I 495 SB over ST110 /ST113/MERRIMACK
PoorEssex County, Massachusetts · At Merrimac River · Structure no. M170312XGDOTNBI
- Built
- 1963
- 62 years old
- Condition
- Poor
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 172 ft
- 3 main spans
- Daily traffic
- 63,024
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
I 495 SB over ST110 /ST113/MERRIMACK is a steel stringer/multi-beam or girder carrying I 495 SB over ST110 /ST113/MERRIMACK in Essex County, Massachusetts. It was built in 1963, so it is 62 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 63,024 vehicles a day, roughly 6% of them trucks, projected to reach 80,623 by 2032. The structure is 172 ft (52.5 m) long and 52 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 | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 495 SB over ST110 /ST113/MERRIMACK built?
It was built in 1963, making it 62 years old in 2025.
What condition is I 495 SB over ST110 /ST113/MERRIMACK 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 2024.
How much traffic does I 495 SB over ST110 /ST113/MERRIMACK carry?
About 63,024 vehicles per day (2024 count), of which roughly 6% are trucks.
How long is I 495 SB over ST110 /ST113/MERRIMACK?
The structure is 172 ft (52.5 m) long with a longest span of 68 ft (20.7 m) and a deck 52 ft wide.
Who owns I 495 SB over ST110 /ST113/MERRIMACK?
It is owned by the State Highway Agency.