399TH ST
Carrying 399TH ST over NB & SB US69 HWY
.98 Miles N of SCOLN, Miami, Kansas
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
399TH ST in Miami, Kansas sits above 76% of rated Kansas bridges on inventory load rating (38 t), while its 2004 build year is earlier than 17% of Miami's recorded-year cohort (326 bridges).
399TH ST in Miami, Kansas is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 2004, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 8. 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 KS:999906900611121
POST-2000 · STEEL · LONG-SPAN-RUN · TIED-CTRL · TRACE-ADT · STANDARD-LOAD · CAT-GOOD
- POST-2000 2000+
- STEEL Steel
- LONG-SPAN-RUN 4 spans
- 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: 399TH ST
The 399TH ST bridge in Miami, Kansas carries 399TH ST over NB & SB US69 HWY. It was built in 2004, making it 22 years old today. The structure is built primarily of steel continuous and spans 4 sections, stretching 89.9 meters (295 feet) end to end. Daily traffic averages 38 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 a deck rating of 8/9, superstructure at 8/9, substructure at 8/9. The weakest component sits in good condition. None of this bridge's reported major components fall into the Poor condition range.
How 399TH ST compares
Age against the county: built in 2004, earlier than 56 of Miami's 326 bridges with a recorded construction year (17%), against a county median build year of 1979. This is one of the newer structures in its county.
Live comparison across Kansas bridges with a recorded inventory load rating (24,893 of 24,894 rated).
399TH ST vs every rated Kansas bridge
Inventory load rating (metric tons), FHWA NBI, this state
38 Top 24% higher than 76% 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.
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.
Miami inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 326 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
- 2004
- Material
- Steel Continuous
- Number of Spans
- 4
- Structure Length
- 89.9 m (295 ft)
- Deck Width
- 11.6 m (38 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 38 vehicles/day
- Structure Number
- 999906900611121
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) is in good condition (8/9), showing no significant deterioration.
- • The substructure (piers and abutments) rates good at 8/9, with no significant deterioration on file.
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 399TH 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 399TH ST against other structures in Miami 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 399TH ST?
399TH ST in Miami, Kansas has a deck rating of 8/9, superstructure rating of 8/9, and substructure rating of 8/9 on the FHWA's 0–9 scale.
How often is 399TH ST inspected?
399TH 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 38 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 399TH 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 399TH ST?
399TH ST has an NBI inventory load rating of 37.6 metric tons.
Who is responsible for maintaining 399TH ST?
399TH ST is owned and maintained by State Highway Agency.
How old is 399TH ST and does age affect safety?
399TH ST was built in 2004, making it 22 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.