COUNTY RD 646
Carrying COUNTY RD 646 over DRAIN DTCH
S 6 T 23 N R 13 E, New Madrid, Missouri
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: COUNTY RD 646
The COUNTY RD 646 bridge in New Madrid, Missouri carries COUNTY RD 646 over DRAIN DTCH. It was built in 1955, making it 71 years old today. It was last reconstructed in 1986, extending its service life. The structure is built primarily of concrete and spans 1 section, stretching 11.0 meters (36 feet) end to end. Daily traffic averages 15 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 7/9, superstructure at 7/9, substructure at 8/9. The weakest component sits in good condition. No reported major component scores in the Poor range under the current federal condition thresholds. Its NBI inventory load rating is 22.5 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How COUNTY RD 646 compares
Live comparison across Missouri.
Historical Sufficiency Rating
PlainBridge-computedFHWA discontinued this calculated item; it does not determine current condition, funding eligibility, posting, or closure. How the historical reference is calculated.
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Structural Details
- Year Built
- 1955
- Last Reconstructed
- 1986
- Material
- Concrete
- Number of Spans
- 1
- Structure Length
- 11.0 m (36 ft)
- Deck Width
- 7.5 m (25 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 15 vehicles/day
- Structure Number
- 13323
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 7/9, the deck (driving surface) is in good shape and shows no significant wear.
- • At 7/9, the superstructure (beams and supports above the deck) is in good shape and shows no significant wear.
- • At 8/9, the substructure (piers and abutments) is in good shape and shows no significant wear.
How to read this record
This page shows what the last federal inspection recorded, not whether COUNTY RD 646 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 COUNTY RD 646 against other structures in New Madrid 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 COUNTY RD 646?
COUNTY RD 646 in New Madrid, Missouri has a deck rating of 7/9, superstructure rating of 7/9, and substructure rating of 8/9 on the FHWA's 0–9 scale.
How often is COUNTY RD 646 inspected?
COUNTY RD 646'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 15 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. COUNTY RD 646 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 COUNTY RD 646?
COUNTY RD 646 has an NBI inventory load rating of 22.5 metric tons.
Who is responsible for maintaining COUNTY RD 646?
COUNTY RD 646 is owned and maintained by County Highway Agency.
How old is COUNTY RD 646 and does age affect safety?
COUNTY RD 646 was built in 1955, making it 71 years old and last reconstructed in 1986.
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.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.