US 20 COMM AV/MBTA
Carrying US 20 COMM AV/MBTA over COMB I 90 & MBTA/CSX
.1MI.S.STORROW DR S48, Suffolk, Massachusetts
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
US 20 COMM AV/MBTA in Suffolk, Massachusetts is rated Good in the FHWA's 2024 National Bridge Inventory.
Built in 1965, it carries 3 rated components 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 MA:B160554T0DOTNBI
INTERSTATE-ERA · STEEL · MULTI-SPAN · TIED-CTRL · HEAVY-ADT · STANDARD-LOAD · CAT-GOOD
- INTERSTATE-ERA 1950–1979
- STEEL Steel
- MULTI-SPAN 3 spans
- TIED-CTRL Tied control
- HEAVY-ADT Heavy 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.
Bridge Snapshot: US 20 COMM AV/MBTA
The US 20 COMM AV/MBTA bridge in Suffolk, Massachusetts carries US 20 COMM AV/MBTA over COMB I 90 & MBTA/CSX. It was built in 1965, making it 61 years old today. It was last reconstructed in 2018, extending its service life. The structure is built primarily of steel and spans 3 sections, stretching 115.8 meters (380 feet) end to end. Daily traffic averages 40,783 vehicles, placing it in the heavily-trafficked tier of Massachusetts bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 7/9, substructure at 7/9. The weakest component sits in good condition. None of this bridge's reported major components fall into the Poor condition range.
How US 20 COMM AV/MBTA compares
Age against the county: built in 1965, earlier than 253 of Suffolk's 488 bridges with a recorded construction year (52%), against a county median build year of 1970. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Massachusetts bridges with a recorded inventory load rating (5,295 rated).
US 20 COMM AV/MBTA vs every rated Massachusetts bridge
Inventory load rating (metric tons), FHWA NBI, this state
39 Top 43% higher than 57% of 5,295 bridges
rated Massachusetts 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.
Suffolk inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 489 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
- 1965
- Last Reconstructed
- 2018
- Material
- Steel
- Number of Spans
- 3
- Structure Length
- 115.8 m (380 ft)
- Deck Width
- 49.4 m (162 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 40,783 vehicles/day
- Structure Number
- B160554T0DOTNBI
Condition Analysis
- • The deck (driving surface) rates good at 7/9, with no significant deterioration on file.
- • At 7/9, the superstructure (beams and supports above the deck) is in good shape and shows no significant wear.
- • At 7/9, 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 US 20 COMM AV/MBTA 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 US 20 COMM AV/MBTA against other structures in Suffolk and across Massachusetts. Massachusetts 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 US 20 COMM AV/MBTA?
US 20 COMM AV/MBTA in Suffolk, Massachusetts has a deck rating of 7/9, superstructure rating of 7/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is US 20 COMM AV/MBTA inspected?
US 20 COMM AV/MBTA'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 40,783 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. US 20 COMM AV/MBTA 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 US 20 COMM AV/MBTA?
US 20 COMM AV/MBTA has an NBI inventory load rating of 38.9 metric tons.
Who is responsible for maintaining US 20 COMM AV/MBTA?
US 20 COMM AV/MBTA is owned and maintained by State Highway Agency.
How old is US 20 COMM AV/MBTA and does age affect safety?
US 20 COMM AV/MBTA was built in 1965, making it 61 years old and last reconstructed in 2018.
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.