K31 HWY
Carrying K31 HWY over MARAIS DES CYGNES R DRN
0.35 MI EAST OF 75 JCT, Osage, Kansas
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
K31 HWY in Osage, Kansas sits above 29% of rated Kansas bridges on inventory load rating (20 t), while its 1936 build year is earlier than 83% of Osage's recorded-year cohort (304 bridges).
K31 HWY in Osage, Kansas is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1936, it carries 1 rated component on the inspecting agency's 0-9 scale, and its weakest reported component scores 6. The lowest applicable rating sets the federal condition category, so this Fair 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 KS:999903100700661
PRE-1950 · CONCRETE · MULTI-SPAN · CULVERT-LED · LOCAL-ADT · STANDARD-LOAD · CAT-FAIR
- PRE-1950 Pre-1950
- CONCRETE Concrete
- MULTI-SPAN 2 spans
- CULVERT-LED Culvert-led
- LOCAL-ADT Local ADT
- STANDARD-LOAD Standard load
- CAT-FAIR Fair
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: K31 HWY
The K31 HWY bridge in Osage, Kansas carries K31 HWY over MARAIS DES CYGNES R DRN. It was built in 1936, making it 90 years old today. It was last reconstructed in 1957, extending its service life. The structure is built primarily of concrete and spans 2 sections, stretching 6.3 meters (21 feet) end to end. Daily traffic averages 450 vehicles, placing it in the lower-traffic tier of Kansas bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show culvert at 6/9. The weakest component sits in fair condition. All reported major components score above the Poor range.
How K31 HWY compares
Age against the county: built in 1936, earlier than 253 of Osage's 304 bridges with a recorded construction year (83%), against a county median build year of 1973. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Kansas bridges with a recorded inventory load rating (24,893 of 24,894 rated).
K31 HWY vs every rated Kansas bridge
Inventory load rating (metric tons), FHWA NBI, this state
20 Top 71% higher than 29% of 24,893 bridges
rated Kansas 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.
Osage inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 304 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
- 1936
- Last Reconstructed
- 1957
- Material
- Concrete
- Number of Spans
- 2
- Structure Length
- 6.3 m (21 ft)
- Deck Width
- 14.5 m (48 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 450 vehicles/day
- Structure Number
- 999903100700661
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 K31 HWY 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 K31 HWY against other structures in Osage and across Kansas. Kansas 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 K31 HWY?
K31 HWY in Osage, Kansas on the FHWA's 0–9 scale.
How often is K31 HWY inspected?
K31 HWY'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 450 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. K31 HWY is currently shown as Fair condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for K31 HWY?
K31 HWY has an NBI inventory load rating of 20.0 metric tons.
Who is responsible for maintaining K31 HWY?
K31 HWY is owned and maintained by State Highway Agency.
How old is K31 HWY and does age affect safety?
K31 HWY was built in 1936, making it 90 years old and last reconstructed in 1957.
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.