Nh 31 over Souhegan River
GoodHillsborough County, New Hampshire · 0.1 Mi. from Jct. Nh 101 · Structure no. 027701290012600
- Built
- 1971
- 54 years old, rebuilt 2014
- Condition
- Good
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 79 ft
- 1 main span
- Daily traffic
- 1,924
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Nh 31 over Souhegan River is a steel stringer/multi-beam or girder carrying Nh 31 over Souhegan River in Hillsborough County, New Hampshire. It was built in 1971 and reconstructed in 2014, so it is 54 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 1,924 vehicles a day, roughly 4% of them trucks, projected to reach 2,847 by 2043. The structure is 79 ft (24.1 m) long and 40 ft wide. If it were closed, the detour would be 3.1 mi (5 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 Nh 31 over Souhegan River built?
It was built in 1971, making it 54 years old in 2025. It was reconstructed in 2014.
What condition is Nh 31 over Souhegan River 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 Nh 31 over Souhegan River carry?
About 1,924 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is Nh 31 over Souhegan River?
The structure is 79 ft (24.1 m) long with a longest span of 75 ft (22.9 m) and a deck 40 ft wide.
Who owns Nh 31 over Souhegan River?
It is owned by the State Highway Agency.