Legend
Effective FIRM (Digital)
The Limit of Study line is used to indicate the terminus of a 1- percent-annual-chance floodplain of a stream or backwater area that has not been independently studied by detailed analyses, or of a stream that has been studied by detailed methods.
Base Flood Elevation Line; Elevation in Feet*
Cross-Sections; Elevation in Feet*
Levee, Dyke or Floodwall
1-percent-annual-chance Flood Hazard Area (Zones A, AE, AO, AH, AR, A99, V, and VE)
Floodway Area
Flood Zone X- 0.2-percent-annual-chance Flood Hazard Area (shaded Zone X)
- Flood Zone X: Area with Reduced Flood Risk due to Levee
Zone D Area Not Included- *Referenced to the North American Vertical Datum of 1988.
Proposed FIRM (Digital)
Used for Preliminary FIRM and Future FIRM
The Limit of Study line is used to indicate the terminus of a 1- percent-annual-chance floodplain of a stream or backwater area that has not been independently studied by detailed analyses, or of a stream that has been studied by detailed methods.- Base Flood Elevation Line; Elevation in Feet*
- Cross-Sections; Elevation in Feet*
- Levee, Dyke or Floodwall
1-percent-annual-chance Flood Hazard Area (Zones A, AE, AO, AH, AR, A99, V, and VE)
Floodway Area- Flood Zone X
- 0.2-percent-annual-chance Flood Hazard Area (shaded Zone X)
- Flood Zone X: Area with Reduced Flood Risk due to Levee
Zone D Area Not Included- *Referenced to the North American Vertical Datum of 1988.
FIRM (Paper, Scanned Grayscale)
May be an Effective FIRM or Historical FIRM
SPECIAL FLOOD HAZARD AREAS INUNDATED BY 100-YEAR FLOOD:
- ZONE A - No base flood elevations determined.
- ZONE AE - Base flood elevation 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 flooding; velocities also determined.
- ZONE A99 - To be protected from 100-year flood by federal flood protection system under construction; no base flood elevations determined.
- ZONE V - Coastal flood with velocity hazard (wave action); no base flood elevations determined.
- ZONE VE - Coastal flood with velocity hazard (wave action); base flood elevations determined.
FLOODWAY AREAS IN ZONE AE
OTHER FLOOD AREAS:
- ZONE X - Areas of 500-year flood; or 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.
- ZONE B - Areas of 500-year flood as listed on older maps.
OTHER AREAS:
- ZONE X - Areas determined to be outside 500-year floodplain.
- ZONE C - Areas determined to be outside 500-year floodplain as listed on older maps.
- ZONE D - Areas in whichflood hazards are undetermined.
Floodplain Boundary
Floodway Boundary
Zone D Boundary
Boundary Dividing Special Flood Hazard Zones.Base Flood Elevation Line; Elevation in Feet**
Cross Section Line
Base Flood Elevation in Feet Where Uniform Within Zone*
Elevation Reference Mark
Stream Distance Marker (shown at approximate 5000 foot intervals)