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sweetapricity/bridgedeck-nfhl

Bridgedeck — FEMA National Flood Hazard Layer at Bridge Locations (NFHL) Part of the bridgedeck dataset collection for US bridge deck deterioration research. Overview FEMA flood zone designation queried at each unique US bridge location from the National Flood Hazard Layer (NFHL) via the FEMA ArcGIS REST API. Flood zone exposure is a key force-majeure deterioration factor — bridges in floodplains experience more frequent inundation, scour, debris impact, and… See the full description on the dataset page: https://huggingface.co/datasets/sweetapricity/bridgedeck-nfhl.

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Dataset Card

Bridgedeck — FEMA National Flood Hazard Layer at Bridge Locations (NFHL)

Part of the bridgedeck dataset collection for US bridge deck deterioration research.

Overview

FEMA flood zone designation queried at each unique US bridge location from the National Flood Hazard Layer (NFHL) via the FEMA ArcGIS REST API. Flood zone exposure is a key force-majeure deterioration factor — bridges in floodplains experience more frequent inundation, scour, debris impact, and moisture exposure.

Source

Source: FEMA National Flood Hazard Layer API: FEMA ArcGIS REST API — queried per bridge lat/lon (~906k calls, resumable) Coverage: CONUS, static (updated periodically as new flood studies are completed)

File	Description
`nfhl_bridge_zones.csv`	Raw flood zone query results for each bridge location

Schema

Column	Type	Description
`bridge_id`	str	`{state_fips}_{county_fips}_{structure_number}` — joins to NBI
`fld_zone`	str	Raw FEMA flood zone code (AE, X, VE, etc.)
`sfha_tf`	str	FEMA SFHA flag: `T`=in Special Flood Hazard Area, `F`=not

Features Derived

After running make etl-nfhl, the following features are added to the panel:

Feature	Description
`fld_zone`	Raw FEMA flood zone code (AE, X, VE, etc.)
`in_sfha`	Boolean: bridge in Special Flood Hazard Area (100-year floodplain)
`in_100yr`	Boolean: bridge in 100-year floodplain (derived from zone code)
`in_500yr`	Boolean: bridge in Zone X (500-year floodplain, moderate hazard)

Flood Zone Classification

Zone	Description	`in_sfha`	`in_100yr`	`in_500yr`
AE, A, A1-A30	100-year floodplain, base flood elevation determined	✓	✓	—
VE, V, V1-V30	Coastal high-hazard area (wave action)	✓	✓	—
AO, AH	Shallow flooding	✓	✓	—
X (shaded)	500-year floodplain (moderate hazard)	—	—	✓
X (unshaded)	Minimal flood hazard	—	—	—
D	Undetermined flood hazard	—	—	—

Related Datasets

Repo	Description
`sweetapricity/bridgedeck-nbi`	National Bridge Inventory — structural features, 2000–2023
`sweetapricity/bridgedeck-prism`	PRISM climate features at bridge locations, 2000–2023
`sweetapricity/bridgedeck-noaa`	NOAA storm event counts by county, 2000–2023
`sweetapricity/bridgedeck-nshm`	USGS seismic hazard at bridge locations (static)
`sweetapricity/bridgedeck-nfhl`	This dataset — FEMA flood zone at bridge locations (static)
`sweetapricity/bridgedeck-salt`	USGS road salt tiers by state (static)

Paper

Ibrahim, A., Abdelkhalek, S., Zayed, T., Qureshi, A. H., & Mohammed Abdelkader, E. (2024). A comprehensive review of the key deterioration factors of concrete bridge decks. Buildings, 14(11), 3425.