Nh 18 over Lafayette Brook
GoodGrafton County, New Hampshire · 2.7 MI from Sugar Hill Tl · Structure no. 008700890009900
- Built
- 1932
- 93 years old, rebuilt 2019
- Condition
- Good
- inspected April 2023
- Type
- Box Beam or Girders - Single or Spread
- Prestressed Concrete
- Length
- 56 ft
- 1 main span
- Daily traffic
- 593
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Nh 18 over Lafayette Brook is a prestressed concrete box beam or girders - single or spread carrying Nh 18 over Lafayette Brook in Grafton County, New Hampshire. It was built in 1932 and reconstructed in 2019, so it is 93 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 593 vehicles a day, roughly 10% of them trucks, projected to reach 877 by 2043. The structure is 56 ft (17.1 m) long and 29 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 | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Nh 18 over Lafayette Brook built?
It was built in 1932, making it 93 years old in 2025. It was reconstructed in 2019.
What condition is Nh 18 over Lafayette Brook 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 2023.
How much traffic does Nh 18 over Lafayette Brook carry?
About 593 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is Nh 18 over Lafayette Brook?
The structure is 56 ft (17.1 m) long with a longest span of 52 ft (15.8 m) and a deck 29 ft wide.
Who owns Nh 18 over Lafayette Brook?
It is owned by the State Highway Agency.