Tirrell Hill Road over Black Brook
PoorHillsborough County, New Hampshire · 1.9MI FR Goffstwn Back RD · Structure no. 009501620014100
- Built
- 1994
- 31 years old
- Condition
- Poor
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 42 ft
- 1 main span
- Daily traffic
- 1,387
- 2023 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Tirrell Hill Road over Black Brook is a steel stringer/multi-beam or girder carrying Tirrell Hill Road over Black Brook in Hillsborough County, New Hampshire. It was built in 1994, so it is 31 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 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 1,387 vehicles a day, roughly 4% of them trucks, projected to reach 2,052 by 2043. The structure is 42 ft (12.8 m) long and 24 ft wide. 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 |
|---|---|---|
| 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Tirrell Hill Road over Black Brook built?
It was built in 1994, making it 31 years old in 2025.
What condition is Tirrell Hill Road over Black 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 October 2024.
How much traffic does Tirrell Hill Road over Black Brook carry?
About 1,387 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is Tirrell Hill Road over Black Brook?
The structure is 42 ft (12.8 m) long with a longest span of 37 ft (11.3 m) and a deck 24 ft wide.
Who owns Tirrell Hill Road over Black Brook?
It is owned by the City or Municipal Highway Agency.