Circumferential WB over Merrimack River CSX
GoodHillsborough County, New Hampshire · Nashua-Hudson Tl · Structure no. 017701570005900
- Built
- 1973
- 52 years old, rebuilt 1999
- Condition
- Good
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 772 ft
- 4 main spans
- Daily traffic
- 50,841
- 2023 count
- Owner
- Toll Authority
- State Toll Authority
About this bridge
Circumferential WB over Merrimack River CSX is a steel continuous stringer/multi-beam or girder carrying Circumferential WB over Merrimack River CSX in Hillsborough County, New Hampshire. It was built in 1973 and reconstructed in 1999, so it is 52 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 50,841 vehicles a day, roughly 5% of them trucks, projected to reach 75,244 by 2043. The structure is 772 ft (235.3 m) long and 62 ft wide. If it were closed, the detour would be 6.8 mi (11 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Circumferential WB over Merrimack River CSX built?
It was built in 1973, making it 52 years old in 2025. It was reconstructed in 1999.
What condition is Circumferential WB over Merrimack River CSX in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.
How much traffic does Circumferential WB over Merrimack River CSX carry?
About 50,841 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is Circumferential WB over Merrimack River CSX?
The structure is 772 ft (235.3 m) long with a longest span of 216 ft (65.8 m) and a deck 62 ft wide.
Who owns Circumferential WB over Merrimack River CSX?
It is owned by the State Toll Authority.