FLOOD05487

• County: Gunnison
• Community: Crested Butte
• Stream Name: Coal Creek
• Basin: Gunnison
• Title: Floodplain Information Report
• Date: 9/18/1992
• Prepared For: Crested Butte
• Prepared By: RBD, Inc.
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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LEGEND

SPECIAL FLOOD HAZARD AREAS INUNDATED
BY 100,YEAR FLOOD
ZONe A No bue flood eJcViltions determined.

ZONE AE ibse flood elevations determined.

ZONE AH Flood depths of 1 to 3 (eet (usually VAS of
pondin.); bue flood elentions determined.

ZONE AD Flood depths of 1 to 3 feet (usu<llly sheet
flow on sloping tenolin); average depths
determined. for aren of illlu'Iial fan flood.
Ing. velocities also determined.

ZONE A99 To be PJ"otected (rom l00.ye.u flood by
Federal flood protection system under
constrUction; no blJe elentions determined.

CcnstJl flood with velocity h..nrd (wave
action); no bue flood elevations deter.
mined.

ZONE VE Coastal flood with velocity huud (Wolve
actiol1); bue flood elentions determined.

ZONE V

FLOODWAY AREAS IN ZONE AE

OTHER FLOOD AREAS
ZONE X Areas of SOa-year flood; areas of
1 DO-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.
OTHER AREAS
ZONE X Areas determined to be outside 500-
year flood plain.
ZONE 0 Areas in which flood hazard",are
undetermined.

Flood Boundary
Floodway Boundary
Zone 0 Boundary
Boundary Dividing Special Flood
Hazard Zones, and Boundary
Dividing Areas of Different
Coastal Base Flood Elevations
Within Special Flood Hazard
Zones.

-
-. .

Base Flood Elevation Line; Ele~
vation in Feet*

513

@---@

Cross Section line

IEL 9B7)

Base Flood Elevation in Feet
Where Uniform Within Zone*

RM7X

Elevation Reference Mark

*Referenced to the National Geodetic Vertical Datum of 1929

NOTES

Thi-s- ma~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 (IOO-year flood) include Zones A, AI-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 sedions 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 InSlorance Study Report.

Coastal base flood elevations apply only landward of the shoreline.

2.

Elevations reference marks are described in the Flood Insurance Study
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