FLOOD04932

• County: Larimer
• Community: Fort Collins
• Stream Name: Cache La Poudre River
• Basin: South Platte
• Title: LOMR - Affected Panel 080102 0004 C, 0012 C, 0016 C - Case No. 99-08-307P
• Date: 12/22/1999
• Prepared For: Fort Collins
• 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.: 99-08- 307P

The Honorable Ray Martinez
Mayor, City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580

Community: City of Fort Collins, Colorado
Community No.: 080102
Panels Affected: 0004 C, 0012 C, and 0016 C
Ef~ective.~ate of DEe 22 1999
This RevIsIOn:

102-I-A-C

Dear Mayor Martinez:

This responds to a request that the Federal Emergency Management Agency (FEMA) revise 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
May 7, 1999. Ms. Marsha M. Hilmes, Floodplain Administrator, City of Fort Collins, requested that
FEMA revise the FIRM and FIS report to show the effects of a channelization and bridge and levee
construction project along the Cache La Poudre River. The project included extension of Timberline Road
across the Cache La Poudre River at approximately 4,900 feet upstream of Prospect Road; excavation of
the right channel bank from approximately 3,100 feet upstream to approximately 4,900 feet upstream of
Prospect Road; and construction of a levee along the right channel bank from approximately 6,300 feet
upstream to approximately 8,000 feet upstream of Prospect Road. This request follows up on a Conditional
Letter of Map Revision issued on December 12, 1997.

All data required to complete our review of this request were submitted with letters from Ms. Hihnes and
Mr. Gregory J, Koch, P.E., Project Manager, Anderson Consulting Engineers, 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 the Cache La Poudre River from just upstream of Prospect Road to just
upstream of Lemay Avenue and along Cache La Poudre LP A TH from just upstream of Prospect Road to
the point where it diverges from the Cache La Poudre River just downstream of the Timberline Road
Extension, As a result of the modifications, the base flood elevations (BFEs) for the revised reaches of the
Cache La Poudre River and Cache La Poudre LPATH 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 construction of the levee prevents the overland flow originating
from the Cache La Poudre River from entering the Cache La Poudre RPATH. As a result of the levee
construction and channelization, Cache La Poudre RP A TH and its associated flood hazards have been
eliminated. All property owners affected by the increases in BFEs were individually notified. The
modifications are shown on the enclosed annotated copies of FIRM Panel(s) 0004 C, 0012 C, and 0016
C; Profile Panel(s) 04P, 05P, 06P, 09P, and lOP; and affected portions of the Summary of Discharges
Table and Floodway Data Table. This Letter of Map Revision (LOMR) hereby revises the above-