Author : Navya Rao

4 minutes

August 19, 2025

NBIS 23 Metrics: What FHWA Expects from Every Bridge Program

From inspection frequencies to reporting timelines, these 23 core metrics define whether your bridge inspection program is truly in compliance with the National Bridge Inspection Standards (NBIS).

These aren’t just checkboxes; they’re federally mandated requirements that shape the integrity and credibility of your entire bridge program.

1. The 23 NBIS Metrics - At a Glance

FHWA evaluates compliance using 23 specific metrics. They span everything from personnel qualifications to data reporting, and they are typically grouped into four key areas:

Group 1: Program & Personnel (Metrics 1–5)

These five metrics ensure your bridge program has the right structure and the right people.

  • Metric 1 – Program Organization
  • Metric 2 – Qualifications of Program Manager
  • Metric 3 – Qualifications of Team Leaders
  • Metric 4 – Qualifications of Load Rating Engineer
  • Metric 5 – Qualifications of Underwater Bridge Inspection Diver

Group 2: Inspection Frequencies (Metrics 6–11)

These metrics govern how often different types of inspections must occur — based on bridge risk levels and types.

  • Metric 6 – Routine Inspection: Lower Risk
  • Metric 7 – Routine Inspection: Higher Risk
  • Metric 8 – Underwater Inspection: Lower Risk
  • Metric 9 – Underwater Inspection: Higher Risk
  • Metric 10 – Fracture Critical Inspection
  • Metric 11 – Frequency Criteria Guidelines

Group 3: Inspection Procedures (Metrics 12–21)

This is the most detailed group, covering how inspections are conducted and documented.

  • Metric 12 – Inspection Quality
  • Metric 13 – Load Rating
  • Metric 14 – Load Posting or Restrictions
  • Metric 15 – Bridge File Requirements
  • Metric 16 – Fracture Critical Members
  • Metric 17 – Underwater Evaluation Standards
  • Metric 18 – Scour Assessment
  • Metric 19 – Complex Bridge Inspection
  • Metric 20 – QA/QC Program
  • Metric 21 – Critical Findings Protocols

Group 4: Data & Reporting (Metrics 22–23)

These final two metrics define how data must be maintained and reported to ensure system-wide trust and readiness.

  • Metric 22 – Preparation and Recordkeeping
  • Metric 23 – Timely Updates to the National Bridge Inventory (NBI)

2. Why These Metrics Matter

The NBIS 23 Metrics form the foundation for national consistency. They ensure that:

  • Bridge conditions are routinely and reliably assessed
  • Inspection programs are professionally staffed and documented
  • Safety-related findings are acted upon promptly
  • States maintain a defensible, traceable record of program performance

Ultimately, these metrics help safeguard infrastructure, reduce risk, and build public trust.

3. What FHWA Looks for During Reviews

Annual Compliance Reviews

Each year, FHWA Division Offices evaluate whether your program is meeting these expectations.

What to Expect:

  • Schedule: Annual or rotational, depending on your state
  • Approach: Random sampling across bridge types and inspection categories
  • Focus: Documentation, team qualifications, QA/QC processes, and field practices

4. What Compliance Actually Means

Your program’s status is categorized into four compliance levels:

Staying Ready

To remain audit-ready:

  • Keep all documentation and training records updated
  • Perform internal QA/QC checks
  • Regularly review bridge files and inspection procedures
  • Be proactive about aligning with the NBIS metrics year-round

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