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Page 1: Unincorporated Areas - Illinois Floodmaps · dd d d d d d d d d d d d d 7 7 7... 7 7.... ÑÑ Ñ ÑÑ Ñ ÑÑ Ñ ÑÑÑÑ ÑÑ ÑÑÑÑ ÑÑ ÑÑÑÑ ÑÑ ÑÑÑÑ ÑÑ ˘ ˇ ˆˇ

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St. Clair County

Unincorporated Areas

170616

St. Clair County

Unincorporated Areas

170616

St. Clair County

Unincorporated Areas

170616

St. Clair County

Unincorporated Areas

170616

St. Clair County

Unincorporated Areas

170616

St. Clair County

Unincorporated Areas

170616

City of O’Fallon

170633

City of O’Fallon

170633

City of O’Fallon

170633

City of O’Fallon

170633

Village of Shiloh

171043

Village of Shiloh

171043

City of O’Fallon

170633

City of O’Fallon

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Floodway boundary

Zone D boundary

0.2% annual chance floodplain boundary

1% annual chance floodplain boundary

*Referenced to the North American Vertical Datum of 1988

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LEGEND

SPECIAL FLOOD HAZARD AREAS (SFHAs) SUBJECT TOINUNDATION BY THE 1% ANNUAL CHANCE FLOOD

The 1% annual chance flood (100-year flood), also known as the base flood, is the flood that hasa 1% chance of being equaled or exceeded in any given year. The Special Flood Hazard Area isthe area subject to flooding by the 1% annual chance flood. Areas of Special Flood Hazardinclude 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.

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 Elevationsdetermined.

ZONE AO 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.

ZONE AR Special Flood Hazard Areas formerly protected from the 1% annual chanceflood by a flood control system that was subsequently decertified. ZoneAR indicates that the former flood control system is being restored to provide

protection from the 1% annual chance or greater flood.

ZONE A99 Area to be protected from 1% annual chance flood by a Federal floodprotection system under construction; no Base Flood Elevations determined.

ZONE V Coastal flood zone with velocity hazard (wave action); no Base Flood Elevationsdetermined.

ZONE VE Coastal flood zone with velocity hazard (wave action); Base Flood Elevationsdetermined.

FLOODWAY AREAS IN ZONE AE

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

flood heights.

OTHER FLOOD AREAS

ZONE X Areas of 0.2% annual chance flood; areas of 1% annual chance flood withaverage 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

ZONE X Areas determined to be outside the 0.2% annual chance floodplain.

ZONE D 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.

CBRS and OPA boundary

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

Base Flood Elevation line and value; elevation in feet*513

)��"#�* Base Flood Elevation value where uniform within zone; elevation infeet*

Cross section line

Transect line

$�+�� ���#�,��"�+�� ��� �Geographic coordinates referenced to the North American Datum of1983 (NAD 83) Western Hemisphere

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%-���� Bench mark (see explanation in Notes to Users section of this FIRMpanel)

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FLOOD INSURANCE RATE MAP

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PRELIM

INARY

PANEL 210 OF 555

MAP NUMBER

17163C0210E

PANEL 0210E

MAP REVISED

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ST. CLAIR COUNTY,

ILLINOIS

AND INCORPORATED AREAS

MAP SCALE 1" = 1000’MAP SCALE 1" = 1000’

FEET500 0 20001000

METERS300 3000 600

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