HWY SOUTHMPTN ST
Carrying HWY SOUTHMPTN ST over I 93 /US1/ST3
1.1 KM S OF JCT I90&93, Suffolk, Massachusetts
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
HWY SOUTHMPTN ST in Suffolk, Massachusetts sits above 54% of rated Massachusetts bridges on inventory load rating (38 t), while its 1958 build year is earlier than 63% of Suffolk's recorded-year cohort (488 bridges).
HWY SOUTHMPTN ST in Suffolk, Massachusetts is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1958, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 6. 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 MA:B162723F6DOTNBI
INTERSTATE-ERA · STEEL · LONG-SPAN-RUN · TIED-CTRL · HEAVY-ADT · STANDARD-LOAD · CAT-FAIR
- INTERSTATE-ERA 1950–1979
- STEEL Steel
- LONG-SPAN-RUN 4 spans
- TIED-CTRL Tied control
- HEAVY-ADT Heavy 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: HWY SOUTHMPTN ST
The HWY SOUTHMPTN ST bridge in Suffolk, Massachusetts carries HWY SOUTHMPTN ST over I 93 /US1/ST3. It was built in 1958, making it 68 years old today. It was last reconstructed in 1983, extending its service life. The structure is built primarily of steel and spans 4 sections, stretching 84.7 meters (278 feet) end to end. Daily traffic averages 29,741 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 6/9, superstructure at 6/9, substructure at 6/9. The weakest component sits in fair condition. All reported major components score above the Poor range.
How HWY SOUTHMPTN ST compares
Age against the county: built in 1958, earlier than 305 of Suffolk's 488 bridges with a recorded construction year (63%), 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).
HWY SOUTHMPTN ST vs every rated Massachusetts bridge
Inventory load rating (metric tons), FHWA NBI, this state
38 Top 46% higher than 54% 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
- 1958
- Last Reconstructed
- 1983
- Material
- Steel
- Number of Spans
- 4
- Structure Length
- 84.7 m (278 ft)
- Deck Width
- 21.3 m (70 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 29,741 vehicles/day
- Structure Number
- B162723F6DOTNBI
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) rates fair at 6/9, minor deterioration that routine maintenance should address.
- • The substructure (piers and abutments) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
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 HWY SOUTHMPTN ST 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 HWY SOUTHMPTN ST 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 HWY SOUTHMPTN ST?
HWY SOUTHMPTN ST in Suffolk, Massachusetts has a deck rating of 6/9, superstructure rating of 6/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is HWY SOUTHMPTN ST inspected?
HWY SOUTHMPTN ST'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 29,741 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. HWY SOUTHMPTN ST 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 HWY SOUTHMPTN ST?
HWY SOUTHMPTN ST has an NBI inventory load rating of 37.7 metric tons.
Who is responsible for maintaining HWY SOUTHMPTN ST?
HWY SOUTHMPTN ST is owned and maintained by State Highway Agency.
How old is HWY SOUTHMPTN ST and does age affect safety?
HWY SOUTHMPTN ST was built in 1958, making it 68 years old and last reconstructed in 1983.
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.