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Culvert & Drainage Structure Inspection
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Inspection of culvert barrels, end treatments, and hydraulic performance including scour, joint separation, and material-specific defects.
FHWA HIF-18-023 Culvert InspectionNBIS (culverts as bridges >20 ft)AASHTO Element 240-243
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Structure Identification
- Culvert asset ID / location *
- Culvert material (RCP / CMP / concrete box / plastic / masonry) *
- Span / diameter (ft)
- Does the culvert meet the 20 ft span threshold requiring NBIS bridge-level inspection?
Barrel Condition
- Is the barrel free of significant cracking, spalling, or exposed reinforcement (concrete)?
- Is the invert free of corrosion perforation or section loss (metal culverts)?
- Is the barrel free of deflection, shape distortion, or partial collapse? *
- Are joints free of separation, misalignment, or infiltration of backfill soil? *
- Overall culvert condition rating (0-9)
End Treatments
- Are headwalls, wingwalls, and aprons intact and stable? *
- Is there scour or undermining at the inlet or outlet? *
- Are end sections free of settlement or separation from the barrel?
Hydraulic Performance
- Is the barrel free of debris, sediment, or blockage restricting flow? *
- Percent of barrel cross-section obstructed by sediment/debris (%)
- Is there evidence of overtopping or roadway embankment erosion?
- Is the channel aligned and stable upstream and downstream?
Findings
- Is repair, lining, or replacement recommended? *
- Photograph inlet, outlet, and worst barrel defect
- Inspector signature *
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