ALLINGTON RD
Carrying ALLINGTON RD over I-94
6.7 MI SW OF M-25, St. Clair, Michigan
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
ALLINGTON RD in St. Clair, Michigan sits above 55% of rated Michigan bridges on inventory load rating (41 t), while its 1964 build year is earlier than 79% of St. Clair's recorded-year cohort (327 bridges).
ALLINGTON RD in St. Clair, Michigan is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1964, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 4. The lowest applicable rating sets the federal condition category, so this Poor 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 MI:000000000010004
INTERSTATE-ERA · STEEL · LONG-SPAN-RUN · SUPER-LED · LOCAL-ADT · HEAVY-LOAD · CAT-POOR
- INTERSTATE-ERA 1950–1979
- STEEL Steel
- LONG-SPAN-RUN 4 spans
- SUPER-LED Superstructure-led
- LOCAL-ADT Local ADT
- HEAVY-LOAD Heavy load
- CAT-POOR Poor
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: ALLINGTON RD
The ALLINGTON RD bridge in St. Clair, Michigan carries ALLINGTON RD over I-94. It was built in 1964, making it 62 years old today. It was last reconstructed in 2008, extending its service life. The structure is built primarily of steel and spans 4 sections, stretching 88.9 meters (292 feet) end to end. Daily traffic averages 690 vehicles, placing it in the lower-traffic tier of Michigan bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 4/9, substructure at 7/9. The weakest component sits in poor condition. A component scored 4 or below, placing this bridge in the federal Poor condition category rather than declaring it unsafe or closed.
How ALLINGTON RD compares
Age against the county: built in 1964, earlier than 259 of St. Clair's 327 bridges with a recorded construction year (79%), against a county median build year of 1985. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Michigan bridges with a recorded inventory load rating (11,366 of 11,371 rated).
ALLINGTON RD vs every rated Michigan bridge
Inventory load rating (metric tons), FHWA NBI, this state
41 Top 45% higher than 55% of 11,366 bridges
rated Michigan 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. Clair inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 327 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
- 1964
- Last Reconstructed
- 2008
- Material
- Steel
- Number of Spans
- 4
- Structure Length
- 88.9 m (292 ft)
- Deck Width
- 9.6 m (31 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 690 vehicles/day
- Structure Number
- 000000000010004
Condition Analysis
- • The deck (driving surface) rates fair at 6/9, minor deterioration that routine maintenance should address.
- • The superstructure (beams and supports above the deck) rates poor at 4/9, with advanced deterioration recorded on the latest inspection.
- • At 7/9, the substructure (piers and abutments) is in good shape and shows no significant wear.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
ALLINGTON RD is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare ALLINGTON RD against other structures in St. Clair and across Michigan. Michigan 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 ALLINGTON RD?
ALLINGTON RD in St. Clair, Michigan has a deck rating of 6/9, superstructure rating of 4/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is ALLINGTON RD inspected?
ALLINGTON RD'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 690 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. ALLINGTON RD is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for ALLINGTON RD?
ALLINGTON RD has an NBI inventory load rating of 40.5 metric tons.
Who is responsible for maintaining ALLINGTON RD?
ALLINGTON RD is owned and maintained by State Highway Agency.
How old is ALLINGTON RD and does age affect safety?
ALLINGTON RD was built in 1964, making it 62 years old and last reconstructed in 2008.
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.
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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.