Antrim Road over Monadnock Mill Canal
PoorHillsborough County, New Hampshire · 0.39 MI FR Contoocook Va · Structure no. 002100950009300
- Built
- 1922
- 103 years old
- Condition
- Poor
- inspected November 2024
- Type
- Tee Beam
- Concrete
- Length
- 28 ft
- 1 main span
- Daily traffic
- 2,233
- 2023 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Antrim Road over Monadnock Mill Canal is a concrete tee beam carrying Antrim Road over Monadnock Mill Canal in Hillsborough County, New Hampshire. It was built in 1922, so it is 103 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 2,233 vehicles a day, roughly 4% of them trucks, projected to reach 3,304 by 2043. The structure is 28 ft (8.5 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Antrim Road over Monadnock Mill Canal built?
It was built in 1922, making it 103 years old in 2025.
What condition is Antrim Road over Monadnock Mill Canal 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 Antrim Road over Monadnock Mill Canal carry?
About 2,233 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is Antrim Road over Monadnock Mill Canal?
The structure is 28 ft (8.5 m) long with a longest span of 22 ft (6.7 m) and a deck 32 ft wide.
Who owns Antrim Road over Monadnock Mill Canal?
It is owned by the City or Municipal Highway Agency.