Bridge Inspection Automation
Bridge inspectors were spending as much time at their desks as they were on the bridge. Complex deterioration formulas and a 116-field federal submission process consumed days of post-field work per inspection. The calculations were automated — not the inspection.
6h
hours saved per bridge
94%
NBI error reduction
30m
min. review per submission
The inspection was finished. The work had just begun.
The inspectors on this team were highly trained structural engineers. Their value was in what they noticed on the bridge — hairline cracks, section loss, bearing movement. But after every field visit, they came back to an office workflow that demanded just as much of their time and none of their expertise.
Transcribe Field Notes
Inspectors returned from the bridge and manually typed up hand-written field observations into a separate office system — a step that added hours and introduced transcription errors.
Calculate Deterioration Rates
Using current and historical condition ratings, inspectors manually applied deterioration curve formulas to estimate remaining service life for each structural element.
Map Observations to NBI Codes
Field observations had to be translated into standardized NBI condition codes (0–9 scale) for deck, superstructure, substructure, and culvert elements — each with its own rating criteria.
Calculate Sufficiency Rating
The federal Sufficiency Rating formula — a weighted composite of structural adequacy, serviceability, and essentiality factors — was calculated by hand and verified for each bridge.
Populate NBI Forms
The 116-field NBI submission form was filled out manually, cross-referencing calculated ratings, prior submissions, and bridge inventory records to avoid rejections.
Submit & Resolve Rejections
Submissions with inconsistent data were rejected by the federal system. Inspectors tracked down the source of each error and resubmitted — sometimes through multiple cycles.
6–8 hours of desk work for every bridge inspection
None of those hours required a structural engineer. The NBI codes follow documented rules. The sufficiency rating formula is published. The forms have fixed fields. Every one of those steps was calculable — it just hadn't been automated yet.
WHAT IS NBI?
The federal report every bridge in America requires
The National Bridge Inventory is a federal database maintained by the FHWA. Every publicly accessible bridge must be inspected at least every 24 months and the results submitted as a standardized record — 116 data fields covering structural condition, geometry, traffic load, and inspection metadata.
Condition ratings use a 0–9 scale defined in the FHWA Recording and Coding Guide. The overall Sufficiency Rating — a 0–100 composite — determines federal funding eligibility for repair or replacement. Errors or inconsistencies trigger rejections that can delay funding cycles by months.
The calculations that used to take a day, done before the inspector leaves the field
Nothing changed about what inspectors observe or how they report it. What changed was everything that happens the moment field data is submitted — every formula runs automatically, every form field pre-fills, every conflict surfaces before it becomes a federal rejection.
Deterioration Rate Engine
Pulls historical condition ratings for each structural element and applies standard deterioration curve models automatically. Inspectors see projected condition timelines and remaining service life estimates the moment field data is entered.
NBI Condition Code Calculator
Maps field observations — crack widths, section loss percentages, delamination area — to the correct NBI 0–9 ratings using the FHWA coding guide logic. Draft ratings are generated instantly, flagged where field data is ambiguous.
Sufficiency Rating Automation
The federal Sufficiency Rating formula (SD + FO + UD − Deficiency deductions) runs automatically from the computed NBI codes, with each factor broken out so inspectors can verify the inputs before approving the result.
NBI Package Pre-Population
All 116 NBI fields are pre-filled from calculated ratings, bridge inventory records, and prior submissions. Inspectors open a pre-completed form and review — not a blank one they have to build.
Pre-Submission Validation
Cross-field consistency rules are run before the package ever leaves the office. Conflicts that would trigger federal rejections are surfaced immediately with the specific fields and the correction needed.
Inspector approval required at every step
No calculation is submitted without inspector sign-off. The system generates, the inspector verifies. When a calculated rating differs from the inspector's field judgment, the inspector's value wins — and the system learns from the override for future inspections on that structure.
Inspectors back on bridges, not stuck at desks
BEFORE
- Inspectors manually transcribed field notes into office systems
- Deterioration curves calculated by hand from historical tables
- NBI condition codes looked up and assigned one element at a time
- Sufficiency Rating calculated manually with a multi-factor formula
- Forms filled from scratch for each of 116 submission fields
- Federal rejections chased down and resubmitted, sometimes in multiple cycles
AFTER
- Field data submitted once; calculations run automatically on entry
- Deterioration timelines and remaining service life appear instantly
- NBI condition codes generated from field observations with confidence flags
- Sufficiency Rating computed and factor breakdown displayed for review
- NBI package pre-filled; inspector opens a form to approve, not build
- Consistency validation runs pre-submission — rejections effectively eliminated
6h
Saved per bridge
Post-field office time cut per inspection — returned directly to field capacity and report quality.
94%
NBI error reduction
Cross-field validation catches inconsistencies before submission, nearly eliminating federal rejections.
30m
To review a full NBI package
Down from a full day. Inspectors verify auto-generated ratings rather than computing them from scratch.
2×
Inspection capacity
Same team, same budget. With desk time halved, the team covers twice as many structures per inspection cycle.
Compliance work slowing your team down?
If your team has domain experts spending hours on calculation and form work, there's a fit here. We start by understanding the exact rules that govern the process — then we automate the application of those rules so your people can focus on the judgment calls only they can make.