18TH ST
Carrying 18TH ST over UP & TRRA RR
S 23 T 45 N R 7 E, St. Louis city, Missouri
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
18TH ST in St. Louis city, Missouri sits above 55% of rated Missouri bridges on inventory load rating (34 t), while its 1986 build year is earlier than 45% of St. Louis city's recorded-year cohort (240 bridges).
18TH ST in St. Louis city, Missouri is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1986, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 5. The lowest applicable rating sets the federal condition category, so this Fair result describes the weakest reported component rather than the structure as a whole. No NBI category is a closure decision or a live crossing-safety verdict.
NBI record plate
Structure MO:13134
LATE-CENTURY · STEEL · MULTI-SPAN · SUPER-LED · HEAVY-ADT · STANDARD-LOAD · CAT-FAIR
- LATE-CENTURY 1980–1999
- STEEL Steel
- MULTI-SPAN 3 spans
- SUPER-LED Superstructure-led
- HEAVY-ADT Heavy ADT
- STANDARD-LOAD Standard load
- CAT-FAIR Fair
Inspection-sheet codes from this record’s year, material family, spans, controlling component, ADT, inventory load, and NBI category, not a live closure verdict.
Bridge Snapshot: 18TH ST
The 18TH ST bridge in St. Louis city, Missouri carries 18TH ST over UP & TRRA RR. It was built in 1986, making it 40 years old today. The structure is built primarily of steel continuous and spans 3 sections, stretching 222.2 meters (729 feet) end to end. Daily traffic averages 14,500 vehicles, placing it in the heavily-trafficked tier of Missouri bridges. It is owned and maintained by City/Municipal Highway Agency.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 5/9, substructure at 6/9. The weakest component sits in fair condition. No reported major component scores in the Poor range under the current federal condition thresholds.
How 18TH ST compares
Age against the county: built in 1986, earlier than 107 of St. Louis city's 240 bridges with a recorded construction year (45%), against a county median build year of 1980. This is one of the newer structures in its county.
Live comparison across Missouri bridges with a recorded inventory load rating (24,616 of 24,618 rated).
18TH ST vs every rated Missouri bridge
Inventory load rating (metric tons), FHWA NBI, this state
34 Top 45% higher than 55% of 24,616 bridges
rated Missouri bridges, bucketed by value
Each bar is a band; taller bars hold more bridges. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source FHWA National Bridge Inventory · August 2026
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Reported 0–9 component ratings from the FHWA NBI. The highlighted component is the lowest reported input to this record’s current condition category; it is not a closure or live crossing-safety decision.
St. Louis city inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 240 bridges in this county. Orthogonal to this structure's component profile above: a county catalog share, not a live crossing-safety verdict.
Structural Details
- Year Built
- 1986
- Material
- Steel Continuous
- Number of Spans
- 3
- Structure Length
- 222.2 m (729 ft)
- Deck Width
- 17.9 m (59 ft)
- Owner
- City/Municipal Highway Agency
- Avg Daily Traffic
- 14,500 vehicles/day
- Structure Number
- 13134
Condition Analysis
- • At 6/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • At 5/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • At 6/9, the substructure (piers and abutments) shows fair condition, with minor wear flagged for upkeep.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
This page shows what the last federal inspection recorded, not whether 18TH ST is safe to cross today. Here is how to use it.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Learn how the 0–9 condition scale and Good/Fair/Poor categories are defined. How condition ratings work
- Compare 18TH ST against other structures in St. Louis city and across Missouri. Missouri bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for 18TH ST?
18TH ST in St. Louis city, Missouri has a deck rating of 6/9, superstructure rating of 5/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is 18TH ST inspected?
18TH ST's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 14,500 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 18TH ST is currently shown as Fair condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for 18TH ST?
18TH ST has an NBI inventory load rating of 34.2 metric tons.
Who is responsible for maintaining 18TH ST?
18TH ST is owned and maintained by City/Municipal Highway Agency.
How old is 18TH ST and does age affect safety?
18TH ST was built in 1986, making it 40 years old.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
Share this inspection record
Send this source-bounded record or download its data card. An NBI condition category is not a closure or live crossing-safety verdict.
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Component ratings, ADT, and condition category on this page are copied from the NBI record for this structure; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.