Bridge inspectors check concrete for cracking, scaling, spalling, delamination, exposed reinforcement and other signs of deterioration, then document where defects occur and how extensive they are. What a defect means depends on its location, dimensions, condition and context—not simply on whether it is visible. In the United States, the National Bridge Inspection Standards (NBIS) apply to highway bridges on public roads; requirements elsewhere may differ. FHWA’s bridge inspection resources provide the federal context.
What concrete deck inspectors look for
The deck is the concrete surface that carries traffic. FHWA’s Recording and Coding Guide identifies several conditions inspectors may record, including:
- Cracking, with its pattern and location considered in context.
- Scaling, leaching and chloride contamination.
- Spalling and delamination.
- Potholes and partial- or full-depth failures.
These conditions can have different causes and implications. A visible surface defect does not, by itself, establish how deep deterioration extends or whether the deck’s capacity has changed. See the FHWA Recording and Coding Guide and NBIS material.
What inspectors check on concrete members and reinforcement
On concrete beams, columns, piers and other members, inspectors look for cracks, deterioration, spalls, delaminations and exposed reinforcing bars. They also assess whether exposed reinforcement has measurable section loss. FHWA’s SNBI defect guidance distinguishes between conditions that may look similar but differ in severity: a small, sound spall is not equivalent to a large, unsound one, and exposed rebar without measurable loss is distinct from exposed rebar with measurable loss.
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Cracks also need description, not just a checkbox. Inspectors consider width, spacing, location, orientation and whether the pattern appears structural or non-structural. The presence of a crack alone does not determine its severity. FHWA’s SNBI guidance and Long-Term Bridge Performance (LTBP) concrete assessment protocols provide inspection context.
How inspectors document and classify defects
Inspection records identify the affected component and the defect’s location and extent. For spalling, FHWA’s LTBP protocol calls for recording the relevant element and area. Useful observations include dimensions, the condition of the surrounding concrete and whether reinforcement is exposed. In available records, inspectors may also compare the finding with earlier observations to assess whether it appears stable or has changed.
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FHWA’s SNBI guidance gives examples of defect severity, not a stand-alone verdict on a bridge’s safety:
| Observed condition | SNBI example category |
|---|---|
| Small, sound spall or patched area | Minor |
| Large, unsound spall or distressed patch | Moderate |
| Exposed reinforcement without measurable section loss | Minor |
| Exposed reinforcement with measurable section loss | Moderate |
These examples are from FHWA’s SNBI defect guidance. A defect category does not predict failure or replace an engineering assessment.
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FHWA’s National Bridge Inventory condition-rating overview describes a scale from 9 (excellent) through lower ratings associated with progressively more serious deterioration. On that scale, 5 is fair: primary elements are sound but may show minor section loss, cracking, spalling or scour. A rating of 4 is poor, indicating advanced section loss, deterioration, spalling or scour. These are component-condition classifications, not direct public-safety conclusions. See FHWA’s condition-rating overview.
When close-up access or additional testing is needed
A routine visual inspection may not reveal the extent of a suspected defect. FHWA describes an in-depth inspection as a close-up, hands-on examination of one or more members to find deficiencies that routine procedures may not readily show. Depending on the bridge and assignment, access can involve under-bridge inspection equipment, staging, workboats, divers or riggers. FHWA’s inspection resources explain these approaches.
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FHWA’s 2022 NBIS Questions and Answers, answer A313-6, says special equipment is necessary when it provides the only practical means of access needed to identify defect extent and severity. Depending on what must be established, inspectors may also use nondestructive, physical or chemical tests. The appropriate method depends on the inspection question and access conditions; a test is not a substitute for documenting what was observed. See the FHWA NBIS Questions and Answers.
Sounding suspected spalls and delaminations
For a suspected delamination or spall, FHWA’s 2016 LTBP protocol describes striking the concrete surface with a sounding hammer and listening for hollow-sounding areas. A hollow response can help identify areas for closer assessment; it does not alone establish the full depth, cause or structural significance of a defect. This protocol is intended for trained inspection practice, not as a public self-inspection method. See FHWA’s Concrete Superstructure and Substructure—Spalls and Delaminations protocol.
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Why a concrete checklist is not a full bridge inspection
Inspectors assess the bridge as a system, within the scope of the inspection. In addition to concrete, relevant checks may include bearing condition and alignment, settlement, scour and collision damage. Which components and conditions are examined depends on the bridge and the inspection assignment. FHWA’s bridge inspection and condition-rating material describes this broader context.
How inspection findings relate to load ratings
Inspection and load rating are related but separate activities. A load rating evaluates a bridge’s capacity under specified assumptions; inspection findings provide evidence about its present condition. FHWA’s synthesis report explains that cracking or spalling may affect load-rating calculations if deterioration reduces the concrete section, and field observations can corroborate a rating below design loads. That does not mean every crack requires a rating change, or that visual inspection alone establishes safe capacity. A change in a structural element’s condition is one possible reason for re-rating under FHWA’s NBIS guidance. See the FHWA load-rating synthesis and NBIS Questions and Answers.
What readers should take from an inspection report
When reviewing findings, look for the component and precise location, defect type and dimensions, severity, reinforcement exposure or section loss, and comparison with prior records where available. The report should also make clear whether ordinary visual access was enough or whether close-up access or supplementary testing was used. These details help explain what was observed; questions about a particular bridge should be directed to its owner or a qualified bridge engineer using the current inspection record and applicable procedures.
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