Tunnel Brook Road over Wild Ammonoosuc River
PoorGrafton County, New Hampshire · 0.6 MI N. Benton T.L. · Structure no. 007200840005600
- Built
- 1900
- 125 years old, rebuilt 1959
- Condition
- Poor
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 35 ft
- 1 main span
- Daily traffic
- 52
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Tunnel Brook Road over Wild Ammonoosuc River is a steel stringer/multi-beam or girder carrying Tunnel Brook Road over Wild Ammonoosuc River in Grafton County, New Hampshire. It was built in 1900 and reconstructed in 1959, so it is 125 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 52 vehicles a day, projected to reach 76 by 2043. The structure is 35 ft (10.7 m) long and 20 ft wide. If it were closed, the detour would be 21.1 mi (34 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| 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 Tunnel Brook Road over Wild Ammonoosuc River built?
It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1959.
What condition is Tunnel Brook Road over Wild Ammonoosuc River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.
How much traffic does Tunnel Brook Road over Wild Ammonoosuc River carry?
About 52 vehicles per day (2023 count).
How long is Tunnel Brook Road over Wild Ammonoosuc River?
The structure is 35 ft (10.7 m) long with a longest span of 32 ft (9.8 m) and a deck 20 ft wide.
Who owns Tunnel Brook Road over Wild Ammonoosuc River?
It is owned by the State Highway Agency.