US 4 Nh 10 over Mascoma River
GoodGrafton County, New Hampshire · 6.4 MI from Hanover Tl · Structure no. 014401200011500
- Built
- 1954
- 71 years old, rebuilt 2019
- Condition
- Good
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 66 ft
- 1 main span
- Daily traffic
- 8,395
- 2023 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
US 4 Nh 10 over Mascoma River is a steel stringer/multi-beam or girder carrying US 4 Nh 10 over Mascoma River in Grafton County, New Hampshire. It was built in 1954 and reconstructed in 2019, so it is 71 years old, older 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 8,395 vehicles a day, roughly 5% of them trucks, projected to reach 12,424 by 2043. The structure is 66 ft (20.1 m) long and 57 ft wide. If it were closed, the detour would be 5 mi (8 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 | 9 Excellent | No problems noted. |
| Superstructure | 9 Excellent | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 4 Nh 10 over Mascoma River built?
It was built in 1954, making it 71 years old in 2025. It was reconstructed in 2019.
What condition is US 4 Nh 10 over Mascoma 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 July 2024.
How much traffic does US 4 Nh 10 over Mascoma River carry?
About 8,395 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is US 4 Nh 10 over Mascoma River?
The structure is 66 ft (20.1 m) long with a longest span of 62 ft (18.9 m) and a deck 57 ft wide.
Who owns US 4 Nh 10 over Mascoma River?
It is owned by the City or Municipal Highway Agency.