TR 37A
Carrying TR 37A over ROCK SPRINGS BRANCH
.5 M EAST CH 61, St. Clair, Illinois
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
TR 37A in St. Clair, Illinois sits above 24% of rated Illinois bridges on inventory load rating (32 t), while its 1989 build year is earlier than 33% of St. Clair's recorded-year cohort (486 bridges).
TR 37A in St. Clair, Illinois is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 1989, it carries 1 rated component on the inspecting agency's 0-9 scale, and its weakest reported component scores 7. The lowest applicable rating sets the federal condition category, so this Good 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 IL:082308000000000
LATE-CENTURY · CONCRETE · MULTI-SPAN · CULVERT-LED · LOCAL-ADT · STANDARD-LOAD · CAT-GOOD
- LATE-CENTURY 1980–1999
- CONCRETE Concrete
- MULTI-SPAN 3 spans
- CULVERT-LED Culvert-led
- LOCAL-ADT Local ADT
- STANDARD-LOAD Standard load
- CAT-GOOD Good
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: TR 37A
The TR 37A bridge in St. Clair, Illinois carries TR 37A over ROCK SPRINGS BRANCH. It was built in 1989, making it 37 years old today. The structure is built primarily of concrete and spans 3 sections, stretching 13.1 meters (43 feet) end to end. Daily traffic averages 575 vehicles, placing it in the lower-traffic tier of Illinois bridges. It is owned and maintained by Town/Township Highway Agency.
The latest FHWA inspection records show culvert at 7/9. The weakest component sits in good condition. No reported major component scores in the Poor range under the current federal condition thresholds.
How TR 37A compares
Age against the county: built in 1989, earlier than 160 of St. Clair's 486 bridges with a recorded construction year (33%), against a county median build year of 1979. This is one of the newer structures in its county.
Live comparison across Illinois bridges with a recorded inventory load rating (26,904 of 26,928 rated).
TR 37A vs every rated Illinois bridge
Inventory load rating (metric tons), FHWA NBI, this state
32 Top 76% higher than 24% of 26,904 bridges
rated Illinois 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.
St. Clair inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 486 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
- 1989
- Material
- Concrete
- Number of Spans
- 3
- Structure Length
- 13.1 m (43 ft)
- Deck Width
- 8.5 m (28 ft)
- Owner
- Town/Township Highway Agency
- Avg Daily Traffic
- 575 vehicles/day
- Structure Number
- 082308000000000
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 TR 37A 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 TR 37A against other structures in St. Clair and across Illinois. Illinois 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 TR 37A?
TR 37A in St. Clair, Illinois on the FHWA's 0–9 scale.
How often is TR 37A inspected?
TR 37A'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 575 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. TR 37A is currently shown as Good condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for TR 37A?
TR 37A has an NBI inventory load rating of 32.4 metric tons.
Who is responsible for maintaining TR 37A?
TR 37A is owned and maintained by Town/Township Highway Agency.
How old is TR 37A and does age affect safety?
TR 37A was built in 1989, making it 37 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.