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FLOOD HAZARD INFORMATIONIS NOT SHOWN ON THIS MAPIN AREAS OUTSIDE OFST. CLAIR COUNTY
FLOOD HAZARD INFORMATIONIS NOT SHOWN ON THIS MAPIN AREAS OUTSIDE OFST. CLAIR COUNTY
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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
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FLOOD INSURANCE RATE MAP
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PRELIM
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PANEL 95 OF 555
MAP NUMBER
17163C0095E
PANEL 0095E
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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