THO CR 46
Carrying THO CR 46 over ZEIGLER DITCH TH
.82 MI E OF CR27, Seneca, Ohio
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
THO CR 46 in Seneca, Ohio sits above 19% of rated Ohio bridges on inventory load rating (29 t), while its 1979 build year is earlier than 62% of Seneca's recorded-year cohort (275 bridges).
THO CR 46 in Seneca, Ohio is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1979, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 5. 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 OH:7450214
INTERSTATE-ERA · STEEL · SINGLE-SPAN · DECK-LED · LOCAL-ADT · STANDARD-LOAD · CAT-FAIR
- INTERSTATE-ERA 1950–1979
- STEEL Steel
- SINGLE-SPAN Single span
- DECK-LED Deck-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: THO CR 46
The THO CR 46 bridge in Seneca, Ohio carries THO CR 46 over ZEIGLER DITCH TH. It was built in 1979, making it 47 years old today. The structure is built primarily of steel and spans 1 section, stretching 10.1 meters (33 feet) end to end. Daily traffic averages 385 vehicles, placing it in the lower-traffic tier of Ohio bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 5/9, superstructure at 6/9, substructure at 8/9. The weakest component sits in fair condition. No reported major component scores in the Poor range under the current federal condition thresholds.
How THO CR 46 compares
Age against the county: built in 1979, earlier than 170 of Seneca's 275 bridges with a recorded construction year (62%), against a county median build year of 1986. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Ohio bridges with a recorded inventory load rating (26,729 rated).
THO CR 46 vs every rated Ohio bridge
Inventory load rating (metric tons), FHWA NBI, this state
29 Top 81% higher than 19% of 26,729 bridges
rated Ohio 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.
Seneca inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 275 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
- 1979
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 10.1 m (33 ft)
- Deck Width
- 8.2 m (27 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 385 vehicles/day
- Structure Number
- 7450214
Condition Analysis
- • At 5/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • The superstructure (beams and supports above the deck) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
- • At 8/9, the substructure (piers and abutments) is in good shape and shows no significant wear.
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 THO CR 46 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 THO CR 46 against other structures in Seneca and across Ohio. Ohio 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 THO CR 46?
THO CR 46 in Seneca, Ohio has a deck rating of 5/9, superstructure rating of 6/9, and substructure rating of 8/9 on the FHWA's 0–9 scale.
How often is THO CR 46 inspected?
THO CR 46'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 385 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. THO CR 46 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 THO CR 46?
THO CR 46 has an NBI inventory load rating of 29.2 metric tons.
Who is responsible for maintaining THO CR 46?
THO CR 46 is owned and maintained by County Highway Agency.
How old is THO CR 46 and does age affect safety?
THO CR 46 was built in 1979, making it 47 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.