FLOOD10751 ‎(2)‎

• County: Weld
• Community: Windsor
• Stream Name: Cache La Poudre River
• Title: LOMR - Affected Panel 0005 A - Case No. 04-08-0430P
• Date: 3/4/2005
• Prepared For: Windsor
• Prepared By: FEMA
• Floodplain - Doc Type: Historic FEMA Regulatory Floodplain Information

CHANGES ARE MADE IN DETERMINATIONS OF BASE FLOOD ELEVATIONS FOR THE
TOWN OF WINDSOR, WELD COUNTY, COLORADO, UNDER THE NATIONAL FLOOD
INSURANCE PROGRAM

On September 27, 1991, the Department of Homeland Security's Federal Emergency Management
Agency id,entified Special Flood Hazard Areas (SFHAs) in the Town of Windsor, Weld County,
Colorado, through issuance of a Flood msurance Rate Map (FIRM). 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 this community is appropriate. The
modified Base Flood Elevations (BFEs) revise the FIRM for the community.

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 msurance 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 for the Cache La Poudre River and the WCR17 - SH257 Divided
Flow to incorporate updated topographic information, floodway encroachments, and the effects of
placement of fill associated with construction of the Water Valley Development Project from just
upstream of State Highway 257 to approximately 1,000 feet upstream of Weld County Road 17. This has
resulted in a revised delineation of the regulatory floodway, increases and decreases in SFHA width, and
increased and decreased BFEs for the Cache La Poudre River and the WCR17 - SH257 Divided Flow.
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) *

Cache La Poudre River:
Approximately 3,000 feet upstream of
State Highway 257
Approximately 720 feet downstream of
County Road 17

4,750

4,751

4,761

4,762

WCR17 - SH257 Divided Flow:
Approximately 1,600 feet upstream of
State Highway 257
Approximately 80 feet downstream of
County Road 17

4,750

4,751

4,763

4,760

*National Geodetic Vertical Datum, rounded to nearest whole foot

Under the above-mentioned Acts of 1968 and 1973, the Mitigation Division must develop criteria for
floodplain management. To participate in the National Flood msurance 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