Dorchester Road over Grant Brook
PoorGrafton County, New Hampshire · 2.1 MI from JCT RTE 10 · Structure no. 015701020009900
- Built
- 1952
- 73 years old, rebuilt 1984
- Condition
- Poor
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 41 ft
- 1 main span
- Daily traffic
- 1,132
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Dorchester Road over Grant Brook is a steel stringer/multi-beam or girder carrying Dorchester Road over Grant Brook in Grafton County, New Hampshire. It was built in 1952 and reconstructed in 1984, so it is 73 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 1,132 vehicles a day, roughly 10% of them trucks, projected to reach 1,675 by 2043. The structure is 41 ft (12.5 m) long and 31 ft wide. If it were closed, the detour would be 6.8 mi (11 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 | 7 Good | Some minor problems. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Dorchester Road over Grant Brook built?
It was built in 1952, making it 73 years old in 2025. It was reconstructed in 1984.
What condition is Dorchester Road over Grant Brook 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 Dorchester Road over Grant Brook carry?
About 1,132 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is Dorchester Road over Grant Brook?
The structure is 41 ft (12.5 m) long with a longest span of 38 ft (11.6 m) and a deck 31 ft wide.
Who owns Dorchester Road over Grant Brook?
It is owned by the State Highway Agency.