I-89 Nh 10 SB over US 4
GoodGrafton County, New Hampshire · 1.9 MI from Enfield T.L. · Structure no. 014401600010600
- Built
- 1966
- 59 years old, rebuilt 1987
- Condition
- Good
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 184 ft
- 3 main spans
- Daily traffic
- 21,937
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-89 Nh 10 SB over US 4 is a steel continuous stringer/multi-beam or girder carrying I-89 Nh 10 SB over US 4 in Grafton County, New Hampshire. It was built in 1966 and reconstructed in 1987, so it is 59 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 21,937 vehicles a day, roughly 9% of them trucks, projected to reach 32,466 by 2043. The structure is 184 ft (56.1 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-89 Nh 10 SB over US 4 built?
It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1987.
What condition is I-89 Nh 10 SB over US 4 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 June 2023.
How much traffic does I-89 Nh 10 SB over US 4 carry?
About 21,937 vehicles per day (2023 count), of which roughly 9% are trucks.
How long is I-89 Nh 10 SB over US 4?
The structure is 184 ft (56.1 m) long with a longest span of 77 ft (23.5 m) and a deck 48 ft wide.
Who owns I-89 Nh 10 SB over US 4?
It is owned by the State Highway Agency.