CANAAN MOUNTAIN RD
Carrying CANAAN MOUNTAIN RD over WANGUM LAKE BROOK
NORTH OF UNDER MTN RD, Unknown County, Connecticut
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
CANAAN MOUNTAIN RD in Unknown County, Connecticut sits above 62% of rated Connecticut bridges on inventory load rating (45 t), while its 1988 build year is earlier than 27% of Unknown County's recorded-year cohort (471 bridges).
CANAAN MOUNTAIN RD in Unknown County, Connecticut is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1988, 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 CT:05659
LATE-CENTURY · TIMBER · SINGLE-SPAN · SUB-LED · LOCAL-ADT · HEAVY-LOAD · CAT-FAIR
- LATE-CENTURY 1980–1999
- TIMBER Wood or timber
- SINGLE-SPAN Single span
- SUB-LED Substructure-led
- LOCAL-ADT Local ADT
- HEAVY-LOAD Heavy 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.
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: CANAAN MOUNTAIN RD
The CANAAN MOUNTAIN RD bridge in Unknown County, Connecticut carries CANAAN MOUNTAIN RD over WANGUM LAKE BROOK. It was built in 1988, making it 38 years old today. The structure is built primarily of wood or timber and spans 1 section, stretching 9.4 meters (31 feet) end to end. Daily traffic averages 125 vehicles, placing it in the lower-traffic tier of Connecticut bridges. It is owned and maintained by Town/Township Highway Agency.
The latest FHWA inspection places the weakest component in fair condition (see the full component ratings below). All reported major components score above the Poor range.
How CANAAN MOUNTAIN RD compares
Age against the county: built in 1988, earlier than 129 of Unknown County's 471 bridges with a recorded construction year (27%), against a county median build year of 1964. This is one of the newer structures in its county.
Live comparison across Connecticut bridges with a recorded inventory load rating (4,365 rated).
CANAAN MOUNTAIN RD vs every rated Connecticut bridge
Inventory load rating (metric tons), FHWA NBI, this state
45 Top 38% higher than 62% 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.
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.
Unknown County inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 471 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
- 1988
- Material
- Wood or Timber
- Number of Spans
- 1
- Structure Length
- 9.4 m (31 ft)
- Deck Width
- 6.4 m (21 ft)
- Owner
- Town/Township Highway Agency
- Avg Daily Traffic
- 125 vehicles/day
- Structure Number
- 05659
Condition Analysis
- • The deck (driving surface) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
- • The superstructure (beams and supports above the deck) is in good condition (7/9), showing no significant deterioration.
- • At 5/9, the substructure (piers and abutments) shows fair condition, with minor wear flagged for upkeep.
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 CANAAN MOUNTAIN RD 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 CANAAN MOUNTAIN RD 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 CANAAN MOUNTAIN RD?
CANAAN MOUNTAIN RD in Unknown County, Connecticut has a deck rating of 6/9, superstructure rating of 7/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is CANAAN MOUNTAIN RD inspected?
CANAAN MOUNTAIN RD'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 125 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. CANAAN MOUNTAIN RD 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 CANAAN MOUNTAIN RD?
CANAAN MOUNTAIN RD has an NBI inventory load rating of 44.8 metric tons.
Who is responsible for maintaining CANAAN MOUNTAIN RD?
CANAAN MOUNTAIN RD is owned and maintained by Town/Township Highway Agency.
How old is CANAAN MOUNTAIN RD and does age affect safety?
CANAAN MOUNTAIN RD was built in 1988, making it 38 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.