OLD DIXBORO ROAD
Carrying OLD DIXBORO ROAD over HURON RIVER
ANN ARBOR TWP SEC 36, Washtenaw, Michigan
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
OLD DIXBORO ROAD in Washtenaw, Michigan sits above 5% of rated Michigan bridges on inventory load rating (18 t), while its 1921 build year is earlier than 97% of Washtenaw's recorded-year cohort (262 bridges).
OLD DIXBORO ROAD in Washtenaw, Michigan is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1921, 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:000000000010973
PRE-1950 · STEEL · SINGLE-SPAN · TIED-CTRL · HEAVY-ADT · LIGHT-LOAD · CAT-POOR
- PRE-1950 Pre-1950
- STEEL Steel
- SINGLE-SPAN Single span
- TIED-CTRL Tied control
- HEAVY-ADT Heavy ADT
- LIGHT-LOAD Light 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: OLD DIXBORO ROAD
The OLD DIXBORO ROAD bridge in Washtenaw, Michigan carries OLD DIXBORO ROAD over HURON RIVER. It was built in 1921, making it 105 years old today. It was last reconstructed in 1969, extending its service life. The structure is built primarily of steel and spans 1 section, stretching 17.0 meters (56 feet) end to end. Daily traffic averages 16,342 vehicles, placing it in the heavily-trafficked tier of Michigan bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 4/9, superstructure at 5/9, substructure at 4/9. 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 OLD DIXBORO ROAD compares
Age against the county: built in 1921, earlier than 255 of Washtenaw's 262 bridges with a recorded construction year (97%), against a county median build year of 1971. 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).
OLD DIXBORO ROAD vs every rated Michigan bridge
Inventory load rating (metric tons), FHWA NBI, this state
18 Top 95% higher than 5% 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.
Washtenaw inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 262 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
- 1921
- Last Reconstructed
- 1969
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 17.0 m (56 ft)
- Deck Width
- 10.9 m (36 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 16,342 vehicles/day
- Structure Number
- 000000000010973
Condition Analysis
- • At 4/9, the deck (driving surface) is in poor shape, with advanced wear on file for this vintage.
- • At 5/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • The substructure (piers and abutments) rates poor at 4/9, with advanced deterioration recorded on the latest inspection.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
OLD DIXBORO ROAD 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 OLD DIXBORO ROAD against other structures in Washtenaw 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 OLD DIXBORO ROAD?
OLD DIXBORO ROAD in Washtenaw, Michigan has a deck rating of 4/9, superstructure rating of 5/9, and substructure rating of 4/9 on the FHWA's 0–9 scale.
How often is OLD DIXBORO ROAD inspected?
OLD DIXBORO ROAD'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 16,342 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. OLD DIXBORO ROAD 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 OLD DIXBORO ROAD?
OLD DIXBORO ROAD has an NBI inventory load rating of 18.1 metric tons.
Who is responsible for maintaining OLD DIXBORO ROAD?
OLD DIXBORO ROAD is owned and maintained by County Highway Agency.
How old is OLD DIXBORO ROAD and does age affect safety?
OLD DIXBORO ROAD was built in 1921, making it 105 years old and last reconstructed in 1969.
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.