FLOOD04473

• County: Logan
• Community: Logan County and Unincorporated Areas
• Basin: South Platte
• Title: FIRM - Logan County and Unincorporated Areas - Panel 245B
• Date: 9/29/1989
• Prepared For: Logan County
• Prepared By: FEMA
• Floodplain - Doc Type: Current FEMA Regulatory Floodplain Information

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LEND

SPECIAL FLOOD HAZARD AREAS INUNDATED
BY 100-YEAR FLOOD
ZONE A No base flood elevations determined.

ZONE AE Base flood elevations determined,

ZONE AH Flood depths of 1 to 3 feet (usually areas of
ponding); base flood elevations determined.

ZONE AO Flood depths of 1 to 3 feet (usually sheet
flow on sloping terrain); average depths
determined. For areas of alluvial fan flood-
ing, velocities also determined.

ZONE A99 To be protected from 100-year flood by
Federal fl(}od protection system under
construction; no base elevations determined.

ZONE V Coastal flood with velocity hazard (wave
action); no base flood elevations deter-
mined.

ZONE VE Coastal flood with velocity hazard (wave
action); base flood elevations determinpd.

FLOODWAY AREAS IN ZONE AE

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OTHER FLOOD AREAS

ZONE X Areas of SOO-year flood; areas of
100-year flood with average depths
of less than 1 foot or with drainage
areas less than 1 square mile; and
areas protected by levees from 100-
year flood.

I OTHER AREAS

ZONE X Areas determined to be outside 500-
year flood plain.

ZONE 0 Areas in which flood hazards are
u ndeterm ined.

Flood Boundary

Floodway Boundary

Zone D Boundary

Boundary Dividing Special Flood
Hazard Zones, and Boundary
Dividing Areas of Different
Coastal Base Flood Elevations
Within Special Flood Hazard
Zones.

.- r- -- 513

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Base Flood Elevation Line; Ele-
vation in Feet*

Cross Section Line

(EL 987)

Base Flood Elevation in Feet
Where Uniform Within Zone*

RM7X

Elevation Reference Mark

*Referenced to the National Geodetic Vertical Datum of 1929

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NOTES

This map is for use in administering the National Flood Insurance
Program; it does not necessarily identify all areas subject to flOOding.
particularly from local drainage sources of small size, or all planimetric
features outside Special Flood Hazard Areas.

Areas of special flood hazard (lOO-yearflood) include Zones A, Al-30,
AE, AH, AO, A99, V, Vl-30 AND VE.

Certain areas not in Special Flood Hazard Areas may be protected by
flood control structures.

Boundaries of the floodways were computed at cross sections and
interpolated between cross sections. The floodways were based on
hydraulic considerations with regard to requirements of the Federal
Emergency Management Agency.

Floodway widths in some areas may be too narrow to show to scale.
Floodway widths are provided in the Flood Insurance Study Report.

Coastal base flood elevations apply only landward of the shoreline.

Elevations reference marks are described in the Flood Insurance Study
Report.

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For adjoining map panels see separately printed Map Index

MAP REPOSITORY
Office of Zoning Administrator
Logan County Courthouse
300 Ash Street
Sterling, Colorado 80757
(Maps available for reference only, not for distribution.)
INITIAL IDENTIFICATION:

APRIL 4, 1978

FLOOD HAZARD BOUNDARY MAP REVISIONS:

FLOOD INSURANCE RATE MAP EFFECTIVE:
SEPTEMBER 29, 1989

FLOOD INSURANCE RATE MAP REVISIONS:

Refer to the FLOOD INSU RANCE RATE MAP EFFECTIVE date
shown on this map to determine when actuarial rates apply to
structures in the zones where elevations or depths have been estab-
lished.

To determine if flood insurance is available, contact an insurance
agent or call the National Flood Insurance Program at (800)
638-6620.

.

APPROXIMATE SCALE IN FE
1000 0 1000

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. NA T10NAL FLOOD

II

FIR

GAN

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(SEE MAP INDEX FOR

PANEL LOCATION

COMMUNITY.P ANEl NUMBER
080110 02458

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EFFECTIVE DATE:
SEPTEMBER 29, 1989

Federal Emergency Management Agency