Thorntons Ferry RD over Beaver Brook
PoorHillsborough County, New Hampshire · 3.2 MI FR Merrimack Tl · Structure no. 000701450010600
- Built
- 1970
- 55 years old
- Condition
- Poor
- inspected June 2024
- Type
- Culvert
- Steel
- Length
- 20 ft
- 2 main spans
- Daily traffic
- 356
- 2023 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Thorntons Ferry RD over Beaver Brook is a steel culvert carrying Thorntons Ferry RD over Beaver Brook in Hillsborough County, New Hampshire. It was built in 1970, so it is 55 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 poor condition with a lowest component rating of 1 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. Its operating status is: open, temporary structure in place while original is closed.
It carries about 356 vehicles a day, roughly 4% of them trucks, projected to reach 526 by 2043. The structure is 20 ft (6.1 m) long. If it were closed, the detour would be 3.1 mi (5 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 |
|---|---|---|
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Culvert | 1 Imminent Failure | Major deterioration or section loss present in critical structural components. Bridge is closed to traffic but corrective action may put it back in light service. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Thorntons Ferry RD over Beaver Brook built?
It was built in 1970, making it 55 years old in 2025.
What condition is Thorntons Ferry RD over Beaver 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 June 2024.
How much traffic does Thorntons Ferry RD over Beaver Brook carry?
About 356 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is Thorntons Ferry RD over Beaver Brook?
The structure is 20 ft (6.1 m) long with a longest span of 9 ft (2.7 m).
Who owns Thorntons Ferry RD over Beaver Brook?
It is owned by the City or Municipal Highway Agency.