Bridges — FHWA National Bridge Inventory: Condition, Posting & Clearance

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FHWA bridge inventory: 624,193 bridges, condition, posting, clearance. 8 tools, free, no key.

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find_low_clearance_bridges

Bridges in a state whose vertical clearance is at or below max_height_m. Default clearance is over the roadway on the bridge (NBI Item 10); set under=true for the clearance under the bridge (Item 54B), which is what matters for routes passing beneath. Sentinel 'no restriction' values are excluded.

statestring, required

US state postal code, e.g. 'IL'

max_height_mnumber, required

Clearance threshold in meters, e.g. 4.0

limitnumber

underboolean

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Tools (8)

find_low_clearance_bridges

Argument	Type	Description
limit	number
state*	string	US state postal code, e.g. 'IL'
under	boolean
max_height_m*	number	Clearance threshold in meters, e.g. 4.0

Input schema (JSON)

{
  "type": "object",
  "required": [
    "state",
    "max_height_m"
  ],
  "properties": {
    "limit": {
      "type": "number",
      "default": 100
    },
    "state": {
      "type": "string",
      "description": "US state postal code, e.g. 'IL'"
    },
    "under": {
      "type": "boolean",
      "default": false
    },
    "max_height_m": {
      "type": "number",
      "description": "Clearance threshold in meters, e.g. 4.0"
    }
  }
}

get_bridge

Get one bridge by its FHWA structure number (Item 8). Structure numbers are unique within a state; pass state to be exact. Returns the full decoded record.

Argument	Type	Description
id*	string	Structure number, e.g. '016-0032'
state	string	US state postal code, e.g. 'IL'

Input schema (JSON)

{
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "Structure number, e.g. '016-0032'"
    },
    "state": {
      "type": "string",
      "description": "US state postal code, e.g. 'IL'"
    }
  }
}

get_county_summaries

Per-county bridge counts for a state, with Poor-condition and posted/closed counts per county.

Argument	Type	Description
state*	string	US state postal code, e.g. 'IL'

Input schema (JSON)

{
  "type": "object",
  "required": [
    "state"
  ],
  "properties": {
    "state": {
      "type": "string",
      "description": "US state postal code, e.g. 'IL'"
    }
  }
}

get_state_summary

Bridge summary for one state: total bridges, counts by condition (Good/Fair/Poor), posted and closed counts, scour-critical count, average year built, total deck area. Without a state, returns per-state totals with condition counts for all states.

Argument	Type	Description
state	string	US state postal code, e.g. 'IL'

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "state": {
      "type": "string",
      "description": "US state postal code, e.g. 'IL'"
    }
  }
}

get_worst_bridges

The worst-rated bridges in a state (condition = Poor), ordered by lowest component rating then age. State is required. Use for 'worst bridges in X' questions.

Argument	Type	Description
limit	number
state	string	US state postal code, e.g. 'IL'

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "number",
      "default": 50
    },
    "state": {
      "type": "string",
      "description": "US state postal code, e.g. 'IL'"
    }
  }
}

list_bridges_in_county

List bridges in one county (state + 3-digit FIPS county code), paged.

Argument	Type	Description
limit	number
state*	string	US state postal code, e.g. 'IL'
county*	string	3-digit FIPS county code
offset	number

Input schema (JSON)

{
  "type": "object",
  "required": [
    "state",
    "county"
  ],
  "properties": {
    "limit": {
      "type": "number",
      "default": 100
    },
    "state": {
      "type": "string",
      "description": "US state postal code, e.g. 'IL'"
    },
    "county": {
      "type": "string",
      "description": "3-digit FIPS county code"
    },
    "offset": {
      "type": "number",
      "default": 0
    }
  }
}

list_posted_or_closed_bridges

Bridges in a state that are load-posted or closed to traffic (NBI Item 41 status P/R/K), worst condition first. Relevant for routing and heavy-haul feasibility — but per FHWA, NBI data must not be used as the sole source for route clearance; inspections can be up to ~24 months old.

Argument	Type	Description
limit	number
state*	string	US state postal code, e.g. 'IL'
offset	number

Input schema (JSON)

{
  "type": "object",
  "required": [
    "state"
  ],
  "properties": {
    "limit": {
      "type": "number",
      "default": 100
    },
    "state": {
      "type": "string",
      "description": "US state postal code, e.g. 'IL'"
    },
    "offset": {
      "type": "number",
      "default": 0
    }
  }
}

search_bridges

Search US bridges in the FHWA National Bridge Inventory. Scope with state, county (3-digit FIPS code), and/or condition (Good/Fair/Poor); optional filters: posting_status (open/posted/closed/not_yet_open), owner_code, scour_critical, year_min/year_max, min_adt, route, and q (text match on facility carried, feature crossed, location). Returns decoded records with condition rollup, posting status, clearances, and labels.

Argument	Type	Description
q	string	Text match: facility carried / feature crossed / location
limit	number
route	string	Route number carried, e.g. '90'
state	string	US state postal code, e.g. 'IL'
county	string	3-digit FIPS county code within the state
offset	number
min_adt	number	Minimum average daily traffic
year_max	number
year_min	number
condition	string