M-155
Carrying M-155 over S BR SHIAWASSEE RIVER
2.0 MI SW OF HOWELL, Livingston, Michigan
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
M-155 in Livingston, Michigan sits above 89% of rated Michigan bridges on inventory load rating (59 t), while its 2007 build year is earlier than 14% of Livingston's recorded-year cohort (165 bridges).
M-155 in Livingston, Michigan is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 2007, 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 MI:000000000005801
POST-2000 · CONCRETE · SINGLE-SPAN · CULVERT-LED · ARTERIAL-ADT · HEAVY-LOAD · CAT-GOOD
- POST-2000 2000+
- CONCRETE Concrete
- SINGLE-SPAN Single span
- CULVERT-LED Culvert-led
- ARTERIAL-ADT Arterial ADT
- HEAVY-LOAD Heavy 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: M-155
The M-155 bridge in Livingston, Michigan carries M-155 over S BR SHIAWASSEE RIVER. It was built in 2007, making it 19 years old today. The structure is built primarily of concrete and spans 1 section, stretching 10.4 meters (34 feet) end to end. Daily traffic averages 4,056 vehicles, placing it in the moderately-trafficked tier of Michigan bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show culvert at 7/9. The weakest component sits in good condition. All reported major components score above the Poor range.
How M-155 compares
Age against the county: built in 2007, earlier than 23 of Livingston's 165 bridges with a recorded construction year (14%), against a county median build year of 1962. This is one of the newer structures in its county.
Live comparison across Michigan bridges with a recorded inventory load rating (11,366 of 11,371 rated).
M-155 vs every rated Michigan bridge
Inventory load rating (metric tons), FHWA NBI, this state
59 Top 11% higher than 89% 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.
Livingston inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 165 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
- 2007
- Material
- Concrete
- Number of Spans
- 1
- Structure Length
- 10.4 m (34 ft) 0
- Owner
- State Highway Agency
- Avg Daily Traffic
- 4,056 vehicles/day
- Structure Number
- 000000000005801
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 M-155 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 M-155 against other structures in Livingston 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 M-155?
M-155 in Livingston, Michigan on the FHWA's 0–9 scale.
How often is M-155 inspected?
M-155'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 4,056 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. M-155 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 M-155?
M-155 has an NBI inventory load rating of 58.6 metric tons.
Who is responsible for maintaining M-155?
M-155 is owned and maintained by State Highway Agency.
How old is M-155 and does age affect safety?
M-155 was built in 2007, making it 19 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.