N Dorchester Road over Rocky Brook
GoodGrafton County, New Hampshire · 1.8 MI Wentworth Tl · Structure no. 006401090015100
- Built
- 1975
- 50 years old
- Condition
- Good
- inspected September 2023
- Type
- Slab
- Concrete
- Length
- 30 ft
- 1 main span
- Daily traffic
- 45
- 2023 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
N Dorchester Road over Rocky Brook is a concrete slab carrying N Dorchester Road over Rocky Brook in Grafton County, New Hampshire. It was built in 1975, so it is 50 years old, younger 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 45 vehicles a day, roughly 4% of them trucks, projected to reach 66 by 2043. The structure is 30 ft (9.1 m) long and 32 ft wide. If it were closed, the detour would be 8.7 mi (14 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. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was N Dorchester Road over Rocky Brook built?
It was built in 1975, making it 50 years old in 2025.
What condition is N Dorchester Road over Rocky 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 September 2023.
How much traffic does N Dorchester Road over Rocky Brook carry?
About 45 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is N Dorchester Road over Rocky Brook?
The structure is 30 ft (9.1 m) long with a longest span of 25 ft (7.6 m) and a deck 32 ft wide.
Who owns N Dorchester Road over Rocky Brook?
It is owned by the City or Municipal Highway Agency.