Gallatin County, Illinois Flood Risk Score
Gallatin County, Illinois has a 3.7 / 10 flood risk score from PerilScore v4 data.
Computed from decades of public weather data using physics-based probability modeling.
- Risk Score (0-10)
- 3.7
- Historical Events
- No data
- Avg Return Period
- No data
- Data Confidence
- 20%
in the record
years between events
Gallatin County, Illinois has a 3.7 / 10 flood risk score, which falls in the very high band and is in the 96th percentile among scored local areas in this model. The score was snapshotted on 2026-06-17 with 20% model confidence.
What drives this score here?
FEMA NFHL zone is the largest V4 contributor from registered local hazard drivers. For this location, the score card also highlights these model signals:
- FEMA score: 8.0
- Riverine: 4.3
- Pluvial: 0.6
- Coastal: 0
The strongest component metrics in the snapshot are:
- Fema NFHL Zone: model component 0.160. The raw value is 8.00.
- Riverine Flood Risk: model component 0.077. The raw value is 4.29.
- 24 Hour Atlas 14 Rainfall: model component 0.060. The raw value is 7.0 in.
For flood exposure, the useful signals are FEMA zone score, riverine risk, rainfall-driven pluvial risk, coastal risk, compound interaction, and flood history. This snapshot shows riverine at 4.3, pluvial at 0.6, and coastal at 0.
How to read the location signal
This page uses the representative local model area around the county or parish centroid for Gallatin County, Illinois. That local model area is roughly 5 square kilometers, so the score is a practical place-level signal for browsing and comparison. The building-level view comes from entering a street address.
The confidence level is limited, so the score is best read as an early signal before checking the address-level result.
The source record for this page is: PerilScore local flood local model feature table with NFHL, Atlas 14, event, and compound drivers
Why building details matter
A street-address score can account for the unique characteristics of a specific building, including age, construction type, roof shape and condition, occupancy, elevation, defensible space, drainage, terrain, and nearby exposure. Those details can change resilience or susceptibility around the same location-level score.
Use this county page as the broadest browse layer before drilling into city and ZIP pages. Since the percentile is elevated, it is worth comparing nearby pages before relying on the area score alone.
Use the PerilScore app to enter a street address and see the full property-specific score.
The local score is the starting point
A specific building can perform differently from the surrounding area. The PerilScore street-address check adds building age, construction type, roof details, occupancy, elevation, defensible space, drainage, terrain, and nearby exposure to the flood layer shown here.
PerilScoreMore flood scores nearby
About this flood score
What does the flood score mean for Gallatin County, Illinois?
Why can nearby buildings have different flood risk?
How do I get the building-specific score?
Want the full picture for a specific property?
The scores on this site show the representative flood layer for a local area. Enter a street address to add building age, construction type, roof details, occupancy, surroundings, and property-level context.