Nh 11 over Blackwater River
GoodMerrimack County, New Hampshire · 0.7 MI from Wilmot T.L. · Structure no. 000800500009300
- Built
- 1959
- 66 years old, rebuilt 2013
- Condition
- Good
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 124 ft
- 2 main spans
- Daily traffic
- 5,615
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Nh 11 over Blackwater River is a steel stringer/multi-beam or girder carrying Nh 11 over Blackwater River in Merrimack County, New Hampshire. It was built in 1959 and reconstructed in 2013, so it is 66 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 5,615 vehicles a day, roughly 7% of them trucks, projected to reach 8,310 by 2043. The structure is 124 ft (37.8 m) long and 49 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 | 8 Very Good | No problems noted. |
| Superstructure | 9 Excellent | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| 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 Nh 11 over Blackwater River built?
It was built in 1959, making it 66 years old in 2025. It was reconstructed in 2013.
What condition is Nh 11 over Blackwater 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 May 2024.
How much traffic does Nh 11 over Blackwater River carry?
About 5,615 vehicles per day (2023 count), of which roughly 7% are trucks.
How long is Nh 11 over Blackwater River?
The structure is 124 ft (37.8 m) long with a longest span of 60 ft (18.3 m) and a deck 49 ft wide.
Who owns Nh 11 over Blackwater River?
It is owned by the State Highway Agency.