ALPHA AVENUE
Carrying ALPHA AVENUE over AMTRAK RR & LOCAL ROADS
1000 FT SOUTH OF ROUTE 1A, Unknown County, Connecticut
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
ALPHA AVENUE in Unknown County, Connecticut sits above 1% of rated Connecticut bridges on inventory load rating (16 t), while its 1940 build year is earlier than 87% of Unknown County's recorded-year cohort (442 bridges).
ALPHA AVENUE in Unknown County, Connecticut is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1940, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 4. The lowest applicable rating sets the federal condition category, so this Poor 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:03906
PRE-1950 · STEEL · LONG-SPAN-RUN · SUB-LED · ARTERIAL-ADT · LIGHT-LOAD · CAT-POOR
- PRE-1950 Pre-1950
- STEEL Steel
- LONG-SPAN-RUN 8 spans
- SUB-LED Substructure-led
- ARTERIAL-ADT Arterial ADT
- LIGHT-LOAD Light load
- CAT-POOR Poor
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: ALPHA AVENUE
The ALPHA AVENUE bridge in Unknown County, Connecticut carries ALPHA AVENUE over AMTRAK RR & LOCAL ROADS. It was built in 1940, making it 86 years old today. It was last reconstructed in 1992, extending its service life. The structure is built primarily of steel continuous and spans 8 sections, stretching 190.5 meters (625 feet) end to end. Daily traffic averages 4,200 vehicles, placing it in the moderately-trafficked tier of Connecticut bridges. It is owned and maintained by Unknown.
The latest FHWA inspection places the weakest component in poor condition (see the full component ratings below). Because at least one major component scores 4 or lower, this bridge falls in FHWA's Poor condition category. That category is not a closure order.
How ALPHA AVENUE compares
Age against the county: built in 1940, earlier than 383 of Unknown County's 442 bridges with a recorded construction year (87%), against a county median build year of 1964. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Connecticut bridges with a recorded inventory load rating (4,365 rated).
ALPHA AVENUE vs every rated Connecticut bridge
Inventory load rating (metric tons), FHWA NBI, this state
16 Top 99% higher than 1% 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 442 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
- 1940
- Last Reconstructed
- 1992
- Material
- Steel Continuous
- Number of Spans
- 8
- Structure Length
- 190.5 m (625 ft)
- Deck Width
- 14.8 m (49 ft)
- Owner
- Unknown
- Avg Daily Traffic
- 4,200 vehicles/day
- Structure Number
- 03906
Condition Analysis
- • The deck (driving surface) is in good condition (7/9), showing no significant deterioration.
- • The superstructure (beams and supports above the deck) is in fair condition (5/9), with minor deterioration that may require routine maintenance.
- • The substructure (piers and abutments) rates poor at 4/9, with advanced deterioration recorded on the latest inspection.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
ALPHA AVENUE is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare ALPHA AVENUE 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 ALPHA AVENUE?
ALPHA AVENUE in Unknown County, Connecticut has a deck rating of 7/9, superstructure rating of 5/9, and substructure rating of 4/9 on the FHWA's 0–9 scale.
How often is ALPHA AVENUE inspected?
ALPHA AVENUE'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 4,200 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. ALPHA AVENUE is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for ALPHA AVENUE?
ALPHA AVENUE has an NBI inventory load rating of 16.2 metric tons.
Who is responsible for maintaining ALPHA AVENUE?
ALPHA AVENUE is owned and maintained by Unknown.
How old is ALPHA AVENUE and does age affect safety?
ALPHA AVENUE was built in 1940, making it 86 years old and last reconstructed in 1992.
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.