I-93 SB over Merrimack River CSX RD
FairHillsborough County, New Hampshire · Manchester-Hooksett Tl · Structure no. 016100600008600
- Built
- 1976
- 49 years old, rebuilt 2011
- Condition
- Fair
- inspected April 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 826 ft
- 4 main spans
- Daily traffic
- 34,000
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-93 SB over Merrimack River CSX RD is a steel continuous stringer/multi-beam or girder carrying I-93 SB over Merrimack River CSX RD in Hillsborough County, New Hampshire. It was built in 1976 and reconstructed in 2011, so it is 49 years old, younger than the New Hampshire average of 56.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 34,000 vehicles a day, roughly 6% of them trucks, projected to reach 50,320 by 2043. The structure is 826 ft (251.8 m) long and 69 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 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-93 SB over Merrimack River CSX RD built?
It was built in 1976, making it 49 years old in 2025. It was reconstructed in 2011.
What condition is I-93 SB over Merrimack River CSX RD in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.
How much traffic does I-93 SB over Merrimack River CSX RD carry?
About 34,000 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is I-93 SB over Merrimack River CSX RD?
The structure is 826 ft (251.8 m) long with a longest span of 228 ft (69.5 m) and a deck 69 ft wide.
Who owns I-93 SB over Merrimack River CSX RD?
It is owned by the State Highway Agency.