I 495 SB over HWY W Main ST
PoorMiddlesex County, Massachusetts · Mm 54.6 · Structure no. H230111URDOTNBI
- Built
- 1966
- 59 years old
- Condition
- Poor
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 133 ft
- 2 main spans
- Daily traffic
- 38,043
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 495 SB over HWY W Main ST is a steel stringer/multi-beam or girder carrying I 495 SB over HWY W Main ST in Middlesex County, Massachusetts. It was built in 1966, so it is 59 years old, younger than the Massachusetts average of 63.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: open, would be posted or closed except for temporary shoring.
It carries about 38,043 vehicles a day, roughly 7% of them trucks, projected to reach 156,207 by 2031. The structure is 133 ft (40.5 m) long and 62 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 495 SB over HWY W Main ST built?
It was built in 1966, making it 59 years old in 2025.
What condition is I 495 SB over HWY W Main ST in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.
How much traffic does I 495 SB over HWY W Main ST carry?
About 38,043 vehicles per day (2023 count), of which roughly 7% are trucks.
How long is I 495 SB over HWY W Main ST?
The structure is 133 ft (40.5 m) long with a longest span of 66 ft (20.1 m) and a deck 62 ft wide.
Who owns I 495 SB over HWY W Main ST?
It is owned by the State Highway Agency.