sweetapricity/bridgedeck-nbi

Bridgedeck — National Bridge Inventory (2000–2023)

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

Overview

Cleaned and parsed National Bridge Inventory (NBI) records for all US states, 2000–2023. One row per bridge per inspection year. Covers structural properties, geometry, materials, traffic, condition ratings, and a derived 5-year deck deterioration target.

The NBI is the backbone of the bridgedeck dataset — all other datasets (PRISM, NOAA, NSHM, NFHL, Salt) are joined to it via bridge_id or county_fips.

Source

Source: FHWA National Bridge Inventory

Coverage: All 50 states + DC + PR, 2000–2023 (1,248 raw .txt files)

Reference: NBI Recording and Coding Guide (FHWA)

Schema

One row per (bridge_id, year). Primary key: (bridge_id, year).

Identifiers & Location

Column	Type	Description
bridge_id	str	{state_fips}_{county_fips}_{structure_number} — primary key
year	int	Inspection year (2000–2023)
state_code	str	2-digit FIPS state code (e.g. "48" = TX)
county_code	str	3-digit FIPS county code
county_fips	str	state_code + county_code — used to join NOAA storm data
structure_number	str	FHWA structure number (whitespace-stripped)
latitude	float	Decimal degrees WGS-84 North
longitude	float	Decimal degrees WGS-84 West (negative)

Design & Material

Column	NBI Item	Description
year_built	027	Year of original construction
year_reconstructed	106	Year of major reconstruction; 0 = never reconstructed
main_span_material	043A	Main span material (1=Concrete, 3=Steel, 5=PSC, 7=Wood)
main_span_design	043B	Main span design type (01=Slab, 02=Stringer, 05=Box Beam)
deck_structure_type	107	Deck type (1=CIP Concrete, 2=Precast, 3=Open Grating)
wearing_surface_type	108A	Wearing surface (0=Monolithic, 1=Bituminous, 4=Epoxy)
membrane_type	108B	Waterproofing membrane (0=None, 1=Built-up, 3=Epoxy)
deck_protection	108C	Rebar protection (0=None, 1=Epoxy, 2=Galvanized, 4=Cathodic)
design_load	031	Design load standard (5=MS18+, A=HL-93)
num_spans_main	045	Number of spans in main unit
max_span_length	048	Maximum span length (metres)
structure_length	049	Total structure length (metres)
deck_width	052	Out-to-out deck width (metres)
scour_critical	113	Scour criticality (3=Critical, 8=Not critical, N=Not over water)

Operational

Column	NBI Item	Description
adt	029	Average Daily Traffic (vehicles/day)
adtt_pct	109	Truck percentage of ADT (%)
operating_rating	064	Operating load rating (metric tons)
functional_class	026	Route classification (01=Rural Interstate, 09=Rural Local)

Condition Ratings (0–9 scale: 9=Excellent, 0=Failed)

Column	NBI Item	Description
deck_cond	058	Deck condition rating — primary ML target source
superstructure_cond	059	Superstructure condition rating
substructure_cond	060	Substructure condition rating
culvert_cond	062	Culvert condition rating (N for non-culverts)

Derived Features & Target

Column	Description
bridge_id	Synthetic primary key: {state_code}_{county_code}_{structure_number}
age	year − year_built; negative values set to NaN
deck_area	deck_width × structure_length (m²)
deck_cond_num	deck_cond cast to integer; culverts (N) filtered out
future_deck_cond_5yr	Deck rating at year + 5; NaN if no future inspection
deck_drop_5yr	ML target: 1 if deck dropped ≥1 point in 5yr, 0 if stable, NaN if censored/repaired

ML Target (deck_drop_5yr)

Binary classification: did this bridge's deck condition rating drop by ≥ 1 point within the next 5 years?

Value	Meaning
1	Deck rating at t+5 is at least 1 point lower → deteriorated
0	Deck rating at t+5 is the same → stable
NaN	Censored (no future inspection) or repaired (rating went up)

Positive rate: ~25% (5-year horizon). Rows from 2019–2023 are censored (no future data).

Data Quality Notes

• Zero-encoded coordinates (LAT=00000000) are dropped.
• Longitude values outside [-180, 0] are dropped.
• Only NBI record type 1 (main records) is kept; continuation records are excluded.
• Culverts (deck_cond = 'N') are excluded from the ML panel.
• Duplicate bridge records (same bridge_id + year) are deduplicated by keeping the first.

Join Key

Join other bridgedeck datasets to NBI on:

• (bridge_id, year) for time-varying datasets (PRISM, NOAA)
• bridge_id for static datasets (NSHM, NFHL)
• state_code for state-level datasets (Salt)

Related Datasets

Repo	Description
sweetapricity/bridgedeck-nbi	This dataset — National Bridge Inventory, 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	FEMA flood zone classification 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.