ST 3 CAMBRIDGE ST
Carrying ST 3 CAMBRIDGE ST over COMB ST3/ST28 & CHARLES
.2 MI W OF BLOSSOM ST, Suffolk, Massachusetts
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
ST 3 CAMBRIDGE ST in Suffolk, Massachusetts sits above 59% of rated Massachusetts bridges on inventory load rating (39 t), while its 1905 build year is earlier than 93% of Suffolk's recorded-year cohort (488 bridges).
ST 3 CAMBRIDGE ST in Suffolk, Massachusetts is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1905, 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 MA:B160094F0DOTNBI
PRE-1950 · STEEL · LONG-SPAN-RUN · SUPER-LED · HEAVY-ADT · STANDARD-LOAD · CAT-FAIR
- PRE-1950 Pre-1950
- STEEL Steel
- LONG-SPAN-RUN 11 spans
- SUPER-LED Superstructure-led
- 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: ST 3 CAMBRIDGE ST
The ST 3 CAMBRIDGE ST bridge in Suffolk, Massachusetts carries ST 3 CAMBRIDGE ST over COMB ST3/ST28 & CHARLES. It was built in 1905, making it 121 years old today. It was last reconstructed in 2018, extending its service life. The structure is built primarily of steel and spans 11 sections, stretching 650.7 meters (2135 feet) end to end. Daily traffic averages 29,100 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 5/9, substructure at 6/9. The weakest component sits in fair condition. All reported major components score above the Poor range.
How ST 3 CAMBRIDGE ST compares
Age against the county: built in 1905, earlier than 452 of Suffolk's 488 bridges with a recorded construction year (93%), 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).
ST 3 CAMBRIDGE ST vs every rated Massachusetts bridge
Inventory load rating (metric tons), FHWA NBI, this state
39 Top 41% higher than 59% 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
- 1905
- Last Reconstructed
- 2018
- Material
- Steel
- Number of Spans
- 11
- Structure Length
- 650.7 m (2135 ft)
- Deck Width
- 32.5 m (107 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 29,100 vehicles/day
- Structure Number
- B160094F0DOTNBI
Condition Analysis
- • At 6/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • The superstructure (beams and supports above the deck) rates fair at 5/9, minor deterioration that routine maintenance should address.
- • At 6/9, 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 ST 3 CAMBRIDGE 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 ST 3 CAMBRIDGE 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 ST 3 CAMBRIDGE ST?
ST 3 CAMBRIDGE ST in Suffolk, Massachusetts has a deck rating of 6/9, superstructure rating of 5/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is ST 3 CAMBRIDGE ST inspected?
ST 3 CAMBRIDGE 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 29,100 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. ST 3 CAMBRIDGE 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 ST 3 CAMBRIDGE ST?
ST 3 CAMBRIDGE ST has an NBI inventory load rating of 39.4 metric tons.
Who is responsible for maintaining ST 3 CAMBRIDGE ST?
ST 3 CAMBRIDGE ST is owned and maintained by State Highway Agency.
How old is ST 3 CAMBRIDGE ST and does age affect safety?
ST 3 CAMBRIDGE ST was built in 1905, making it 121 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.