FLOOD11725

• Designation Number: 87
• County: Garfield
• Community: Garfield County and Unincorporated Areas
• Basin: Colorado Mainstem
• Title: FIS - Garfield County and Unincorporated Areas
• Date: 2/1/1977
• Designation Date: 11/15/1978
• Floodplain - Doc Type: Historic FEMA Regulatory Floodplain Information

Zones A3, A4, A5, A6,
and A8:

Special flood hazard areas inundated by
the lOa-year flood, determined by
detailed methods; base flood elevations
shown, and zones subdivided according to
Flood Hazard Factors.

Zone B:

Areas between the special flood hazard
area and the limits of the 500-year
flood, including areas of the 500-year
flood plain that are protected from the
lOa-year flood by dike, levee, or other
water control structure; or areas
subject to certain types of lOa-year
shallow flooding where depths are less
than l.O foot. Zone B is not subdivided.

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Zone C:

Areas of minimal flooding.

Table 2, "Flood Insurance Zone Data," summarizes the flood elevation
differences, Flood Haza:cd Factors, flood insurance zones, and base
flood elevations for the segments of each flooding source studied in
detail in the county.

5.4 Flood Insurance Rate Map Description

The Flood Insurance Rate Map for the unincorporated areas of
Garfield County is, for insurance purposes, the principal result of
the Flood Insurance Study. This map (published separately) con-tains
the official delineation of flood insurance zones and base flood
elevation lines. Base flood elevation lines show the locations of
the expected whole-foot water-surface elevation of the base (lOO-
year) flood. This map j,s developed in accordance with the latest
flood insurance map preparation guidelines published by the Federal
Insurance Administration.

6.0 OTHER STUDIES

Reference 7 comprises an unplililished flood plain study of washes draining
Battlement Mesa at Grand Valley by Fraser and Gingery, Inc., Consulting
Engineers, Glenwood Springs. Its purpose was to provide data for design-
ing a subdivision that would be compatible with laO-year flood flows from
the washes. Flow data from t:he study were verified as being suitable and
were used in the present study to define the approximate limits of flooding
,. for the Battlement Mesa area. The study did not include profiles.

:.fI'

In 1973, the U.S. Army Corps of Engineers, Sacramento District, published
a Flood Plain Information report (Reference 8) on streams in the Rifle
area. The Colorado River and Hubbard Gulch were included in that report,

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