicinity of the City of Greeley Water pollution Control
Facility and flows along the low-lying area north of 8th Street. This area