I 495 NB over ST133 Andover ST
PoorMiddlesex County, Massachusetts · Rt 495 at Rt 133 · Structure no. T030142JUDOTNBI
- Built
- 1961
- 64 years old
- Condition
- Poor
- inspected April 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 224 ft
- 3 main spans
- Daily traffic
- 60,988
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
I 495 NB over ST133 Andover ST is a steel stringer/multi-beam or girder carrying I 495 NB over ST133 Andover ST in Middlesex County, Massachusetts. It was built in 1961, so it is 64 years old, older 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 4 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 60,988 vehicles a day, roughly 9% of them trucks, projected to reach 189,516 by 2031. The structure is 224 ft (68.3 m) long and 60 ft wide. If it were closed, the detour would be 4.3 mi (7 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 495 NB over ST133 Andover ST built?
It was built in 1961, making it 64 years old in 2025.
What condition is I 495 NB over ST133 Andover 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 April 2023.
How much traffic does I 495 NB over ST133 Andover ST carry?
About 60,988 vehicles per day (2019 count), of which roughly 9% are trucks.
How long is I 495 NB over ST133 Andover ST?
The structure is 224 ft (68.3 m) long with a longest span of 109 ft (33.2 m) and a deck 60 ft wide.
Who owns I 495 NB over ST133 Andover ST?
It is owned by the State Highway Agency.