PLANK ROAD
Carrying PLANK ROAD over MAD RIVER
100W OF HARPERS FERRY RD, Unknown County, Connecticut
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
PLANK ROAD in Unknown County, Connecticut sits above 35% of rated Connecticut bridges on inventory load rating (34 t), while its 2015 build year is earlier than 4% of Unknown County's recorded-year cohort (893 bridges).
PLANK ROAD in Unknown County, Connecticut is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 2015, it carries 1 rated component 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 CT:05668
POST-2000 · CONCRETE · MULTI-SPAN · CULVERT-LED · ARTERIAL-ADT · STANDARD-LOAD · CAT-GOOD
- POST-2000 2000+
- CONCRETE Concrete
- MULTI-SPAN 3 spans
- CULVERT-LED Culvert-led
- ARTERIAL-ADT Arterial 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.
Structural health score
A composite of the deck, superstructure, and substructure NBI condition ratings plus the inventory load rating, benchmarked against the full national bridge corpus, distinct from the Good/Fair/Poor category above.
Bridge Snapshot: PLANK ROAD
The PLANK ROAD bridge in Unknown County, Connecticut carries PLANK ROAD over MAD RIVER. It was built in 2015, making it 11 years old today. The structure is built primarily of concrete and spans 3 sections, stretching 14.0 meters (46 feet) end to end. Daily traffic averages 3,100 vehicles, placing it in the moderately-trafficked tier of Connecticut bridges. It is owned and maintained by City/Municipal Highway Agency.
The latest FHWA inspection places the weakest component in good condition (see the full component ratings below). All reported major components score above the Poor range.
How PLANK ROAD compares
Age against the county: built in 2015, earlier than 38 of Unknown County's 893 bridges with a recorded construction year (4%), against a county median build year of 1965. This is one of the newer structures in its county.
Live comparison across Connecticut bridges with a recorded inventory load rating (4,365 rated).
PLANK ROAD vs every rated Connecticut bridge
Inventory load rating (metric tons), FHWA NBI, this state
34 Top 65% higher than 35% of 4,365 bridges
rated Connecticut 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.
Unknown County inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 893 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
- 2015
- Material
- Concrete
- Number of Spans
- 3
- Structure Length
- 14.0 m (46 ft)
- Deck Width
- 13.9 m (46 ft)
- Owner
- City/Municipal Highway Agency
- Avg Daily Traffic
- 3,100 vehicles/day
- Structure Number
- 05668
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 PLANK ROAD 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 PLANK ROAD against other structures in Unknown County and across Connecticut. Connecticut 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 PLANK ROAD?
PLANK ROAD in Unknown County, Connecticut on the FHWA's 0–9 scale.
How often is PLANK ROAD inspected?
PLANK ROAD'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 3,100 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. PLANK ROAD 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 PLANK ROAD?
PLANK ROAD has an NBI inventory load rating of 34.0 metric tons.
Who is responsible for maintaining PLANK ROAD?
PLANK ROAD is owned and maintained by City/Municipal Highway Agency.
How old is PLANK ROAD and does age affect safety?
PLANK ROAD was built in 2015, making it 11 years old.
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.