FLOOD10612 ‎(2)‎

• County: Boulder
• Community: Boulder County and Incorporated Areas
• Title: FIRM - Boulder County and Incorporated Areas - Panel 577H
• Date: 10/4/2002
• Prepared For: Boulder County
• Prepared By: FEMA
• Floodplain - Doc Type: Current FEMA Regulatory Floodplain Information

NOTES

TO

USERS

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. The community map repository should be
consulted for possible updated or additional flood hazard information.

1 05 005 '37.5 "
40000'00"

To obtain more detailed information in areas where Base Flood Elevation
(BFEs) and/or floodways have been determined, users are encouraged to consult
the Flood Profiles and Floodway Data tables contained within the Flood Insur-
ance Study (FIS) report that accompanies this FIRM. Users should be aware that
BFEs shown on the FIRM represent rounded whole-foot elevations. These BFEs
are intended for flood insurance rating purposes only and should not be used
as the sole source of flood elevation information. Accordingly, flood elevation
data presented in the FIS should be utilized in conjunction with the FIRM for
purposes of construction and/or floodplain management.

Coastal Base Flood Elevation (BFEs) shown on this map apply only land-
ward of 0.0' National Geodetic Vertical Datum (NGVD). Users of this FIRM
should be aware that coastal flood elevations may also be provided in the
Summary of Stillwater Elevations table in the Flood Insurance Study report for
this community. Elevations shown in the Summary of Stillwater Elevations table
should be used for construction, and/or floodplain management purposes when
they are higher than the elevations shown on this FIRM.

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 National Flood Insurance Program. Floodway
widths and other pertinent floodway data are provided in the Flood Insurance
Study report for this jurisdiction.

Certain areas not in Special Flood Hazard Areas may be protected by flood
control structures. Refer to Section 2.4 "Flood Protection Measures" of
the Flood Insurance Study report for information on flood control structures
in this jurisdiction.

The projection used in the preparation of this map is Universal Tranverse
Mercator (UTM) Zone 13. The horizontal datum is NAD27, CLARKE1866
spheroid. Differences in datum, spheroid, projection or UTM zones used in
the production of FIRMs for adjacent jurisdictions may result in slight positional
differences in map features across jurisdiction boundaries. These differences
do not affect the accuracy of the FIRM.

Flood elevations on this map are referenced to the National Geodetic Vertical
Datum of 1929. These flood elevations must be compared to structure and
ground elevations referenced to the same vertical datum. For information
regarding conversion between the National Geodetic Vertical Datum of 1929
and the North American Vertical Datum of 1988, visit the National Geodetic
Survey website at www.ngs.noaa.gov or contact the National Geodetic Survey
at the following address:

Vertical Network Branch, N/CG13
National Geodetic Survey, NOAA
Silver Spring Metro Center 3
1315 East-West Highway
Silver Spring, Maryland 20910
[phone]

To obtain current elevation, description, and/or location information for bench marks
shown on this map, please contact the Information Services Branch of the
National Geodetic Survey at [phone], or visit their website at
www.ngs.noaa.gov.

Base map information shown on this FIRM was provided in digital format by
U.S. Bureau of Census TIGER files and have been geopositionally corrected.

Corporate limits shown on this map are based on the best data available
at the time of publication. Because changes due to annexations or de-annexations
may have occurred after this map was published, map users should contact
appropriate community officials to verify current corporate limit locations.

Please refer to the separately printed Map Index for an overview map of the
county showing the layout of map panels; community map repository addresses;
and a Listing of Communities table containing National Flood Insurance Program
dates for each community as well as a listing of the panels on which each
community is located.

An accompanying Flood Insurance Study report, Letters of Map Revision or
Letters of Map Amendment revising portions of this panel, and digital versions
of this PANEL may be available. Contact the FEMA Map Service Center at
the following phone numbers and Internet address for infomation on all related
products available from FEMA;

Phone: [phone]
FAX: [phone]
www.fema.gov/msc

If you have questions about this map or questions concerning the National
Flood Insurance Program in general, please call 1-877-FEMA-MAP (1-877-336-
2627) or visit the FEMA website at www.fema.gov.

This map reflects more detailed and up-to-date stream channel configurations
than those shown on the previous FIRM for this jurisdiction. The floodplains
and floodways that were transferred from the previous FIRM may have been
adjusted to conform to these new stream channel configurations. As a
result, the Flood Profiles and Floodway Data tables in the Flood Insurance
Study report may reflect stream channel distances that differ from what is
shown on this map.

JOINS PANEL 0439

LEGEND

SPECIAL FLOOD HAZARD AREAS SUBJECT TO INUNDATION
BY THE 1 % ANNUAL CHANCE FLOOD EVENT

1 05 003 '45 "
40000'00"

The 1 % annual chance flood (1 OO-year flood), also known as the base flood, is the flood
that has a 1 % chance of being equaled or exceeded in any given year. The Special
Flood Hazard Area is the area subject to flooding by the 1 % annual chance flood. Areas
of Special Flood Hazard include Zones A, AE, AH, AO, AR, A99, V, and VE. The Base
Flood Elevation is the water surface elevation of the 1 % annual chance flood.

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BOULDER COUNTY
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BOULDER COUNTY
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ZONE X

39058'07.5"
105005'37.5"

ZONE A

ZONE AE

ZONE AH

ZONE AO

ZONE AR

ZONE A99

ZONE V

ZONE VE

No base flood elevations determined.

Base flood elevations determined.

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

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

Area of special flood hazard formerly protected from the 1 % annual
chance flood event by a flood control system that was subsequently
decertified. Zone AR indicates that the former flood control system is
being restored to provide protection from the 1 % annual chance or
greater flood event.

Area to be protected from 1 % annual chance flood event by a Federal
flood protection system under construction; no base flood elevations
determined.

Coastal flood zone with velocity hazard (wave action); no base flood
elevations determined.

Coastal flood zone with velocity hazard (wave action); base flood elevations
determined.

FLOODWAY AREAS IN ZONE AE

The floodway is the channel of a stream plus any adjacent floodplain areas that must be
kept free of encroachment so that the 1 % annual chance flood can be carried without
substantial increases in flood heights.

ZONE X

ZONE X
ZONE D

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OTHER FLOOD AREAS

Areas of 0.2% annual chance flood; areas of 1 % annual chance flood
with average depths of less than 1 foot or with drainage areas less than
1 square mile; and areas protected by levees from 1 % annual chance
flood.

OTHER AREAS

Areas determined to be outside the 0.2% annual chance floodplain.
Areas in which flood hazards are undetermined, but possible.

COASTAL BARRIER RESOURCES SYSTEM (CBRS) AREAS

OTHERWISE PROTECTED AREAS (OPAs)

CBRS areas and OPAs are normally located within or adjacent to Special Flood Hazard Areas.

Floodplain Boundary
Floodway Boundary
Zone D Boundary
Coastal Barrier Boundary

................

Boundary dividing Special Flood Hazard Areas of different
Base Flood Elevations, flood depths or velocities.

(EL 987)

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Base Flood Elevation line and value; elevation in feet*

Base Flood Elevation value where uniform within zone;
elevation in feet*

* Referenced to the National Geodetic Vertical Datum of 1929

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Cross Section Line

9r07'30", 32022 '30"

Transect Line

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Geographic coordinates referenced to' the North American
Datum of 1927 (NAD 27)

4276000M

1 OOO-meter Universal Transverse Mercator grid values, zone 13

600000 FT

5000-foot grid ticks

Bench mark (see explanation in Notes to Users section of
this FIRM panel).

. M1.5

River Mile

MAP REPOSITORY
Refer to Repository Listing on Index Map

EFFECTIVE DATE OF COUNTYWIDE
FLOOD INSURANCE RATE MAP
JUNE 2, 1995

EFFECTIVE DA TE(S) OF REVISION(S) TO THIS PANEL

f----I f----I f----I

150 0

MAY 6, 1996
October 4, 2002: to change base flood
hazard areas, to change zone designations,
to reflect updated topographic information,
letters of map revision, and to change floodway.

elevations, to change special flood
to update roads and road names,
to incorporate previously issued

For community map revision history prior to countywide mapping, refer to the Community
Map History table located in the Flood Insurance Study report for this jurisdiction.

JOINS PANEL 0579

39058'07.5"
1 05 003 '45 "

To determine if flood insurance is available in this community, contact your insurance
agent or call the National Flood Insurance Program at [phone].

..

MAP SCALE 1" 500'

150

I METERS
300

PAN EL 0577 H

I

FIRM
FLOOD INSURANCE RATE MAP

BOULDER COUNTY,
COLORADO AND
INCORPORATED AREAS

PANEL 577 OF 595

(SEE MAP INDEX FOR FIRM PANEL LAYOUT)

CONTAINS:

COMMUNITY

NUMBER PANEL SUFFIX

BOULDER COUNTY,
UNINCORPORATED AREAS
LAFAYETTE, CITY OF

0577
0577

H
H

080023
080026

Notice to User: The Map Number shown below should be used
when placing map orders; the Community Number shown
above should be used on insurance applications for the subject
community,

MAP NUMBER
08013C0577 H

MAP REVISED:
OCTOBER 4, 2002

Federal Emergency Management Agency