NW 12TH ST
Carrying NW 12TH ST over W MUDDY CR
S 29 T 63 N R 24 W, Grundy, Missouri
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
NW 12TH ST in Grundy, Missouri sits above 58% of rated Missouri bridges on inventory load rating (35 t), while its 2006 build year is earlier than 24% of Grundy's recorded-year cohort (187 bridges).
NW 12TH ST in Grundy, Missouri is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 2006, it carries 3 rated components 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 MO:31472
POST-2000 · STEEL · SINGLE-SPAN · TIED-CTRL · TRACE-ADT · STANDARD-LOAD · CAT-GOOD
- POST-2000 2000+
- STEEL Steel
- SINGLE-SPAN Single span
- TIED-CTRL Tied control
- TRACE-ADT Trace 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: NW 12TH ST
The NW 12TH ST bridge in Grundy, Missouri carries NW 12TH ST over W MUDDY CR. It was built in 2006, making it 20 years old today. The structure is built primarily of steel and spans 1 section, stretching 24.5 meters (80 feet) end to end. Daily traffic averages 5 vehicles, placing it in the lower-traffic tier of Missouri bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 8/9, superstructure at 7/9, substructure at 7/9. The weakest component sits in good condition. All reported major components score above the Poor range.
How NW 12TH ST compares
Age against the county: built in 2006, earlier than 45 of Grundy's 187 bridges with a recorded construction year (24%), against a county median build year of 1997. 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).
NW 12TH ST vs every rated Missouri bridge
Inventory load rating (metric tons), FHWA NBI, this state
35 Top 42% higher than 58% 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.
Grundy inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 187 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
- 2006
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 24.5 m (80 ft)
- Deck Width
- 7.7 m (25 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 5 vehicles/day
- Structure Number
- 31472
Condition Analysis
- • The deck (driving surface) rates good at 8/9, with no significant deterioration on file.
- • The superstructure (beams and supports above the deck) rates good at 7/9, with no significant deterioration on file.
- • The substructure (piers and abutments) is in good condition (7/9), showing no significant deterioration.
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 NW 12TH 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 NW 12TH ST against other structures in Grundy 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 NW 12TH ST?
NW 12TH ST in Grundy, Missouri has a deck rating of 8/9, superstructure rating of 7/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is NW 12TH ST inspected?
NW 12TH 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 5 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. NW 12TH ST 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 NW 12TH ST?
NW 12TH ST has an NBI inventory load rating of 35.1 metric tons.
Who is responsible for maintaining NW 12TH ST?
NW 12TH ST is owned and maintained by County Highway Agency.
How old is NW 12TH ST and does age affect safety?
NW 12TH ST was built in 2006, making it 20 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.